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Financing Activities (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  |  | $ 35,771,200,000 |  |  |  |  |  |  |  | $ 35,771,200,000 |  |  |  | $ 33,779,400,000
Pollution Control Bonds |  |  | 1,770,400,000 |  |  |  |  |  |  |  | 1,770,400,000 |  |  |  | 1,771,600,000
Notes Payable |  |  | 644,300,000 |  |  |  |  |  |  |  | 644,300,000 |  |  |  | 193,300,000
Securitization Bonds |  |  | 285,700,000 |  |  |  |  |  |  |  | 285,700,000 |  |  |  | 368,900,000
Spent Nuclear Fuel Obligation | [1] |  | 312,700,000 |  |  |  |  |  |  |  | 312,700,000 |  |  |  | 300,400,000
Junior Subordinated Notes |  |  | 2,578,000,000 |  |  |  |  |  |  |  | 2,578,000,000 |  |  |  | 2,388,100,000
Other Long-term Debt |  |  | 612,100,000 |  |  |  |  |  |  |  | 612,100,000 |  |  |  | 1,341,500,000
Total Long-term Debt Outstanding |  |  | 41,974,400,000 |  |  |  |  |  |  |  | 41,974,400,000 |  |  |  | 40,143,200,000
Long-term Debt Due Within One Year |  |  | 2,826,700,000 |  |  |  |  |  |  |  | 2,826,700,000 |  |  |  | 2,490,500,000
Long-term Debt |  |  | 39,147,700,000 |  |  |  |  |  |  |  | 39,147,700,000 |  |  |  | 37,652,700,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | [2] |  |  |  |  |  |  |  |  |  | 3,786,400,000 |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | 1,969,100,000 |  | $ 1,353,300,000 |  |
Short-term Debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securitized Debt for Receivables | [3] |  | 900,000,000.0 |  |  |  |  |  |  |  | 900,000,000.0 |  |  |  | 888,000,000.0
Commercial Paper |  |  | 755,000,000.0 |  |  |  |  |  |  |  | 755,000,000.0 |  |  |  | 1,937,900,000
Total Short-term Debt |  |  | $ 1,659,600,000 |  |  |  |  |  |  |  | $ 1,659,600,000 |  |  |  | $ 2,830,200,000
Securitized Debt for Receivables | [3],[4] |  | 5.32% |  |  |  |  |  |  |  | 5.32% |  |  |  | 5.65%
Comparative Accounts Receivable Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective Interest Rates on Securitization of Accounts Receivable |  |  | 5.50% |  |  |  | 5.55% |  |  |  | 5.54% |  | 5.23% |  |
Net Uncollectible Accounts Receivable Written Off |  |  | $ 8,400,000 |  |  |  | $ 8,800,000 |  |  |  | $ 22,300,000 |  | $ 22,900,000 |  |
Customer Accounts Receivable Managed Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts |  |  | 1,285,400,000 |  |  |  |  |  |  |  | 1,285,400,000 |  |  |  | $ 1,207,400,000
Total Principal Outstanding |  |  | 900,000,000.0 |  |  |  |  |  |  |  | 900,000,000.0 |  |  |  | 888,000,000.0
Delinquent Securitized Accounts Receivable |  |  | 66,400,000 |  |  |  |  |  |  |  | 66,400,000 |  |  |  | 52,200,000
Bad Debt Reserves Related to Securitization, Sale of Accounts Receivable |  |  | 44,900,000 |  |  |  |  |  |  |  | 44,900,000 |  |  |  | 42,000,000.0
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable |  |  | 327,400,000 |  |  |  |  |  |  |  | 327,400,000 |  |  |  | $ 409,800,000
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 5,420,100,000 |  |  |  | 5,341,700,000 |  |  |  | 15,025,000,000 |  | 14,405,100,000 |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Value of Shares to be Issued Under ATM Program |  |  |  |  |  |  |  |  |  |  | $ 1,700,000,000 |  |  |  |
Maximum Percentage Paid to Selling Agents |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  |  |  |  | 4,437,136 |  |  |  |
Issuance of Common Stock |  |  |  |  |  |  |  |  |  |  | $ 513,000,000.0 |  | 959,300,000 |  |
Maximum Percentage Debt to Capitalization |  |  |  |  |  |  |  |  |  |  | 67.50% |  |  |  |
Total Commitment from Bank Conduits to Finance Receivables |  |  | 900,000,000 |  |  |  |  |  |  |  | $ 900,000,000 |  |  |  |
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30, |  |  | (2,500,000) |  | $ (1,100,000) | $ 14,800,000 | (6,700,000) |  | $ (3,300,000) | $ 12,500,000 |  |  |  |  |
Issuance of Long-term Debt |  |  |  |  |  |  |  |  |  |  | 3,748,500,000 |  | 4,017,800,000 |  |
Fixed Performance Obligations |  |  | 302,400,000 |  |  |  |  |  |  |  | 302,400,000 |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  |  | 23,100,000 |  |  |  |  |  |  |  | 23,100,000 |  |  |  |
2025-2026[Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  |  | 169,000,000.0 |  |  |  |  |  |  |  | 169,000,000.0 |  |  |  |
2027-2028 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  |  | 85,400,000 |  |  |  |  |  |  |  | 85,400,000 |  |  |  |
After 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  |  | 24,900,000 |  |  |  |  |  |  |  | 24,900,000 |  |  |  |
Reconciling Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Reconciling Adjustments [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold | [5] |  | (508,000,000.0) |  |  |  | (508,400,000) |  |  |  | (1,524,800,000) |  | (1,416,300,000) |  |
Vertically Integrated Utilities [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 54,200,000 |  |  |  | 47,300,000 |  |  |  | 147,900,000 |  | 134,300,000 |  |
Transmission And Distribution Utilities [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 6,900,000 |  |  |  | 8,900,000 |  |  |  | 21,000,000.0 |  | 27,200,000 |  |
Generation And Marketing [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 15,400,000 |  |  |  | 39,200,000 |  |  |  | 88,000,000.0 |  | 52,500,000 |  |
Other Operating Segment [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold | [6] |  | 32,100,000 |  |  |  | 30,300,000 |  |  |  | 100,500,000 |  | 83,900,000 |  |
Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 390,800,000 | [7] |  |  | 337,600,000 | [8] |  |  | 1,190,500,000 | [9] | 1,015,400,000 | [10] |
Wholesale Transmission [Member] | Reconciling Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | (439,400,000) | [7] |  |  | (425,100,000) | [8] |  |  | (1,255,000,000) | [9] | (1,229,700,000) | [10] |
Wholesale Transmission [Member] | AEP Transmission Holdco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 505,500,000 | [7] |  |  | 466,100,000 | [8] |  |  | 1,490,800,000 | [9] | 1,372,000,000 | [10] |
Wholesale Transmission [Member] | AEP Transmission Holdco [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 402,000,000 |  |  |  | 366,000,000 |  |  |  | 1,200,000,000 |  | 1,100,000,000 |  |
Wholesale Transmission [Member] | Vertically Integrated Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 129,600,000 | [7] |  |  | 120,600,000 | [8] |  |  | 371,500,000 | [9] | 348,800,000 | [10] |
Wholesale Transmission [Member] | Vertically Integrated Utilities [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 51,000,000 |  |  |  |  |  |  |  | 133,000,000 |  | 125,000,000 |  |
Wholesale Transmission [Member] | Transmission And Distribution Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 195,100,000 | [7] |  |  | 176,000,000.0 | [8] |  |  | 583,200,000 | [9] | 524,300,000 | [10] |
Wholesale Transmission [Member] | Generation And Marketing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 | [7] |  |  | 0 | [8] |  |  | 0 | [9] | 0 | [10] |
Wholesale Transmission [Member] | Other Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 | [7] |  |  | 0 | [8] |  |  | 0 | [9] | 0 | [10] |
Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 125,900,000 | [11] |  |  | 132,300,000 | [12] |  |  | 337,600,000 | [13] | 314,800,000 | [14] |
Other Revenues [Member] | Reconciling Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | (53,400,000) | [11] |  |  | (48,500,000) | [12] |  |  | (170,900,000) | [13] | (132,100,000) | [14] |
Other Revenues [Member] | AEP Transmission Holdco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 5,800,000 | [11] |  |  | 4,800,000 | [12] |  |  | 20,100,000 | [13] | 12,700,000 | [14] |
Other Revenues [Member] | Corporate Segment and Other Operating Segment | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 34,000,000 |  |  |  | 32,000,000 |  |  |  |  |  |  |  |
Other Revenues [Member] | Vertically Integrated Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 76,200,000 | [11] |  |  | 61,300,000 | [12] |  |  | 183,300,000 | [13] | 155,800,000 | [14] |
Other Revenues [Member] | Transmission And Distribution Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 58,900,000 | [11] |  |  | 58,200,000 | [12] |  |  | 148,800,000 | [13] | 157,100,000 | [14] |
Other Revenues [Member] | Generation And Marketing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 800,000 | [11] |  |  | 900,000 | [12] |  |  | 3,100,000 | [13] | 7,700,000 | [14] |
Other Revenues [Member] | Other Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 37,600,000 | [11] |  |  | 55,600,000 | [12] |  |  | 153,200,000 | [13] | 113,600,000 | [14] |
Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 228,000,000.0 |  |  |  | 205,800,000 |  |  |  | 664,000,000.0 |  | 582,100,000 |  |
Wholesale Generation [Member] | Reconciling Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 100,000 |  |  |  | (300,000) |  |  |  | 100,000 |  | (200,000) |  |
Wholesale Generation [Member] | AEP Transmission Holdco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Wholesale Generation [Member] | Vertically Integrated Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 202,500,000 |  |  |  | 174,300,000 |  |  |  | 587,400,000 |  | 498,500,000 |  |
Wholesale Generation [Member] | Transmission And Distribution Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Wholesale Generation [Member] | Generation And Marketing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 25,400,000 |  |  |  | 31,800,000 |  |  |  | 76,500,000 |  | 83,800,000 |  |
Wholesale Generation [Member] | Other Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 2,136,600,000 |  |  |  | 2,099,200,000 |  |  |  | 5,651,900,000 |  | 5,462,500,000 |  |
Residential [Member] | Reconciling Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Residential [Member] | AEP Transmission Holdco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Residential [Member] | Vertically Integrated Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 1,362,900,000 |  |  |  | 1,326,700,000 |  |  |  | 3,524,200,000 |  | 3,459,100,000 |  |
Residential [Member] | Transmission And Distribution Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 773,700,000 |  |  |  | 772,500,000 |  |  |  | 2,127,700,000 |  | 2,003,400,000 |  |
Residential [Member] | Generation And Marketing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Residential [Member] | Other Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Commercial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 1,172,600,000 |  |  |  | 1,141,000,000 |  |  |  | 3,255,600,000 |  | 3,151,300,000 |  |
Commercial [Member] | Reconciling Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Commercial [Member] | AEP Transmission Holdco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Commercial [Member] | Vertically Integrated Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 776,100,000 |  |  |  | 753,300,000 |  |  |  | 2,071,000,000 |  | 2,029,400,000 |  |
Commercial [Member] | Transmission And Distribution Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 396,500,000 |  |  |  | 387,700,000 |  |  |  | 1,184,600,000 |  | 1,121,900,000 |  |
Commercial [Member] | Generation And Marketing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Commercial [Member] | Other Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 816,000,000.0 | [15] |  |  | 838,500,000 |  |  |  | 2,374,700,000 | [16] | 2,572,400,000 | [17] |
Industrial [Member] | Reconciling Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | (300,000) | [15] |  |  | (300,000) |  |  |  | (600,000) | [16] | (600,000) | [17] |
Industrial [Member] | AEP Transmission Holdco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 | [15] |  |  | 0 |  |  |  | 0 | [16] | 0 | [17] |
Industrial [Member] | Vertically Integrated Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 692,600,000 | [15] |  |  | 699,900,000 |  |  |  | 1,992,500,000 | [16] | 2,069,100,000 | [17] |
Industrial [Member] | Transmission And Distribution Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 123,700,000 | [15] |  |  | 138,900,000 |  |  |  | 382,800,000 | [16] | 503,900,000 | [17] |
Industrial [Member] | Generation And Marketing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 | [15] |  |  | 0 |  |  |  | 0 | [16] | 0 | [17] |
Industrial [Member] | Other Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 | [15] |  |  | 0 |  |  |  | 0 | [16] | 0 | [17] |
Other Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 77,700,000 |  |  |  | 79,600,000 |  |  |  | 216,400,000 |  | 219,700,000 |  |
Other Retail [Member] | Reconciling Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Other Retail [Member] | AEP Transmission Holdco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Other Retail [Member] | Vertically Integrated Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 63,800,000 |  |  |  | 66,600,000 |  |  |  | 174,900,000 |  | 182,300,000 |  |
Other Retail [Member] | Transmission And Distribution Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 13,900,000 |  |  |  | 13,000,000.0 |  |  |  | 41,500,000 |  | 37,400,000 |  |
Other Retail [Member] | Generation And Marketing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Other Retail [Member] | Other Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 4,202,900,000 |  |  |  | 4,158,300,000 |  |  |  | 11,498,600,000 |  | 11,405,900,000 |  |
Retail [Member] | Reconciling Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | (300,000) |  |  |  | (300,000) |  |  |  | (600,000) |  | (600,000) |  |
Retail [Member] | AEP Transmission Holdco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Retail [Member] | Vertically Integrated Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 2,895,400,000 |  |  |  | 2,846,500,000 |  |  |  | 7,762,600,000 |  | 7,739,900,000 |  |
Retail [Member] | Transmission And Distribution Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 1,307,800,000 |  |  |  | 1,312,100,000 |  |  |  | 3,736,600,000 |  | 3,666,600,000 |  |
Retail [Member] | Generation And Marketing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Retail [Member] | Other Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
Renewable Generation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 7,200,000 | [15] |  |  | 17,300,000 | [18] |  |  | 18,900,000 | [16] | 68,500,000 | [17] |
Renewable Generation [Member] | Reconciling Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | (1,500,000) | [15] |  |  | (2,500,000) | [18] |  |  | (4,300,000) | [16] | (5,700,000) | [17] |
Renewable Generation [Member] | AEP Transmission Holdco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 | [15] |  |  | 0 | [18] |  |  | 0 | [16] | 0 | [17] |
Renewable Generation [Member] | Vertically Integrated Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 | [15] |  |  | 0 | [18] |  |  | 0 | [16] | 0 | [17] |
Renewable Generation [Member] | Transmission And Distribution Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 | [15] |  |  | 0 | [18] |  |  | 0 | [16] | 0 | [17] |
Renewable Generation [Member] | Generation And Marketing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 8,700,000 | [15] |  |  | 19,800,000 | [18] |  |  | 23,200,000 | [16] | 74,200,000 | [17] |
Renewable Generation [Member] | Other Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 | [15] |  |  | 0 | [18] |  |  | 0 | [16] | 0 | [17] |
Retail, Trading and Marketing Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 515,300,000 | [19] |  |  | 474,900,000 | [20] |  |  | 1,503,100,000 | [21] | 1,287,200,000 | [22] |
Retail, Trading and Marketing Revenues [Member] | Reconciling Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | (13,800,000) | [19] |  |  | (36,700,000) | [20] |  |  | (83,700,000) | [21] | (46,700,000) | [22] |
Retail, Trading and Marketing Revenues [Member] | AEP Transmission Holdco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 | [19] |  |  | 0 | [20] |  |  | 0 | [21] | 0 | [22] |
Retail, Trading and Marketing Revenues [Member] | Vertically Integrated Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 | [19] |  |  | 0 | [20] |  |  | 0 | [21] | 0 | [22] |
Retail, Trading and Marketing Revenues [Member] | Transmission And Distribution Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 | [19] |  |  | 0 | [20] |  |  | 0 | [21] | 0 | [22] |
Retail, Trading and Marketing Revenues [Member] | Generation And Marketing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 529,300,000 | [19] |  |  | 510,800,000 | [20] |  |  | 1,586,200,000 | [21] | 1,332,200,000 | [22] |
Retail, Trading and Marketing Revenues [Member] | Generation And Marketing [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 14,000,000 |  |  |  | 37,000,000 |  |  |  | 84,000,000 |  | 47,000,000 |  |
Retail, Trading and Marketing Revenues [Member] | Other Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | (200,000) | [19] |  |  | 800,000 | [20] |  |  | 600,000 | [21] | 1,700,000 | [22] |
Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 1,141,300,000 |  |  |  | 1,035,600,000 |  |  |  | 3,376,500,000 |  | 2,953,200,000 |  |
Wholesale and Competitive [Member] | Reconciling Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | (454,600,000) |  |  |  | (464,600,000) |  |  |  | (1,342,900,000) |  | (1,282,300,000) |  |
Wholesale and Competitive [Member] | AEP Transmission Holdco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 505,500,000 |  |  |  | 466,100,000 |  |  |  | 1,490,800,000 |  | 1,372,000,000 |  |
Wholesale and Competitive [Member] | Vertically Integrated Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 332,100,000 |  |  |  | 294,900,000 |  |  |  | 958,900,000 |  | 847,300,000 |  |
Wholesale and Competitive [Member] | Transmission And Distribution Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 195,100,000 |  |  |  | 176,000,000.0 |  |  |  | 583,200,000 |  | 524,300,000 |  |
Wholesale and Competitive [Member] | Generation And Marketing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 563,400,000 |  |  |  | 562,400,000 |  |  |  | 1,685,900,000 |  | 1,490,200,000 |  |
Wholesale and Competitive [Member] | Other Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | (200,000) |  |  |  | 800,000 |  |  |  | 600,000 |  | 1,700,000 |  |
Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 5,470,100,000 |  |  |  | 5,326,200,000 |  |  |  | 15,212,700,000 |  | 14,673,900,000 |  |
Affiliated and Nonaffiliated [Member] | Reconciling Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | (508,300,000) |  |  |  | (513,400,000) |  |  |  | (1,514,400,000) |  | (1,415,000,000) |  |
Affiliated and Nonaffiliated [Member] | AEP Transmission Holdco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 511,300,000 |  |  |  | 470,900,000 |  |  |  | 1,510,900,000 |  | 1,384,700,000 |  |
Affiliated and Nonaffiliated [Member] | Vertically Integrated Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 3,303,700,000 |  |  |  | 3,202,700,000 |  |  |  | 8,904,800,000 |  | 8,743,000,000 |  |
Affiliated and Nonaffiliated [Member] | Transmission And Distribution Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 1,561,800,000 |  |  |  | 1,546,300,000 |  |  |  | 4,468,600,000 |  | 4,348,000,000 |  |
Affiliated and Nonaffiliated [Member] | Generation And Marketing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 564,200,000 |  |  |  | 563,300,000 |  |  |  | 1,689,000,000 |  | 1,497,900,000 |  |
Affiliated and Nonaffiliated [Member] | Other Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 37,400,000 |  |  |  | 56,400,000 |  |  |  | 153,800,000 |  | 115,300,000 |  |
Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 119,100,000 |  |  |  | 120,900,000 |  |  |  | 380,400,000 |  | 307,800,000 |  |
Other Revenues [Member] | Corporate Segment and Other Operating Segment | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  | 112,000,000 |  | 87,000,000 |  |
Other Revenues [Member] | Other Operating Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold | [6] |  | $ 6,000,000.0 |  |  |  | 26,900,000 |  |  |  | 48,100,000 |  | 35,400,000 |  |
Equity Distribution Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Common Stock |  |  |  |  |  |  |  |  |  |  | 397,000,000 |  |  |  |
Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | [2] |  |  |  |  |  |  |  |  |  | $ 600,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2054 |  |  |  |
Interest Rate (Percentage) |  |  | 6.95% |  |  |  |  |  |  |  | 6.95% |  |  |  |
Junior Subordinates Notes Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | [2] |  |  |  |  |  |  |  |  |  | $ 400,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2054 |  |  |  |
Interest Rate (Percentage) |  |  | 7.05% |  |  |  |  |  |  |  | 7.05% |  |  |  |
Junior Subordinates Notes Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 805,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2024 |  |  |  |
Interest Rate (Percentage) |  |  | 2.03% |  |  |  |  |  |  |  | 2.03% |  |  |  |
Commercial Paper [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Interest Rate | [4] |  | 5.26% |  |  |  |  |  |  |  | 5.26% |  |  |  | 5.69%
AEP Texas Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt Outstanding |  |  | $ 6,479,400,000 |  |  |  |  |  |  |  | $ 6,479,400,000 |  |  |  | $ 5,889,800,000
Long-term Debt Due Within One Year |  |  | 113,900,000 |  |  |  |  |  |  |  | 113,900,000 |  |  |  | 96,000,000.0
Long-term Debt |  |  | 6,365,500,000 |  |  |  |  |  |  |  | 6,365,500,000 |  |  |  | 5,793,800,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 256,500,000 |  | 240,000,000.0 |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Percentage Debt to Capitalization |  |  |  |  |  |  |  |  |  |  | 67.50% |  |  |  |
Issuance of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 841,900,000 |  | 505,400,000 |  |
AEP Texas Inc. [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Short-Term Borrowings |  |  | 0 |  |  |  |  |  |  |  | 0 |  |  |  | (103,700,000)
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 1,300,000 |  |  |  | 1,200,000 |  |  |  | 4,000,000.0 |  | 3,700,000 |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Loans To Money Pool |  |  | 61,800,000 |  |  |  |  |  |  |  | 61,800,000 |  |  |  | 7,100,000
AEP Texas Inc. [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 170,600,000 | [23] |  |  | 154,600,000 | [24] |  |  | 511,300,000 | [25] | 464,000,000.0 | [26] |
AEP Texas Inc. [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 8,200,000 | [27] |  |  | 8,800,000 | [28] |  |  | 27,400,000 | [29] | 29,200,000 | [30] |
AEP Texas Inc. [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 | [31] |  |  | 0 | [32] |  |  | 0 | [33] | 0 | [34] |
AEP Texas Inc. [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 230,200,000 |  |  |  | 236,200,000 |  |  |  | 562,400,000 |  | 511,800,000 |  |
AEP Texas Inc. [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 120,300,000 |  |  |  | 112,400,000 |  |  |  | 346,200,000 |  | 310,300,000 |  |
AEP Texas Inc. [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 33,700,000 | [35] |  |  | 35,400,000 |  |  |  | 103,300,000 | [36] | 109,900,000 | [37] |
AEP Texas Inc. [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 9,700,000 |  |  |  | 9,200,000 |  |  |  | 28,700,000 |  | 26,200,000 |  |
AEP Texas Inc. [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 393,900,000 |  |  |  | 393,200,000 |  |  |  | 1,040,600,000 |  | 958,200,000 |  |
AEP Texas Inc. [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 170,600,000 |  |  |  | 154,600,000 |  |  |  | 511,300,000 |  | 464,000,000.0 |  |
AEP Texas Inc. [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 572,700,000 |  |  |  | 556,600,000 |  |  |  | 1,579,300,000 |  | 1,451,400,000 |  |
AEP Texas Inc. [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 700,000 |  |  |  | 1,800,000 |  |  |  | $ 3,300,000 |  | $ 2,900,000 |  |
AEP Texas Inc. [Member] | Utility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Interest Rate |  |  |  |  |  |  |  |  |  |  | 5.79% |  | 5.81% |  |
Minimum Interest Rate |  |  |  |  |  |  |  |  |  |  | 5.14% |  | 4.66% |  |
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | $ 374,600,000 |  |  |  |
Maximum Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 274,300,000 |  |  |  |
Average Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | 237,000,000.0 |  |  |  |
Average Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 203,100,000 |  |  |  |
Authorized Short Term Borrowing Limit |  |  |  |  |  |  |  |  |  |  | $ 600,000,000.0 |  |  |  |
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Borrowed |  |  |  |  |  |  |  |  |  |  | 5.69% |  | 5.44% |  |
Average Interest Rate For Funds Loaned |  |  |  |  |  |  |  |  |  |  | 5.48% |  | 5.70% |  |
AEP Texas Inc. [Member] | Utility [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Loans To Money Pool |  |  | 54,700,000 |  |  |  |  |  |  |  | $ 54,700,000 |  |  |  |
AEP Texas Inc. [Member] | Nonutility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 7,100,000 |  |  |  |
Average Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | $ 7,000,000.0 |  |  |  |
Maximum and Minimum Interest Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Interest Rate For Funds Loaned |  |  |  |  |  |  |  |  |  |  | 5.79% |  | 5.81% |  |
Minimum Interest Rate for Funds Loaned |  |  |  |  |  |  |  |  |  |  | 5.25% |  | 4.66% |  |
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Loaned |  |  |  |  |  |  |  |  |  |  | 5.64% |  | 5.47% |  |
AEP Texas Inc. [Member] | Nonutility [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Loans To Money Pool |  |  | $ 7,100,000 |  |  |  |  |  |  |  | $ 7,100,000 |  |  |  |
AEP Texas Inc. [Member] | Securitization Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 32,600,000 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2024 |  |  |  |
Interest Rate (Percentage) |  |  | 2.85% |  |  |  |  |  |  |  | 2.85% |  |  |  |
AEP Texas Inc. [Member] | Securitization Bonds Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 23,900,000 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2025 |  |  |  |
Interest Rate (Percentage) |  |  | 2.06% |  |  |  |  |  |  |  | 2.06% |  |  |  |
AEP Texas Inc. [Member] | Senior Unsecured Notes Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | [2] |  |  |  |  |  |  |  |  |  | $ 500,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2029 |  |  |  |
Interest Rate (Percentage) |  |  | 5.45% |  |  |  |  |  |  |  | 5.45% |  |  |  |
AEP Texas Inc. [Member] | OtherLongTermDebtThree |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 200,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2025 |  |  |  |
Interest Rate (Variable) |  |  |  |  |  |  |  |  |  |  | Variable |  |  |  |
AEP Texas Inc. [Member] | Senior Unsecured Notes Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | [2] |  |  |  |  |  |  |  |  |  | $ 350,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2034 |  |  |  |
Interest Rate (Percentage) |  |  | 5.70% |  |  |  |  |  |  |  | 5.70% |  |  |  |
AEP Transmission Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt Outstanding |  |  | $ 5,862,300,000 |  |  |  |  |  |  |  | $ 5,862,300,000 |  |  |  | 5,414,400,000
Long-term Debt Due Within One Year |  |  | 185,000,000.0 |  |  |  |  |  |  |  | 185,000,000.0 |  |  |  | 95,000,000.0
Long-term Debt |  |  | 5,677,300,000 |  |  |  |  |  |  |  | 5,677,300,000 |  |  |  | 5,319,400,000
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sub-Limit of Secured Debt |  |  | $ 50,000,000 |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |
Maximum Percentage of Consolidated Tangible Net Assets |  |  | 10.00% |  |  |  |  |  |  |  | 10.00% |  |  |  |
Tangible Capital to Tangible Assets |  |  | 0.30% |  |  |  |  |  |  |  | 0.30% |  |  |  |
Maximum Percentage Debt to Capitalization |  |  |  |  |  |  |  |  |  |  | 67.50% |  |  |  |
Issuance of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 445,700,000 |  | $ 689,000,000.0 |  |
AEP Transmission Co [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Short-Term Borrowings |  |  | $ (42,800,000) |  |  |  |  |  |  |  | (42,800,000) |  |  |  | (174,300,000)
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 404,400,000 |  |  |  | 374,700,000 |  |  |  | 1,188,200,000 |  | 1,097,900,000 |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Loans To Money Pool |  |  | 181,800,000 |  |  |  |  |  |  |  | 181,800,000 |  |  |  | 67,100,000
AEP Transmission Co [Member] | Reconciling Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
AEP Transmission Co [Member] | Reconciling Adjustments [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
AEP Transmission Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 491,900,000 | [23] |  |  | 454,700,000 | [24] |  |  | 1,450,500,000 | [25] | 1,338,100,000 | [26] |
AEP Transmission Co [Member] | Wholesale Transmission [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 399,000,000 |  |  |  | 363,000,000 |  |  |  | 1,200,000,000 |  | 1,100,000,000 |  |
AEP Transmission Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 6,000,000.0 | [27] |  |  | 5,000,000.0 | [28] |  |  | 20,300,000 | [29] | 12,800,000 | [30] |
AEP Transmission Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 | [31] |  |  | 0 | [32] |  |  | 0 | [33] | 0 | [34] |
AEP Transmission Co [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
AEP Transmission Co [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
AEP Transmission Co [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 | [35] |  |  | 0 |  |  |  | 0 | [36] | 0 | [37] |
AEP Transmission Co [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
AEP Transmission Co [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |
AEP Transmission Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 491,900,000 |  |  |  | 454,700,000 |  |  |  | 1,450,500,000 |  | 1,338,100,000 |  |
AEP Transmission Co [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 497,900,000 |  |  |  | 459,700,000 |  |  |  | 1,470,800,000 |  | 1,350,900,000 |  |
AEP Transmission Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 200,000 |  |  |  | 0 |  |  |  | 3,000,000.0 |  | $ 0 |  |
AEP Transmission Co [Member] | Other Revenues [Member] | Reconciling Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 |  |  |  |  |  |  |  | $ 0 |  |  |  |
AEP Transmission Co [Member] | Utility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Interest Rate |  |  |  |  |  |  |  |  |  |  | 5.79% |  | 5.81% |  |
Minimum Interest Rate |  |  |  |  |  |  |  |  |  |  | 5.14% |  | 4.66% |  |
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | $ 313,300,000 |  |  |  |
Maximum Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 332,000,000.0 |  |  |  |
Average Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | 75,700,000 |  |  |  |
Average Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 159,200,000 |  |  |  |
Authorized Short Term Borrowing Limit | [38] |  |  |  |  |  |  |  |  |  | $ 820,000,000.0 |  |  |  |
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Borrowed |  |  |  |  |  |  |  |  |  |  | 5.68% |  | 5.29% |  |
Average Interest Rate For Funds Loaned |  |  |  |  |  |  |  |  |  |  | 5.58% |  | 5.52% |  |
AEP Transmission Co [Member] | Utility [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Loans To Money Pool |  |  | 152,600,000 |  |  |  |  |  |  |  | $ 152,600,000 |  |  |  |
AEP Transmission Co [Member] | Direct Borrowing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | 49,400,000 |  |  |  |
Maximum Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 148,500,000 |  |  |  |
Average Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | 15,300,000 |  |  |  |
Average Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 69,800,000 |  |  |  |
Borrowings from Parent |  |  | 11,800,000 |  |  |  |  |  |  |  | 11,800,000 |  |  |  |
Loans to Parent |  |  | $ 0 |  |  |  |  |  |  |  | 0 |  |  |  |
Authorized Short Term Borrowing Limit | [39] |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Maximum and Minimum Interest Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Interest Rate for Funds Borrowed |  |  |  |  |  |  |  |  |  |  | 5.79% |  | 5.81% |  |
Minimum Interest Rate For Funds Borrowed |  |  |  |  |  |  |  |  |  |  | 5.25% |  | 4.53% |  |
Maximum Interest Rate For Funds Loaned |  |  |  |  |  |  |  |  |  |  | 5.79% |  | 5.81% |  |
Minimum Interest Rate for Funds Loaned |  |  |  |  |  |  |  |  |  |  | 5.25% |  | 4.53% |  |
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Borrowed |  |  |  |  |  |  |  |  |  |  | 5.66% |  | 5.43% |  |
Average Interest Rate For Funds Loaned |  |  |  |  |  |  |  |  |  |  | 5.63% |  | 5.46% |  |
AEP Transmission Co [Member] | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | [2] |  |  |  |  |  |  |  |  |  | $ 450,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2034 |  |  |  |
Interest Rate (Percentage) |  |  | 5.15% |  |  |  |  |  |  |  | 5.15% |  |  |  |
Appalachian Power Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt Outstanding |  |  | $ 5,659,200,000 |  |  |  |  |  |  |  | $ 5,659,200,000 |  |  |  | 5,588,300,000
Long-term Debt Due Within One Year |  |  | 748,600,000 |  |  |  |  |  |  |  | 748,600,000 |  |  |  | 538,800,000
Long-term Debt |  |  | 4,910,600,000 |  |  |  |  |  |  |  | 4,910,600,000 |  |  |  | 5,049,500,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | 413,500,000 |  | $ 26,500,000 |  |
Accounts Receivable and Accrued Unbilled Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable and Accrued Unbilled Revenues |  |  | 178,500,000 |  |  |  |  |  |  |  | 178,500,000 |  |  |  | 184,600,000
Proceeds from Sale of Receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Receivables to AEP Credit |  |  | 504,600,000 |  |  |  | 451,600,000 |  |  |  | $ 1,487,900,000 |  | 1,372,700,000 |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Percentage Debt to Capitalization |  |  |  |  |  |  |  |  |  |  | 67.50% |  |  |  |
Issuance of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 480,800,000 |  | 200,000,000.0 |  |
Fixed Performance Obligations |  |  | 74,200,000 |  |  |  |  |  |  |  | 74,200,000 |  |  |  |
Appalachian Power Co [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Short-Term Borrowings |  |  | (900,000) |  |  |  |  |  |  |  | (900,000) |  |  |  | (339,600,000)
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 65,200,000 |  |  |  | 62,500,000 |  |  |  | 183,100,000 |  | 193,200,000 |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Loans To Money Pool |  |  | 18,900,000 |  |  |  |  |  |  |  | 18,900,000 |  |  |  | 18,900,000
Appalachian Power Co [Member] | 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  |  | 4,000,000.0 |  |  |  |  |  |  |  | 4,000,000.0 |  |  |  |
Appalachian Power Co [Member] | 2025-2026[Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  |  | 32,100,000 |  |  |  |  |  |  |  | 32,100,000 |  |  |  |
Appalachian Power Co [Member] | 2027-2028 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  |  | 26,500,000 |  |  |  |  |  |  |  | 26,500,000 |  |  |  |
Appalachian Power Co [Member] | After 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  |  | 11,600,000 |  |  |  |  |  |  |  | 11,600,000 |  |  |  |
Appalachian Power Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 45,600,000 | [23] |  |  | 45,500,000 | [24] |  |  | 138,300,000 | [25] | 130,800,000 | [26] |
Appalachian Power Co [Member] | Wholesale Transmission [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 22,000,000 |  |  |  | 22,000,000 |  |  |  | 65,000,000 |  | 64,000,000 |  |
Appalachian Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 36,200,000 | [27] |  |  | 35,200,000 | [28] |  |  | 71,000,000.0 | [29] | 60,000,000.0 | [30] |
Appalachian Power Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 78,700,000 | [31] |  |  | 79,400,000 | [32] |  |  | 235,900,000 | [33] | 223,800,000 | [34] |
Appalachian Power Co [Member] | Wholesale Generation [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 41,000,000 |  |  |  | 36,000,000 |  |  |  | 118,000,000 |  | 121,000,000 |  |
Appalachian Power Co [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 442,600,000 |  |  |  | 397,100,000 |  |  |  | 1,333,700,000 |  | 1,192,400,000 |  |
Appalachian Power Co [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 196,400,000 |  |  |  | 181,300,000 |  |  |  | 571,800,000 |  | 516,200,000 |  |
Appalachian Power Co [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 201,200,000 | [35] |  |  | 197,100,000 |  |  |  | 603,500,000 | [36] | 575,400,000 | [37] |
Appalachian Power Co [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 28,100,000 |  |  |  | 26,800,000 |  |  |  | 84,300,000 |  | 78,200,000 |  |
Appalachian Power Co [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 868,300,000 |  |  |  | 802,300,000 |  |  |  | 2,593,300,000 |  | 2,362,200,000 |  |
Appalachian Power Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 124,300,000 |  |  |  | 124,900,000 |  |  |  | 374,200,000 |  | 354,600,000 |  |
Appalachian Power Co [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 1,028,800,000 |  |  |  | 962,400,000 |  |  |  | 3,038,500,000 |  | 2,776,800,000 |  |
Appalachian Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 3,100,000 |  |  |  | 3,300,000 |  |  |  | 12,400,000 |  | 9,800,000 |  |
Appalachian Power Co [Member] | Servicing Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 4,000,000.0 |  |  |  | 4,100,000 |  |  |  | $ 12,100,000 |  | $ 13,300,000 |  |
Appalachian Power Co [Member] | Utility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Interest Rate |  |  |  |  |  |  |  |  |  |  | 5.79% |  | 5.81% |  |
Minimum Interest Rate |  |  |  |  |  |  |  |  |  |  | 5.14% |  | 4.66% |  |
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | $ 399,500,000 |  |  |  |
Maximum Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 132,300,000 |  |  |  |
Average Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | 110,200,000 |  |  |  |
Average Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 32,600,000 |  |  |  |
Authorized Short Term Borrowing Limit |  |  |  |  |  |  |  |  |  |  | $ 750,000,000.0 |  |  |  |
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Borrowed |  |  |  |  |  |  |  |  |  |  | 5.72% |  | 5.47% |  |
Average Interest Rate For Funds Loaned |  |  |  |  |  |  |  |  |  |  | 5.51% |  | 5.47% |  |
Appalachian Power Co [Member] | Utility [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Loans To Money Pool |  |  | $ 18,000,000.0 |  |  |  |  |  |  |  | $ 18,000,000.0 |  |  |  |
Appalachian Power Co [Member] | Pollution Control Bond [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | [2] |  |  |  |  |  |  |  |  |  | $ 86,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2028 |  |  |  |
Interest Rate (Percentage) |  |  | 3.38% |  |  |  |  |  |  |  | 3.38% |  |  |  |
Appalachian Power Co [Member] | OtherLongTermDebtFour |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 300,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2024 |  |  |  |
Interest Rate (Variable) |  |  |  |  |  |  |  |  |  |  | Variable |  |  |  |
Appalachian Power Co [Member] | Pollution Control Bond Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 86,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2024 |  |  |  |
Interest Rate (Percentage) |  |  | 2.55% |  |  |  |  |  |  |  | 2.55% |  |  |  |
Appalachian Power Co [Member] | Other Long Term Debt Five |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2026 |  |  |  |
Interest Rate (Percentage) |  |  | 13.72% |  |  |  |  |  |  |  | 13.72% |  |  |  |
Appalachian Power Co [Member] | Securitization Bonds Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 27,400,000 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2028 |  |  |  |
Interest Rate (Percentage) |  |  | 3.77% |  |  |  |  |  |  |  | 3.77% |  |  |  |
Appalachian Power Co [Member] | Senior Unsecured Notes Four |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | [2] |  |  |  |  |  |  |  |  |  | $ 400,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2034 |  |  |  |
Interest Rate (Percentage) |  |  | 5.65% |  |  |  |  |  |  |  | 5.65% |  |  |  |
Indiana Michigan Power Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt Outstanding |  |  | $ 3,517,500,000 |  |  |  |  |  |  |  | $ 3,517,500,000 |  |  |  | 3,499,400,000
Long-term Debt Due Within One Year |  |  | 284,100,000 |  |  |  |  |  |  |  | 284,100,000 |  |  |  | 83,700,000
Long-term Debt |  |  | 3,233,400,000 |  |  |  |  |  |  |  | 3,233,400,000 |  |  |  | 3,415,700,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | 76,100,000 |  | $ 324,100,000 |  |
Accounts Receivable and Accrued Unbilled Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable and Accrued Unbilled Revenues |  |  | 183,600,000 |  |  |  |  |  |  |  | 183,600,000 |  |  |  | 156,400,000
Proceeds from Sale of Receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Receivables to AEP Credit |  |  | 576,700,000 |  |  |  | 553,300,000 |  |  |  | 1,608,500,000 |  | 1,575,900,000 |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition |  |  | 366,000,000 |  |  |  |  |  |  |  | $ 366,000,000 |  |  |  | 348,000,000
Maximum Percentage Debt to Capitalization |  |  |  |  |  |  |  |  |  |  | 67.50% |  |  |  |
Issuance of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 80,400,000 |  | 494,800,000 |  |
Fixed Performance Obligations |  |  | 23,200,000 |  |  |  |  |  |  |  | 23,200,000 |  |  |  |
Indiana Michigan Power Co [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Short-Term Borrowings |  |  | (77,000,000.0) |  |  |  |  |  |  |  | (77,000,000.0) |  |  |  | (63,300,000)
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 1,300,000 |  |  |  | 600,000 |  |  |  | 5,200,000 |  | 3,700,000 |  |
Indiana Michigan Power Co [Member] | 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  |  | 1,100,000 |  |  |  |  |  |  |  | 1,100,000 |  |  |  |
Indiana Michigan Power Co [Member] | 2025-2026[Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  |  | 8,800,000 |  |  |  |  |  |  |  | 8,800,000 |  |  |  |
Indiana Michigan Power Co [Member] | 2027-2028 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  |  | 8,800,000 |  |  |  |  |  |  |  | 8,800,000 |  |  |  |
Indiana Michigan Power Co [Member] | After 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  |  | 4,500,000 |  |  |  |  |  |  |  | 4,500,000 |  |  |  |
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 10,400,000 | [23] |  |  | 10,400,000 | [24] |  |  | 30,500,000 | [25] | 28,100,000 | [26] |
Indiana Michigan Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 35,300,000 | [27] |  |  | 26,200,000 | [28] |  |  | 92,300,000 | [29] | 92,600,000 | [30] |
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 18,000,000 |  |  |  | 18,000,000 |  |  |  | 59,000,000 |  | 52,000,000 |  |
Indiana Michigan Power Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 113,500,000 | [31] |  |  | 90,200,000 | [32] |  |  | 305,600,000 | [33] | 257,700,000 | [34] |
Indiana Michigan Power Co [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 249,400,000 |  |  |  | 230,700,000 |  |  |  | 664,700,000 |  | 655,500,000 |  |
Indiana Michigan Power Co [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 169,900,000 |  |  |  | 159,200,000 |  |  |  | 465,500,000 |  | 439,500,000 |  |
Indiana Michigan Power Co [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 155,400,000 | [35] |  |  | 159,100,000 |  |  |  | 456,400,000 | [36] | 467,600,000 | [37] |
Indiana Michigan Power Co [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 1,200,000 |  |  |  | 1,300,000 |  |  |  | 3,800,000 |  | 3,800,000 |  |
Indiana Michigan Power Co [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 575,900,000 |  |  |  | 550,300,000 |  |  |  | 1,590,400,000 |  | 1,566,400,000 |  |
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 123,900,000 |  |  |  | 100,600,000 |  |  |  | 336,100,000 |  | 285,800,000 |  |
Indiana Michigan Power Co [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 735,100,000 |  |  |  | 677,100,000 |  |  |  | 2,018,800,000 |  | 1,944,800,000 |  |
Indiana Michigan Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 2,100,000 |  |  |  | 4,200,000 |  |  |  | 7,000,000.0 |  | 9,700,000 |  |
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | $ 15,200,000 |  |  |  | 15,400,000 |  |  |  | 50,700,000 |  | 45,800,000 |  |
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 7,400,000 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2025 |  |  |  |
Interest Rate (Percentage) |  |  | 0.93% |  |  |  |  |  |  |  | 0.93% |  |  |  |
Indiana Michigan Power Co [Member] | Servicing Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | $ 4,100,000 |  |  |  | 4,400,000 |  |  |  | $ 12,000,000.0 |  | $ 12,200,000 |  |
Indiana Michigan Power Co [Member] | Utility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Interest Rate |  |  |  |  |  |  |  |  |  |  | 5.79% |  | 5.81% |  |
Minimum Interest Rate |  |  |  |  |  |  |  |  |  |  | 5.14% |  | 4.66% |  |
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | $ 126,900,000 |  |  |  |
Maximum Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 8,400,000 |  |  |  |
Average Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | 53,300,000 |  |  |  |
Average Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 3,900,000 |  |  |  |
Authorized Short Term Borrowing Limit |  |  |  |  |  |  |  |  |  |  | $ 500,000,000.0 |  |  |  |
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Borrowed |  |  |  |  |  |  |  |  |  |  | 5.64% |  | 5.13% |  |
Average Interest Rate For Funds Loaned |  |  |  |  |  |  |  |  |  |  | 5.44% |  | 5.54% |  |
Indiana Michigan Power Co [Member] | Utility [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Short-Term Borrowings |  |  | $ (77,000,000.0) |  |  |  |  |  |  |  | $ (77,000,000.0) |  |  |  |
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Five [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 2,900,000 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2025 |  |  |  |
Interest Rate (Variable) |  |  |  |  |  |  |  |  |  |  | Variable |  |  |  |
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Six [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 15,200,000 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2026 |  |  |  |
Interest Rate (Percentage) |  |  | 3.44% |  |  |  |  |  |  |  | 3.44% |  |  |  |
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Seven [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 15,100,000 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2027 |  |  |  |
Interest Rate (Percentage) |  |  | 5.93% |  |  |  |  |  |  |  | 5.93% |  |  |  |
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Eight [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 20,600,000 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2028 |  |  |  |
Interest Rate (Percentage) |  |  | 6.01% |  |  |  |  |  |  |  | 6.01% |  |  |  |
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Nine |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 11,400,000 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2028 |  |  |  |
Interest Rate (Percentage) |  |  | 6.41% |  |  |  |  |  |  |  | 6.41% |  |  |  |
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | [2] |  |  |  |  |  |  |  |  |  | $ 80,400,000 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2028 |  |  |  |
Interest Rate (Percentage) |  |  | 6.41% |  |  |  |  |  |  |  | 6.41% |  |  |  |
Indiana Michigan Power Co [Member] | Other Long Term Debt Six |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 1,800,000 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2025 |  |  |  |
Interest Rate (Percentage) |  |  | 6.00% |  |  |  |  |  |  |  | 6.00% |  |  |  |
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 1,700,000 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2024 |  |  |  |
Interest Rate (Variable) |  |  |  |  |  |  |  |  |  |  | Variable |  |  |  |
Indiana Michigan Power Co [Member] | Notes Payable, Other Payable Twelve | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  | $ 9,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Ohio Power Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt Outstanding |  |  | $ 3,715,000,000 |  |  |  |  |  |  |  | $ 3,715,000,000 |  |  |  | 3,366,800,000
Long-term Debt |  |  | 3,715,000,000 |  |  |  |  |  |  |  | 3,715,000,000 |  |  |  | 3,366,800,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | 0 |  | $ 600,000 |  |
Accounts Receivable and Accrued Unbilled Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable and Accrued Unbilled Revenues |  |  | 517,200,000 |  |  |  |  |  |  |  | 517,200,000 |  |  |  | 541,700,000
Proceeds from Sale of Receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Receivables to AEP Credit |  |  | 860,000,000.0 |  |  |  | 850,300,000 |  |  |  | 2,477,200,000 |  | 2,518,600,000 |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Long-term Debt |  |  |  |  |  |  |  |  |  |  | 346,300,000 |  | 395,000,000.0 |  |
Ohio Power Co [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Short-Term Borrowings |  |  | 0 |  |  |  |  |  |  |  | 0 |  |  |  | (110,500,000)
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 5,600,000 |  |  |  | 7,800,000 |  |  |  | 17,000,000.0 |  | 23,600,000 |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Loans To Money Pool |  |  | 97,400,000 |  |  |  |  |  |  |  | 97,400,000 |  |  |  | 0
Ohio Power Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 24,500,000 | [23] |  |  | 21,400,000 | [24] |  |  | 71,900,000 | [25] | 60,300,000 | [26] |
Ohio Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 50,800,000 | [27] |  |  | 49,200,000 | [28] |  |  | 121,500,000 | [29] | 127,900,000 | [30] |
Ohio Power Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 0 | [31] |  |  | 0 | [32] |  |  | 0 | [33] | 0 | [34] |
Ohio Power Co [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 543,400,000 |  |  |  | 536,300,000 |  |  |  | 1,565,200,000 |  | 1,491,600,000 |  |
Ohio Power Co [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 276,200,000 |  |  |  | 275,300,000 |  |  |  | 838,400,000 |  | 811,600,000 |  |
Ohio Power Co [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 89,900,000 | [35] |  |  | 103,600,000 |  |  |  | 279,400,000 | [36] | 394,000,000.0 | [37] |
Ohio Power Co [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 4,200,000 |  |  |  | 3,800,000 |  |  |  | 12,900,000 |  | 11,200,000 |  |
Ohio Power Co [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 913,700,000 |  |  |  | 919,000,000.0 |  |  |  | 2,695,900,000 |  | 2,708,400,000 |  |
Ohio Power Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 24,500,000 |  |  |  | 21,400,000 |  |  |  | 71,900,000 |  | 60,300,000 |  |
Ohio Power Co [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 989,000,000.0 |  |  |  | 989,600,000 |  |  |  | 2,889,300,000 |  | 2,896,600,000 |  |
Ohio Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 2,800,000 |  |  |  | 3,000,000.0 |  |  |  | 8,300,000 |  | 10,300,000 |  |
Ohio Power Co [Member] | Servicing Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 7,500,000 |  |  |  | 7,400,000 |  |  |  | $ 22,300,000 |  | $ 22,300,000 |  |
Ohio Power Co [Member] | Utility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Interest Rate |  |  |  |  |  |  |  |  |  |  | 5.79% |  | 5.81% |  |
Minimum Interest Rate |  |  |  |  |  |  |  |  |  |  | 5.14% |  | 4.66% |  |
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | $ 310,000,000.0 |  |  |  |
Maximum Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 159,900,000 |  |  |  |
Average Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | 180,500,000 |  |  |  |
Average Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 75,900,000 |  |  |  |
Authorized Short Term Borrowing Limit |  |  |  |  |  |  |  |  |  |  | $ 600,000,000.0 |  |  |  |
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Borrowed |  |  |  |  |  |  |  |  |  |  | 5.70% |  | 5.37% |  |
Average Interest Rate For Funds Loaned |  |  |  |  |  |  |  |  |  |  | 5.49% |  | 5.60% |  |
Ohio Power Co [Member] | Utility [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Loans To Money Pool |  |  | $ 97,400,000 |  |  |  |  |  |  |  | $ 97,400,000 |  |  |  |
Ohio Power Co [Member] | Senior Unsecured Notes Five |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | [2] |  |  |  |  |  |  |  |  |  | $ 350,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2034 |  |  |  |
Interest Rate (Percentage) |  |  | 5.65% |  |  |  |  |  |  |  | 5.65% |  |  |  |
Public Service Co Of Oklahoma [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt Outstanding |  |  | $ 2,385,400,000 |  |  |  |  |  |  |  | $ 2,385,400,000 |  |  |  | 2,384,600,000
Long-term Debt Due Within One Year |  |  | 250,600,000 |  |  |  |  |  |  |  | 250,600,000 |  |  |  | 600,000
Long-term Debt |  |  | 2,134,800,000 |  |  |  |  |  |  |  | 2,134,800,000 |  |  |  | 2,384,000,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | 400,000 |  | $ 400,000 |  |
Accounts Receivable and Accrued Unbilled Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable and Accrued Unbilled Revenues |  |  | 192,200,000 |  |  |  |  |  |  |  | 192,200,000 |  |  |  | 134,600,000
Proceeds from Sale of Receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Receivables to AEP Credit |  |  | 611,500,000 |  |  |  | 633,800,000 |  |  |  | $ 1,398,100,000 |  | 1,510,300,000 |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Percentage Debt to Capitalization |  |  |  |  |  |  |  |  |  |  | 67.50% |  |  |  |
Issuance of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 0 |  | 469,800,000 |  |
Public Service Co Of Oklahoma [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Short-Term Borrowings |  |  | (98,500,000) |  |  |  |  |  |  |  | (98,500,000) |  |  |  | (54,400,000)
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 1,100,000 |  |  |  | 200,000 |  |  |  | 5,700,000 |  | 1,000,000.0 |  |
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 12,000,000.0 | [23] |  |  | 10,800,000 | [24] |  |  | 33,000,000.0 | [25] | 32,000,000.0 | [26] |
Public Service Co Of Oklahoma [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 6,000,000.0 | [27] |  |  | 5,400,000 | [28] |  |  | 30,400,000 | [29] | 14,900,000 | [30] |
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 2,100,000 | [31] |  |  | (4,900,000) | [32] |  |  | 7,000,000.0 | [33] | 300,000 | [34] |
Public Service Co Of Oklahoma [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 301,100,000 |  |  |  | 310,500,000 |  |  |  | 647,100,000 |  | 667,900,000 |  |
Public Service Co Of Oklahoma [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 165,100,000 |  |  |  | 171,900,000 |  |  |  | 398,200,000 |  | 412,700,000 |  |
Public Service Co Of Oklahoma [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 98,500,000 | [35] |  |  | 114,100,000 |  |  |  | 269,900,000 | [36] | 320,200,000 | [37] |
Public Service Co Of Oklahoma [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 30,800,000 |  |  |  | 33,800,000 |  |  |  | 78,200,000 |  | 86,300,000 |  |
Public Service Co Of Oklahoma [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 595,500,000 |  |  |  | 630,300,000 |  |  |  | 1,393,400,000 |  | 1,487,100,000 |  |
Public Service Co Of Oklahoma [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 14,100,000 |  |  |  | 5,900,000 |  |  |  | 40,000,000.0 |  | 32,300,000 |  |
Public Service Co Of Oklahoma [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 615,600,000 |  |  |  | 641,600,000 |  |  |  | 1,463,800,000 |  | 1,534,300,000 |  |
Public Service Co Of Oklahoma [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 1,400,000 |  |  |  | 1,400,000 |  |  |  | 17,200,000 |  | 5,100,000 |  |
Public Service Co Of Oklahoma [Member] | Servicing Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 4,100,000 |  |  |  | 4,600,000 |  |  |  | $ 10,900,000 |  | $ 11,300,000 |  |
Public Service Co Of Oklahoma [Member] | Utility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Interest Rate |  |  |  |  |  |  |  |  |  |  | 5.79% |  | 5.81% |  |
Minimum Interest Rate |  |  |  |  |  |  |  |  |  |  | 5.14% |  | 4.66% |  |
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | $ 302,200,000 |  |  |  |
Maximum Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Average Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | 184,000,000.0 |  |  |  |
Average Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Authorized Short Term Borrowing Limit |  |  |  |  |  |  |  |  |  |  | $ 750,000,000.0 |  |  |  |
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Borrowed |  |  |  |  |  |  |  |  |  |  | 5.59% |  | 5.48% |  |
Average Interest Rate For Funds Loaned |  |  |  |  |  |  |  |  |  |  | 0.00% |  | 5.24% |  |
Public Service Co Of Oklahoma [Member] | Utility [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Short-Term Borrowings |  |  | $ (98,500,000) |  |  |  |  |  |  |  | $ (98,500,000) |  |  |  |
Public Service Co Of Oklahoma [Member] | Other Long Term Debt Seven |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 400,000 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2027 |  |  |  |
Interest Rate (Percentage) |  |  | 3.00% |  |  |  |  |  |  |  | 3.00% |  |  |  |
Southwestern Electric Power Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt Outstanding |  |  | $ 3,648,700,000 |  |  |  |  |  |  |  | $ 3,648,700,000 |  |  |  | 3,646,900,000
Long-term Debt |  |  | 3,648,700,000 |  |  |  |  |  |  |  | 3,648,700,000 |  |  |  | 3,646,900,000
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | 0 |  | $ 94,100,000 |  |
Short-term Debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable |  |  | 4,600,000 |  |  |  |  |  |  |  | 4,600,000 |  |  |  | 4,300,000
Accounts Receivable and Accrued Unbilled Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable and Accrued Unbilled Revenues |  |  | 189,200,000 |  |  |  |  |  |  |  | 189,200,000 |  |  |  | 168,300,000
Proceeds from Sale of Receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Receivables to AEP Credit |  |  | 531,400,000 |  |  |  | 558,400,000 |  |  |  | $ 1,428,700,000 |  | 1,456,500,000 |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Percentage Debt to Capitalization |  |  |  |  |  |  |  |  |  |  | 67.50% |  |  |  |
Issuance of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 0 |  | 346,800,000 |  |
Southwestern Electric Power Co [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Short-Term Borrowings |  |  | (237,400,000) |  |  |  |  |  |  |  | (237,400,000) |  |  |  | (88,700,000)
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 21,900,000 |  |  |  | 14,400,000 |  |  |  | 52,300,000 |  | 45,700,000 |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Loans To Money Pool |  |  | 2,800,000 |  |  |  |  |  |  |  | 2,800,000 |  |  |  | $ 2,200,000
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 50,000,000.0 | [23] |  |  | 42,400,000 | [24] |  |  | 136,300,000 | [25] | 123,600,000 | [26] |
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 22,000,000 |  |  |  | 17,000,000 |  |  |  | 50,000,000 |  | 43,000,000 |  |
Southwestern Electric Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 8,800,000 | [27] |  |  | 6,000,000.0 | [28] |  |  | 26,000,000.0 | [29] | 20,900,000 | [30] |
Southwestern Electric Power Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 42,700,000 | [31] |  |  | 36,800,000 | [32] |  |  | 139,900,000 | [33] | 120,300,000 | [34] |
Southwestern Electric Power Co [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 260,100,000 |  |  |  | 286,500,000 |  |  |  | 563,200,000 |  | 647,500,000 |  |
Southwestern Electric Power Co [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 172,500,000 |  |  |  | 174,900,000 |  |  |  | 413,200,000 |  | 472,200,000 |  |
Southwestern Electric Power Co [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 102,500,000 | [35] |  |  | 105,500,000 |  |  |  | 269,800,000 | [36] | 320,300,000 | [37] |
Southwestern Electric Power Co [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 2,300,000 |  |  |  | 2,400,000 |  |  |  | 6,600,000 |  | 7,600,000 |  |
Southwestern Electric Power Co [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 537,400,000 |  |  |  | 569,300,000 |  |  |  | 1,252,800,000 |  | 1,447,600,000 |  |
Southwestern Electric Power Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 92,700,000 |  |  |  | 79,200,000 |  |  |  | 276,200,000 |  | 243,900,000 |  |
Southwestern Electric Power Co [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 638,900,000 |  |  |  | 654,500,000 |  |  |  | 1,555,000,000 |  | 1,712,400,000 |  |
Southwestern Electric Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 700,000 |  |  |  | 500,000 |  |  |  | 7,000,000.0 |  | 1,800,000 |  |
Southwestern Electric Power Co [Member] | Servicing Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  | 4,400,000 |  |  |  | 5,200,000 |  |  |  | $ 13,500,000 |  | $ 13,900,000 |  |
Southwestern Electric Power Co [Member] | Utility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Interest Rate |  |  |  |  |  |  |  |  |  |  | 5.79% |  | 5.81% |  |
Minimum Interest Rate |  |  |  |  |  |  |  |  |  |  | 5.14% |  | 4.66% |  |
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | $ 362,200,000 |  |  |  |
Maximum Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Average Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | 243,200,000 |  |  |  |
Average Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Authorized Short Term Borrowing Limit |  |  |  |  |  |  |  |  |  |  | $ 750,000,000.0 |  |  |  |
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Borrowed |  |  |  |  |  |  |  |  |  |  | 5.58% |  | 5.25% |  |
Average Interest Rate For Funds Loaned |  |  |  |  |  |  |  |  |  |  | 0.00% |  | 5.72% |  |
Southwestern Electric Power Co [Member] | Utility [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Short-Term Borrowings |  |  | (237,400,000) |  |  |  |  |  |  |  | $ (237,400,000) |  |  |  |
Southwestern Electric Power Co [Member] | Nonutility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 2,800,000 |  |  |  |
Average Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | $ 2,600,000 |  |  |  |
Maximum and Minimum Interest Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Interest Rate For Funds Loaned |  |  |  |  |  |  |  |  |  |  | 5.79% |  | 5.81% |  |
Minimum Interest Rate for Funds Loaned |  |  |  |  |  |  |  |  |  |  | 5.25% |  | 4.66% |  |
Average Interest Rates for Funds Borrowed From and Loaned to Money Pool |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Loaned |  |  |  |  |  |  |  |  |  |  | 5.64% |  | 5.49% |  |
Southwestern Electric Power Co [Member] | Nonutility [Member] | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Loans To Money Pool |  |  | $ 2,800,000 |  |  |  |  |  |  |  | $ 2,800,000 |  |  |  |
Southwestern Electric Power Co [Member] | Loans Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Interest Rate | [4] |  | 7.20% |  |  |  |  |  |  |  | 7.20% |  |  |  | 7.71%
Transource Energy [Member] | Other Long Term Debt Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | [2] |  |  |  |  |  |  |  |  |  | $ 50,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2025 |  |  |  |
Interest Rate (Variable) |  |  |  |  |  |  |  |  |  |  | Variable |  |  |  |
Transource Energy [Member] | Other Long Term Debt Nine | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Due Date |  | 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate (Variable) |  | variable |  |  |  |  |  |  |  |  |  |  |  |  |
Transource Energy [Member] | Senior Unsecured Notes Seven |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2050 |  |  |  |
Interest Rate (Percentage) |  |  | 2.75% |  |  |  |  |  |  |  | 2.75% |  |  |  |
Transource Energy [Member] | Senior Unsecured Notes Eight |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2050 |  |  |  |
Interest Rate (Percentage) |  |  | 2.75% |  |  |  |  |  |  |  | 2.75% |  |  |  |
Kentucky Power Co [Member] | Senior Unsecured Notes Six |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 65,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2024 |  |  |  |
Interest Rate (Percentage) |  |  | 3.13% |  |  |  |  |  |  |  | 3.13% |  |  |  |
Wheeling Power Company | Notes Payable, Other Payable Eleven |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 265,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2024 |  |  |  |
Interest Rate (Variable) |  |  |  |  |  |  |  |  |  |  | Variable |  |  |  |
Wheeling Power Company | Notes Payable, Other Payable Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | [2] |  |  |  |  |  |  |  |  |  | $ 450,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2034 |  |  |  |
Interest Rate (Percentage) |  |  | 6.89% |  |  |  |  |  |  |  | 6.89% |  |  |  |
AEP Generating Company | Other Long Term Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | [2] |  |  |  |  |  |  |  |  |  | $ 70,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2025 |  |  |  |
Interest Rate (Variable) |  |  |  |  |  |  |  |  |  |  | Variable |  |  |  |
AEP Generating Company | Notes Payable, Other Payable Ten |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 5,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2028 |  |  |  |
Interest Rate (Percentage) |  |  | 2.43% |  |  |  |  |  |  |  | 2.43% |  |  |  |
AEP Generating Company | Other Long Term Debt Eight |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt and Other Securities Issued, Retired and Principal Payments Made |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  |  |  |  |  |  | $ 80,000,000.0 |  |  |  |
Due Date |  |  |  |  |  |  |  |  |  |  | 2024 |  |  |  |
Interest Rate (Variable) |  |  |  |  |  |  |  |  |  |  | Variable |  |  |  |
AEP Southwestern Transmission Co | Direct Borrowing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money Pool Participants Money Pool Activity And Authorized Borrowing Limits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | $ 1,900,000 |  |  |  |
Maximum Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Average Borrowings from Money Pool |  |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |  |
Average Loans to Money Pool |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Borrowings from Parent |  |  | $ 1,800,000 |  |  |  |  |  |  |  | 1,800,000 |  |  |  |
Loans to Parent |  |  | 0 |  |  |  |  |  |  |  | 0 |  |  |  |
Authorized Short Term Borrowing Limit | [39] |  |  |  |  |  |  |  |  |  | $ 50,000,000.0 |  |  |  |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward Equity Purchase Contract Included in Current and Noncurrent Liabilities as of September 30, |  |  | $ (2,500,000) |  | $ (1,100,000) | $ 14,800,000 | $ (6,700,000) |  | $ (3,300,000) | $ 12,700,000 |  |  |  |  |
[1] | Pursuant to the Nuclear Waste Policy Act of 1982, I&M, a nuclear licensee, has an obligation to the United States Department of Energy for SNF disposal. The obligation includes a one-time fee for nuclear fuel consumed prior to April 7, 1983. Trust fund assets related to this obligation were $366 million and $348 million as of September 30, 2024 and December 31, 2023, respectively, and are included in Spent Nuclear Fuel and Decommissioning Trusts on the balance sheets.
[2] | Amounts indicated on the statements of cash flows are net of issuance costs and premium or discount and will not tie to the issuance amounts.
[3] | Amount of securitized debt for receivables as accounted for under the “Transfers and Servicing” accounting guidance.
[4] | Weighted-average rate as of September 30, 2024 and December 31, 2023, respectively.
[5] | Represents inter-segment revenues.
[6] | Corporate and Other primarily includes the purchasing of receivables from certain AEP utility subsidiaries. This segment also includes Parent’s guarantee revenue received from affiliates, investment income, interest income and interest expense, income tax expense and other nonallocated costs.
[7] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $402 million. The affiliated revenue for Vertically Integrated Utilities was $51 million. The remaining affiliated amounts were immaterial.
[8] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $366 million. The remaining affiliated amounts were immaterial.
[9] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1.2 billion. The affiliated revenue for Vertically Integrated Utilities was $133 million. The remaining affiliated amounts were immaterial.
[10] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1.1 billion. The affiliated revenue for Vertically Integrated Utilities was $125 million. The remaining affiliated amounts were immaterial.
[11] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $34 million. The remaining affiliated amounts were immaterial.
[12] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $32 million. The remaining affiliated amounts were immaterial.
[13] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $112 million. The remaining affiliated amounts were immaterial.
[14] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $87 million. The remaining affiliated amounts were immaterial.
[15] | Amounts include affiliated and nonaffiliated revenues.
[16] | Amounts include affiliated and nonaffiliated revenues.
[17] | Amounts include affiliated and nonaffiliated revenues
[18] | Amounts include affiliated and nonaffiliated revenues
[19] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $14 million. The remaining affiliated amounts were immaterial.
[20] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $37 million. The remaining affiliated amounts were immaterial.
[21] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $84 million. The remaining affiliated amounts were immaterial.
[22] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $47 million. The remaining affiliated amounts were immaterial.
[23] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $399 million, APCo was $22 million and SWEPCo was $22 million. The remaining affiliated amounts were immaterial.
[24] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $363 million, APCo was $22 million and SWEPCo was $17 million. The remaining affiliated amounts were immaterial.
[25] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $1.2 billion, APCo was $65 million and SWEPCo was $50 million. The remaining affiliated amounts were immaterial.
[26] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $1.1 billion, APCo was $64 million and SWEPCo was $43 million. The remaining affiliated amounts were immaterial.
[27] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $18 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.
[28] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $18 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.
[29] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $59 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.
[30] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $52 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.
[31] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $41 million primarily related to the PPA with KGPCo.
[32] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $36 million primarily related to the PPA with KGPCo.
[33] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $118 million primarily related to the PPA with KGPCo. The remaining affiliated amounts were immaterial.
[34] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $121 million primarily related to the PPA with KGPCo. The remaining affiliated amounts were immaterial.
[35] | Amounts include affiliated and nonaffiliated revenues.
[36] | Amounts include affiliated and nonaffiliated revenues.
[37] | Amounts include affiliated and nonaffiliated revenues.
[38] | (a) Amount represents the combined authorized short-term borrowing limit the State Transcos have from FERC or state regulatory commissions.
[39] | (a) Amount represents the authorized short-term borrowing limit from FERC or state regulatory agencies not otherwise included in the utility money pool above.

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