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v3.23.1

Financing Activities (Details) - USD ($) | 1 Months Ended | 12 Months Ended
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Feb. 23, 2023 | Jan. 31, 2023 | Jan. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Shares of Company |  |  |  |  |  |  |  |  |
Beginning Balance, Shares |  |  | 525,099,321 | 524,416,175 | 524,416,175 | 516,808,354 |  | 514,373,631 |
Issued |  |  |  |  | 683,146 | 7,607,821 |  | 2,434,723 |
Ending Balance, Shares |  |  |  |  | 525,099,321 | 524,416,175 |  | 516,808,354 |
Treasury Stock, Shares, Beginning Balance |  |  | 11,233,240 | 20,204,160 | 20,204,160 | 20,204,160 |  | 20,204,160 |
Partners' Capital Account, Units, Treasury Units Reissued | [1] |  |  |  | 8,970,920 |  |  |  |
Treasury Stock, Shares, Ending Balance |  |  |  |  | 11,233,240 | 20,204,160 |  | 20,204,160 |
Long-term Debt |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  |  |  |  | $ 30,174,800,000 | $ 28,185,700,000 |  |  |
Pollution Control Bonds | [2] |  |  |  | 1,770,200,000 | 1,869,300,000 |  |  |
Notes Payable | [3] |  |  |  | 269,700,000 | 211,300,000 |  |  |
Securitization Bonds |  |  |  |  | 487,800,000 | 603,500,000 |  |  |
Spent Nuclear Fuel Obligation | [4] |  |  |  | 285,600,000 | 281,300,000 |  |  |
Junior Subordinated Notes | [5] |  |  |  | 2,381,300,000 | 2,373,000,000 |  |  |
Other Long-term Debt |  |  |  |  | 1,431,600,000 | 1,033,500,000 |  |  |
Total Long-term Debt Outstanding |  |  |  |  | 36,801,000,000 | 34,557,600,000 |  |  |
Outstanding Long-term Debt |  |  |  |  |  |  |  |  |
Principal Amount, 2023 |  |  |  |  | 2,486,400,000 |  |  |  |
Principal Amount, 2024 | [6] |  |  |  | 1,590,200,000 |  |  |  |
Principal Amount, 2025 | [7] |  |  |  | 3,253,900,000 |  |  |  |
Principal Amount, 2026 |  |  |  |  | 1,754,000,000 |  |  |  |
Principal Amount, 2027 |  |  |  |  | 2,251,900,000 |  |  |  |
Principal Amount, After 2027 |  |  |  |  | 25,773,800,000 |  |  |  |
Principal Amount, Total |  |  |  |  | 37,110,200,000 |  |  |  |
Unamortized Discount, Net and Debt Issuance Costs |  |  |  |  | (309,200,000) |  |  |  |
Total Long-term Debt Outstanding |  |  |  |  | 36,801,000,000 | 34,557,600,000 |  |  |
Short-term Debt |  |  |  |  |  |  |  |  |
Securitized Debt for Receivables | [8] |  |  |  | 750,000,000.0 | 750,000,000.0 |  |  |
Commercial Paper |  |  |  |  | 2,862,200,000 | 1,364,000,000 |  |  |
Total Short-term Debt |  |  |  |  | $ 4,112,200,000 | $ 2,614,000,000 |  |  |
Securitized Debt for Receivables | [8],[9] |  |  |  | 4.67% | 0.19% |  |  |
Comparative Accounts Receivable Information |  |  |  |  |  |  |  |  |
Effective Interest Rates on Securitization of Accounts Receivable |  |  |  |  | 1.84% | 0.19% |  | 0.85% |
Net Uncollectible Accounts Receivable Written Off |  |  |  |  | $ 29,500,000 | $ 26,500,000 |  | $ 15,300,000 |
Customer Accounts Receivable Managed Portfolio |  |  |  |  |  |  |  |  |
Accounts Receivable Retained Interest and Pledged as Collateral Less Uncollectible Accounts |  |  |  |  | 1,167,700,000 |  |  |  |
Total Principal Outstanding |  |  |  |  | 750,000,000.0 | 750,000,000.0 |  |  |
Delinquent Securitized Accounts Receivable |  |  |  |  | 44,200,000 | 57,900,000 |  |  |
Bad Debt Reserves Related to Securitized Sale of Accounts Receivable |  |  |  |  | 39,700,000 | 42,800,000 |  |  |
Unbilled Receivables Related to Securitization, Sale of Accounts Receivable |  |  |  |  | 360,900,000 | 307,100,000 |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  | 19,639,500,000 | 16,792,000,000 |  | 14,918,500,000 |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  | 2,345,400,000 | 2,989,300,000 |  | 1,339,800,000 |
Proceeds from Issuance of Long-term Debt |  |  |  |  | 4,649,700,000 | 6,486,300,000 |  | 5,626,100,000 |
Forward Equity Purchase Contracts Included in Current and Noncurrent Liabilities as of December 31, |  |  |  |  | $ 56,400,000 | 47,800,000 |  | (86,200,000) |
Maximum Percentage Debt to Capitalization |  |  |  |  | 67.50% |  |  |  |
Restricted Net Assets |  |  |  |  | $ 16,200,000,000 |  |  |  |
Dividend Restrictions | [10] |  |  |  | 3,023,000,000 |  |  |  |
Retained Earnings Available to Pay Dividends |  |  |  |  | 8,100,000,000 |  |  |  |
Dividends Paid on Common Stock |  |  |  |  | (1,645,200,000) | (1,519,500,000) |  | (1,424,900,000) |
Credit Facilities, Total |  |  |  |  | 5,000,000,000 |  |  |  |
Maximum Value of Shares to be Issued Under ATM Program |  |  |  |  | $ 1,000,000,000 |  |  |  |
Maximum Percentage Paid to Selling Agents |  |  |  |  | 2.00% |  |  |  |
Issuance of Common Stock, Net |  |  |  |  | $ 826,500,000 | 600,500,000 |  | 155,000,000.0 |
Commitment From Bank Conduits to Finance Receivables (One) [Domain] |  |  |  |  | 125,000,000 |  |  |  |
Commitment from Bank Conduits to Finance Receivables Two |  |  |  |  | 625,000,000 |  |  |  |
Total Commitment From Bank Conduits To Finance Receivables |  |  |  |  | $ 750,000,000 |  |  |  |
2019 Equity Units [Member] |  |  |  |  |  |  |  |  |
Shares of Company |  |  |  |  |  |  |  |  |
Issued |  |  |  |  | 8,970,920 |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Equity Units Issued |  |  |  |  | 16,100,000 |  |  |  |
Per Unit Conversion for Equity Units |  |  |  |  | $ 50 |  |  |  |
Net Equity Units Issuance Proceeds |  |  |  |  | 785,000,000 |  |  |  |
Principal Amounts of Junior Subordinated Debt |  |  |  |  | $ 1,000 |  |  |  |
Forward Equity Purchase Contract Date |  |  |  |  | 2022 |  |  |  |
Corporate unit ownership share of an equity unit |  |  |  |  | 5.00% |  |  |  |
Issuance of Common Stock, Net |  |  |  |  | $ 805,000,000 |  |  |  |
2020 Equity Units [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Equity Units Issued |  |  |  |  | 17,000,000 |  |  |  |
Per Unit Conversion for Equity Units |  |  |  |  | $ 50 |  |  |  |
Net Equity Units Issuance Proceeds |  |  |  |  | 833,000,000 |  |  |  |
Principal Amounts of Junior Subordinated Debt |  |  |  |  | $ 1,000 |  |  |  |
Forward Equity Purchase Contract Date |  |  |  |  | 2023 |  |  |  |
Equity Units Annual Distribution Rate |  |  |  |  | 6.125% |  |  |  |
Forward Equity Contract Payment Rate |  |  |  |  | 4.825% |  |  |  |
Forward Equity Purchase Contracts Included in Current and Noncurrent Liabilities as of December 31, |  |  |  |  | $ 0 | $ 0 |  | 110,600,000 |
Maximum Shares Issued Under Equity Units Conversion |  |  |  |  | 10,205,100 |  |  |  |
Corporate unit ownership share of an equity unit |  |  |  |  | 5.00% |  |  |  |
Minimum [Member] | 2020 Equity Units [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
AEP Share Price for Equity Unit Conversion |  |  |  |  | $ 83.29 |  |  |  |
Shares Per Equity Unit |  |  |  |  | 0.5003 |  |  |  |
Maximum [Member] | 2020 Equity Units [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
AEP Share Price for Equity Unit Conversion |  |  |  |  | $ 99.95 |  |  |  |
Shares Per Equity Unit |  |  |  |  | 0.6003 |  |  |  |
Commercial Paper [Member] |  |  |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate | [9] |  |  |  | 4.80% | 0.34% |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Weighted Average Interest Rate of Commercial Paper Outstanding During Year |  |  |  |  | 2.74% |  |  |  |
Maximum Amount of Commercial Paper Outstanding |  |  |  |  | $ 2,900,000,000 |  |  |  |
364 Day Term Loan |  |  |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate | [9] |  |  |  | 0.00% | 0.81% |  |  |
Other Short-term Borrowings |  |  |  |  | $ 0 | $ 500,000,000.0 |  |  |
Term Loan 1 |  |  |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate | [9] |  |  |  | 5.17% | 0.00% |  |  |
Other Short-term Borrowings |  |  |  |  | $ 125,000,000.0 | $ 0 |  |  |
Term Loan 2 |  |  |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate | [9] |  |  |  | 5.17% | 0.00% |  |  |
Other Short-term Borrowings |  |  |  |  | $ 150,000,000.0 | $ 0 |  |  |
Term Loan 3 |  |  |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate | [9] |  |  |  | 5.23% | 0.00% |  |  |
Other Short-term Borrowings |  |  |  |  | $ 100,000,000.0 | $ 0 |  |  |
Term Loan 4 |  |  |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate | [9] |  |  |  | 4.87% | 0.00% |  |  |
Other Short-term Borrowings |  |  |  |  | $ 125,000,000.0 | $ 0 |  |  |
Securitized Debt |  |  |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  |  |  |  |
Securitized Debt for Receivables |  |  |  |  | $ 750,000,000 |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Weighted Average Interest Rate of Commercial Paper Outstanding During Year |  |  |  |  | 1.84% |  |  |  |
AEP Texas Inc. [Member] |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  |  |  |  | $ 4,702,700,000 | 4,135,500,000 |  |  |
Pollution Control Bonds |  |  |  |  | 440,200,000 | 439,900,000 |  |  |
Securitization Bonds |  |  |  |  | 314,400,000 | 404,700,000 |  |  |
Other Long-term Debt |  |  |  |  | 200,500,000 | 200,700,000 |  |  |
Total Long-term Debt Outstanding |  |  |  |  | 5,657,800,000 | 5,180,800,000 |  |  |
Outstanding Long-term Debt |  |  |  |  |  |  |  |  |
Principal Amount, 2023 |  |  |  |  | 278,500,000 |  |  |  |
Principal Amount, 2024 |  |  |  |  | 96,000,000.0 |  |  |  |
Principal Amount, 2025 |  |  |  |  | 524,500,000 |  |  |  |
Principal Amount, 2026 |  |  |  |  | 75,000,000.0 |  |  |  |
Principal Amount, 2027 |  |  |  |  | 25,600,000 |  |  |  |
Principal Amount, After 2027 |  |  |  |  | 4,706,400,000 |  |  |  |
Principal Amount, Total |  |  |  |  | 5,706,000,000 |  |  |  |
Unamortized Discount, Net and Debt Issuance Costs |  |  |  |  | (48,200,000) |  |  |  |
Total Long-term Debt Outstanding |  |  |  |  | 5,657,800,000 | 5,180,800,000 |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  | 1,848,000,000 | 1,587,700,000 |  | 1,528,000,000 |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  | 716,000,000.0 | 88,700,000 |  | 392,100,000 |
Proceeds from Issuance of Long-term Debt |  |  |  |  | $ 1,188,600,000 | 444,200,000 |  | $ 652,700,000 |
Maximum Percentage Debt to Capitalization |  |  |  |  | 67.50% |  |  |  |
Dividend Restrictions |  |  |  |  | $ 1,105,700,000 |  |  |  |
AEP Texas Inc. [Member] | Utility [Member] |  |  |  |  |  |  |  |  |
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits |  |  |  |  |  |  |  |  |
Maximum Borrowings from Money Pool |  |  |  |  | 348,800,000 | 355,500,000 |  |  |
Maximum Loans to Money Pool |  |  |  |  | 652,300,000 | 104,700,000 |  |  |
Average Borrowings from Money Pool |  |  |  |  | 173,300,000 | 172,500,000 |  |  |
Average Loans to Money Pool |  |  |  |  | 247,800,000 | 40,000,000.0 |  |  |
Net Loans (Borrowings) to/from Money Pool |  |  |  |  | (96,500,000) | (26,900,000) |  |  |
Authorized Short Term Borrowing Limit |  |  |  |  | $ 500,000,000.0 | $ 500,000,000.0 |  |  |
Maximum and Minimum Interest Rates |  |  |  |  |  |  |  |  |
Maximum Interest Rate |  |  |  |  | 5.28% | 0.48% |  | 2.70% |
Minimum Interest Rate |  |  |  |  | 0.10% | 0.02% |  | 0.27% |
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Borrowed |  |  |  |  | 1.08% | 0.33% |  | 1.51% |
Average Interest Rate For Funds Loaned |  |  |  |  | 1.99% | 0.26% |  | 0.81% |
AEP Texas Inc. [Member] | Utility [Member] | Nonutility [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Interest Expense, Related Party |  |  |  |  | $ 900,000 | $ 300,000 |  | $ 800,000 |
Interest Income Earned on Advances to the Money Pool |  |  |  |  | $ 2,600,000 | $ 100,000 |  | $ 700,000 |
AEP Texas Inc. [Member] | Nonutility [Member] |  |  |  |  |  |  |  |  |
Maximum Interest Rate For Funds Loaned |  |  |  |  | 5.28% | 0.58% |  | 2.70% |
Minimum Interest Rate for Funds Loaned |  |  |  |  | 0.46% | 0.21% |  | 0.27% |
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits |  |  |  |  |  |  |  |  |
Maximum Loans to Money Pool |  |  |  |  | $ 7,000,000.0 | $ 7,100,000 |  |  |
Average Loans to Money Pool |  |  |  |  | 6,800,000 | 6,900,000 |  |  |
Net Loans (Borrowings) to/from Money Pool |  |  |  |  | $ 6,900,000 | $ 6,900,000 |  |  |
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Loaned |  |  |  |  | 2.23% | 0.37% |  | 1.18% |
AEP Transmission Co [Member] |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  |  |  |  | $ 4,782,800,000 | $ 4,343,900,000 |  |  |
Total Long-term Debt Outstanding |  |  |  |  | 4,782,800,000 | 4,343,900,000 |  |  |
Outstanding Long-term Debt |  |  |  |  |  |  |  |  |
Principal Amount, 2023 |  |  |  |  | 60,000,000.0 |  |  |  |
Principal Amount, 2024 |  |  |  |  | 95,000,000.0 |  |  |  |
Principal Amount, 2025 |  |  |  |  | 90,000,000.0 |  |  |  |
Principal Amount, 2026 |  |  |  |  | 425,000,000.0 |  |  |  |
Principal Amount, 2027 |  |  |  |  | 0 |  |  |  |
Principal Amount, After 2027 |  |  |  |  | 4,166,000,000 |  |  |  |
Principal Amount, Total |  |  |  |  | 4,836,000,000 |  |  |  |
Unamortized Discount, Net and Debt Issuance Costs |  |  |  |  | (53,200,000) |  |  |  |
Total Long-term Debt Outstanding |  |  |  |  | 4,782,800,000 | 4,343,900,000 |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  | 1,651,700,000 | 1,410,900,000 |  | $ 1,232,700,000 |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  | 104,000,000.0 | 50,000,000.0 |  | 0 |
Proceeds from Issuance of Long-term Debt |  |  |  |  | 540,800,000 | 443,700,000 |  | $ 519,500,000 |
Sub-Limit of Secured Debt |  |  |  |  | $ 50,000,000 |  |  |  |
Maximum Percentage of Consolidated Tangible Net Assets |  |  |  |  | 10.00% |  |  |  |
Tangible Capital to Tangible Assets |  |  |  |  | 0.019 |  |  |  |
Maximum Percentage Debt to Capitalization |  |  |  |  | 67.50% |  |  |  |
Dividend Restrictions |  |  |  |  | $ 0 |  |  |  |
AEP Transmission Co [Member] | Utility [Member] |  |  |  |  |  |  |  |  |
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits |  |  |  |  |  |  |  |  |
Maximum Borrowings from Money Pool |  |  |  |  | 480,200,000 | 444,900,000 |  |  |
Maximum Loans to Money Pool |  |  |  |  | 137,000,000.0 | 117,300,000 |  |  |
Average Borrowings from Money Pool |  |  |  |  | 189,400,000 | 189,100,000 |  |  |
Average Loans to Money Pool |  |  |  |  | 28,900,000 | 29,700,000 |  |  |
Net Loans (Borrowings) to/from Money Pool |  |  |  |  | (195,500,000) | (108,800,000) |  |  |
Authorized Short Term Borrowing Limit | [11] |  |  |  | $ 820,000,000.0 | $ 820,000,000.0 |  |  |
Maximum and Minimum Interest Rates |  |  |  |  |  |  |  |  |
Maximum Interest Rate |  |  |  |  | 5.28% | 0.48% |  | 2.70% |
Minimum Interest Rate |  |  |  |  | 0.10% | 0.02% |  | 0.27% |
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Borrowed |  |  |  |  | 1.81% | 0.32% |  | 1.29% |
Average Interest Rate For Funds Loaned |  |  |  |  | 2.47% | 0.10% |  | 1.99% |
AEP Transmission Co [Member] | Utility [Member] | Direct Borrowing [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Interest Expense, Related Party |  |  |  |  | $ 3,500,000 | $ 600,000 |  | $ 1,500,000 |
Interest Income Earned on Advances to the Money Pool |  |  |  |  | $ 1,600,000 | $ 400,000 |  | $ 2,400,000 |
AEP Transmission Co [Member] | Direct Borrowing [Member] |  |  |  |  |  |  |  |  |
Maximum Interest Rate for Funds Borrowed |  |  |  |  | 5.28% | 0.86% |  | 2.70% |
Minimum Interest Rate For Funds Borrowed |  |  |  |  | 0.46% | 0.25% |  | 0.27% |
Maximum Interest Rate For Funds Loaned |  |  |  |  | 5.28% | 0.86% |  | 2.70% |
Minimum Interest Rate for Funds Loaned |  |  |  |  | 0.46% | 0.25% |  | 0.27% |
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits |  |  |  |  |  |  |  |  |
Maximum Borrowings from Money Pool |  |  |  |  | $ 52,400,000 | $ 14,600,000 |  |  |
Maximum Loans to Money Pool |  |  |  |  | 141,800,000 | 224,200,000 |  |  |
Average Borrowings from Money Pool |  |  |  |  | 6,700,000 | 1,800,000 |  |  |
Average Loans to Money Pool |  |  |  |  | 57,500,000 | 118,000,000.0 |  |  |
Borrowings from Parent |  |  |  |  | 29,400,000 | 1,500,000 |  |  |
Loans to Parent |  |  |  |  | 0 | 12,700,000 |  |  |
Authorized Short Term Borrowing Limit | [12] |  |  |  | $ 50,000,000.0 | $ 50,000,000.0 |  |  |
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Borrowed |  |  |  |  | 2.08% | 0.38% |  | 1.20% |
Average Interest Rate For Funds Loaned |  |  |  |  | 2.07% | 0.35% |  | 1.13% |
Appalachian Power Co [Member] |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  |  |  |  | $ 4,581,400,000 | $ 4,083,700,000 |  |  |
Pollution Control Bonds | [2] |  |  |  | 429,400,000 | 529,500,000 |  |  |
Securitization Bonds |  |  |  |  | 173,300,000 | 198,800,000 |  |  |
Other Long-term Debt |  |  |  |  | 226,400,000 | 126,900,000 |  |  |
Total Long-term Debt Outstanding |  |  |  |  | 5,410,500,000 | 4,938,900,000 |  |  |
Outstanding Long-term Debt |  |  |  |  |  |  |  |  |
Principal Amount, 2023 |  |  |  |  | 251,800,000 |  |  |  |
Principal Amount, 2024 |  |  |  |  | 113,500,000 |  |  |  |
Principal Amount, 2025 |  |  |  |  | 673,300,000 |  |  |  |
Principal Amount, 2026 |  |  |  |  | 30,900,000 |  |  |  |
Principal Amount, 2027 |  |  |  |  | 355,600,000 |  |  |  |
Principal Amount, After 2027 |  |  |  |  | 4,031,800,000 |  |  |  |
Principal Amount, Total |  |  |  |  | 5,456,900,000 |  |  |  |
Unamortized Discount, Net and Debt Issuance Costs |  |  |  |  | (46,400,000) |  |  |  |
Total Long-term Debt Outstanding |  |  |  |  | 5,410,500,000 | 4,938,900,000 |  |  |
Accounts Receivable and Accrued Unbilled Revenue |  |  |  |  |  |  |  |  |
Accounts Receivable and Accrued Unbilled Revenues |  |  |  |  | 194,400,000 | 153,100,000 |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  | 3,520,700,000 | 3,092,900,000 |  | $ 2,809,200,000 |
Proceeds on Sale of Receivables to AEP Credit |  |  |  |  |  |  |  |  |
Proceeds from Sale of Receivables to AEP Credit |  |  |  |  | 1,552,900,000 | 1,324,100,000 |  | 1,272,900,000 |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  | 230,400,000 | 393,000,000.0 |  | 140,300,000 |
Proceeds from Issuance of Long-term Debt |  |  |  |  | $ 698,000,000.0 | 494,000,000.0 |  | $ 606,900,000 |
Maximum Percentage Debt to Capitalization |  |  |  |  | 67.50% |  |  |  |
Dividend Restrictions |  |  |  |  | $ 543,100,000 |  |  |  |
Appalachian Power Co [Member] | Utility [Member] |  |  |  |  |  |  |  |  |
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits |  |  |  |  |  |  |  |  |
Maximum Borrowings from Money Pool |  |  |  |  | 438,400,000 | 199,300,000 |  |  |
Maximum Loans to Money Pool |  |  |  |  | 214,200,000 | 616,900,000 |  |  |
Average Borrowings from Money Pool |  |  |  |  | 181,700,000 | 87,500,000 |  |  |
Average Loans to Money Pool |  |  |  |  | 45,400,000 | 118,300,000 |  |  |
Net Loans (Borrowings) to/from Money Pool |  |  |  |  | (162,400,000) | (178,500,000) |  |  |
Authorized Short Term Borrowing Limit |  |  |  |  | $ 500,000,000.0 | $ 500,000,000.0 |  |  |
Maximum and Minimum Interest Rates |  |  |  |  |  |  |  |  |
Maximum Interest Rate |  |  |  |  | 5.28% | 0.48% |  | 2.70% |
Minimum Interest Rate |  |  |  |  | 0.10% | 0.02% |  | 0.27% |
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Borrowed |  |  |  |  | 2.34% | 0.41% |  | 2.12% |
Average Interest Rate For Funds Loaned |  |  |  |  | 2.39% | 0.25% |  | 0.85% |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Interest Expense, Related Party |  |  |  |  | $ 5,600,000 | $ 100,000 |  | $ 2,800,000 |
Interest Income Earned on Advances to the Money Pool |  |  |  |  | 2,800,000 | 300,000 |  | 700,000 |
Indiana Michigan Power Co [Member] |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  |  |  |  | 2,597,300,000 | 2,595,500,000 |  |  |
Pollution Control Bonds | [2] |  |  |  | 189,000,000.0 | 188,700,000 |  |  |
Notes Payable | [3] |  |  |  | 183,800,000 | 122,200,000 |  |  |
Spent Nuclear Fuel Obligation | [4] |  |  |  | 285,600,000 | 281,300,000 |  |  |
Other Long-term Debt |  |  |  |  | 5,100,000 | 7,300,000 |  |  |
Total Long-term Debt Outstanding |  |  |  |  | 3,260,800,000 | 3,195,000,000 |  |  |
Outstanding Long-term Debt |  |  |  |  |  |  |  |  |
Principal Amount, 2023 |  |  |  |  | 341,800,000 |  |  |  |
Principal Amount, 2024 |  |  |  |  | 56,400,000 |  |  |  |
Principal Amount, 2025 |  |  |  |  | 220,500,000 |  |  |  |
Principal Amount, 2026 |  |  |  |  | 8,500,000 |  |  |  |
Principal Amount, 2027 |  |  |  |  | 1,700,000 |  |  |  |
Principal Amount, After 2027 |  |  |  |  | 2,660,600,000 |  |  |  |
Principal Amount, Total |  |  |  |  | 3,289,500,000 |  |  |  |
Unamortized Discount, Net and Debt Issuance Costs |  |  |  |  | (28,700,000) |  |  |  |
Total Long-term Debt Outstanding |  |  |  |  | 3,260,800,000 | 3,195,000,000 |  |  |
Accounts Receivable and Accrued Unbilled Revenue |  |  |  |  |  |  |  |  |
Accounts Receivable and Accrued Unbilled Revenues |  |  |  |  | 166,900,000 | 156,900,000 |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  | 2,659,700,000 | 2,330,700,000 |  | 2,236,000,000 |
Proceeds on Sale of Receivables to AEP Credit |  |  |  |  |  |  |  |  |
Proceeds from Sale of Receivables to AEP Credit |  |  |  |  | 2,045,600,000 | 1,927,000,000 |  | 1,891,800,000 |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  | 83,400,000 | 383,500,000 |  | 93,200,000 |
Proceeds from Issuance of Long-term Debt |  |  |  |  | $ 142,700,000 | 546,700,000 |  | $ 69,500,000 |
Maximum Percentage Debt to Capitalization |  |  |  |  | 67.50% |  |  |  |
Dividend Restrictions |  |  |  |  | $ 688,200,000 |  |  |  |
Indiana Michigan Power Co [Member] | Utility [Member] |  |  |  |  |  |  |  |  |
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits |  |  |  |  |  |  |  |  |
Maximum Borrowings from Money Pool |  |  |  |  | 318,600,000 | 166,500,000 |  |  |
Maximum Loans to Money Pool |  |  |  |  | 23,000,000.0 | 368,200,000 |  |  |
Average Borrowings from Money Pool |  |  |  |  | 105,200,000 | 110,400,000 |  |  |
Average Loans to Money Pool |  |  |  |  | 22,300,000 | 67,700,000 |  |  |
Net Loans (Borrowings) to/from Money Pool |  |  |  |  | (226,900,000) | (71,800,000) |  |  |
Authorized Short Term Borrowing Limit |  |  |  |  | $ 500,000,000.0 | $ 500,000,000.0 |  |  |
Maximum and Minimum Interest Rates |  |  |  |  |  |  |  |  |
Maximum Interest Rate |  |  |  |  | 5.28% | 0.48% |  | 2.70% |
Minimum Interest Rate |  |  |  |  | 0.10% | 0.02% |  | 0.27% |
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Borrowed |  |  |  |  | 2.57% | 0.33% |  | 1.07% |
Average Interest Rate For Funds Loaned |  |  |  |  | 2.20% | 0.23% |  | 1.18% |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Interest Expense, Related Party |  |  |  |  | $ 2,900,000 | $ 200,000 |  | $ 1,400,000 |
Interest Income Earned on Advances to the Money Pool |  |  |  |  | 500,000 | 200,000 |  | 200,000 |
Ohio Power Co [Member] |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  |  |  |  | 2,969,700,000 | 2,967,800,000 |  |  |
Other Long-term Debt |  |  |  |  | 600,000 | 700,000 |  |  |
Total Long-term Debt Outstanding |  |  |  |  | 2,970,300,000 | 2,968,500,000 |  |  |
Outstanding Long-term Debt |  |  |  |  |  |  |  |  |
Principal Amount, 2023 |  |  |  |  | 100,000 |  |  |  |
Principal Amount, 2024 |  |  |  |  | 100,000 |  |  |  |
Principal Amount, 2025 |  |  |  |  | 100,000 |  |  |  |
Principal Amount, 2026 |  |  |  |  | 100,000 |  |  |  |
Principal Amount, 2027 |  |  |  |  | 100,000 |  |  |  |
Principal Amount, After 2027 |  |  |  |  | 3,000,100,000 |  |  |  |
Principal Amount, Total |  |  |  |  | 3,000,600,000 |  |  |  |
Unamortized Discount, Net and Debt Issuance Costs |  |  |  |  | (30,300,000) |  |  |  |
Total Long-term Debt Outstanding |  |  |  |  | 2,970,300,000 | 2,968,500,000 |  |  |
Accounts Receivable and Accrued Unbilled Revenue |  |  |  |  |  |  |  |  |
Accounts Receivable and Accrued Unbilled Revenues |  |  |  |  | 478,600,000 | 392,700,000 |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  | 3,672,100,000 | 2,837,500,000 |  | 2,665,000,000 |
Proceeds on Sale of Receivables to AEP Credit |  |  |  |  |  |  |  |  |
Proceeds from Sale of Receivables to AEP Credit |  |  |  |  | 3,101,300,000 | 2,458,500,000 |  | 2,366,200,000 |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  | 100,000 | 500,100,000 |  | 100,000 |
Proceeds from Issuance of Long-term Debt |  |  |  |  | 0 | 1,037,100,000 |  | $ 347,000,000.0 |
Dividend Restrictions |  |  |  |  | 0 |  |  |  |
Ohio Power Co [Member] | Utility [Member] |  |  |  |  |  |  |  |  |
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits |  |  |  |  |  |  |  |  |
Maximum Borrowings from Money Pool |  |  |  |  | 262,500,000 | 259,200,000 |  |  |
Maximum Loans to Money Pool |  |  |  |  | 246,100,000 | 622,900,000 |  |  |
Average Borrowings from Money Pool |  |  |  |  | 101,300,000 | 61,600,000 |  |  |
Average Loans to Money Pool |  |  |  |  | 86,900,000 | 127,200,000 |  |  |
Net Loans (Borrowings) to/from Money Pool |  |  |  |  | (172,900,000) | 42,000,000.0 |  |  |
Authorized Short Term Borrowing Limit |  |  |  |  | $ 500,000,000.0 | $ 500,000,000.0 |  |  |
Maximum and Minimum Interest Rates |  |  |  |  |  |  |  |  |
Maximum Interest Rate |  |  |  |  | 5.28% | 0.48% |  | 2.70% |
Minimum Interest Rate |  |  |  |  | 0.10% | 0.02% |  | 0.27% |
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Borrowed |  |  |  |  | 3.51% | 0.27% |  | 0.99% |
Average Interest Rate For Funds Loaned |  |  |  |  | 1.22% | 0.14% |  | 2.06% |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Interest Expense, Related Party |  |  |  |  | $ 2,300,000 | $ 100,000 |  | $ 1,800,000 |
Interest Income Earned on Advances to the Money Pool |  |  |  |  | $ 400,000 | $ 100,000 |  | 0 |
Public Service Co Of Oklahoma [Member] |  |  |  |  |  |  |  |  |
Shares of Company |  |  |  |  |  |  |  |  |
Beginning Balance, Shares |  |  | 10,482,000 | 10,482,000 | 10,482,000 |  |  |  |
Ending Balance, Shares |  |  |  |  | 10,482,000 | 10,482,000 |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  |  |  |  | $ 1,785,600,000 | $ 1,785,500,000 |  |  |
Other Long-term Debt |  |  |  |  | 127,200,000 | 128,000,000.0 |  |  |
Total Long-term Debt Outstanding |  |  |  |  | 1,912,800,000 | 1,913,500,000 |  |  |
Outstanding Long-term Debt |  |  |  |  |  |  |  |  |
Principal Amount, 2023 |  |  |  |  | 500,000 |  |  |  |
Principal Amount, 2024 |  |  |  |  | 600,000 |  |  |  |
Principal Amount, 2025 |  |  |  |  | 250,600,000 |  |  |  |
Principal Amount, 2026 |  |  |  |  | 50,600,000 |  |  |  |
Principal Amount, 2027 |  |  |  |  | 300,000 |  |  |  |
Principal Amount, After 2027 |  |  |  |  | 1,625,000,000 |  |  |  |
Principal Amount, Total |  |  |  |  | 1,927,600,000 |  |  |  |
Unamortized Discount, Net and Debt Issuance Costs |  |  |  |  | (14,800,000) |  |  |  |
Total Long-term Debt Outstanding |  |  |  |  | 1,912,800,000 | 1,913,500,000 |  |  |
Accounts Receivable and Accrued Unbilled Revenue |  |  |  |  |  |  |  |  |
Accounts Receivable and Accrued Unbilled Revenues |  |  |  |  | 155,500,000 | 114,500,000 |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  | 1,875,700,000 | 1,474,300,000 |  | 1,263,900,000 |
Proceeds on Sale of Receivables to AEP Credit |  |  |  |  |  |  |  |  |
Proceeds from Sale of Receivables to AEP Credit |  |  |  |  | 1,809,500,000 | 1,406,400,000 |  | 1,221,000,000 |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  | 500,500,000 | 750,500,000 |  | 13,200,000 |
Proceeds from Issuance of Long-term Debt |  |  |  |  | $ 499,700,000 | 1,290,000,000 |  | $ 0 |
Maximum Percentage Debt to Capitalization |  |  |  |  | 67.50% |  |  |  |
Dividend Restrictions |  |  |  |  | $ 0 |  |  |  |
Public Service Co Of Oklahoma [Member] | Utility [Member] |  |  |  |  |  |  |  |  |
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits |  |  |  |  |  |  |  |  |
Maximum Borrowings from Money Pool |  |  |  |  | 364,200,000 | 267,700,000 |  |  |
Maximum Loans to Money Pool |  |  |  |  | 432,500,000 | 747,300,000 |  |  |
Average Borrowings from Money Pool |  |  |  |  | 224,500,000 | 134,000,000.0 |  |  |
Average Loans to Money Pool |  |  |  |  | 402,800,000 | 113,100,000 |  |  |
Net Loans (Borrowings) to/from Money Pool |  |  |  |  | (364,200,000) | (72,300,000) |  |  |
Authorized Short Term Borrowing Limit |  |  |  |  | $ 400,000,000.0 | $ 400,000,000.0 |  |  |
Maximum and Minimum Interest Rates |  |  |  |  |  |  |  |  |
Maximum Interest Rate |  |  |  |  | 5.28% | 0.48% |  | 2.70% |
Minimum Interest Rate |  |  |  |  | 0.10% | 0.02% |  | 0.27% |
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Borrowed |  |  |  |  | 2.65% | 0.34% |  | 0.92% |
Average Interest Rate For Funds Loaned |  |  |  |  | 0.75% | 0.07% |  | 1.95% |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Interest Expense, Related Party |  |  |  |  | $ 5,500,000 | $ 300,000 |  | $ 600,000 |
Interest Income Earned on Advances to the Money Pool |  |  |  |  | 300,000 | 0 |  | 100,000 |
Southwestern Electric Power Co [Member] |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  |  |  |  | 3,297,600,000 | 3,295,100,000 |  |  |
Notes Payable | [3] |  |  |  | 55,900,000 | 59,100,000 |  |  |
Other Long-term Debt |  |  |  |  | 38,100,000 | 41,000,000.0 |  |  |
Total Long-term Debt Outstanding |  |  |  |  | 3,391,600,000 | 3,395,200,000 |  |  |
Outstanding Long-term Debt |  |  |  |  |  |  |  |  |
Principal Amount, 2023 |  |  |  |  | 6,200,000 |  |  |  |
Principal Amount, 2024 |  |  |  |  | 6,200,000 |  |  |  |
Principal Amount, 2025 |  |  |  |  | 6,200,000 |  |  |  |
Principal Amount, 2026 |  |  |  |  | 906,200,000 |  |  |  |
Principal Amount, 2027 |  |  |  |  | 6,200,000 |  |  |  |
Principal Amount, After 2027 |  |  |  |  | 2,488,200,000 |  |  |  |
Principal Amount, Total |  |  |  |  | 3,419,200,000 |  |  |  |
Unamortized Discount, Net and Debt Issuance Costs |  |  |  |  | (27,600,000) |  |  |  |
Total Long-term Debt Outstanding |  |  |  |  | 3,391,600,000 | 3,395,200,000 |  |  |
Accounts Receivable and Accrued Unbilled Revenue |  |  |  |  |  |  |  |  |
Accounts Receivable and Accrued Unbilled Revenues |  |  |  |  | 194,000,000.0 | 153,000,000.0 |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  | 2,283,200,000 | 2,126,000,000 |  | 1,735,300,000 |
Proceeds on Sale of Receivables to AEP Credit |  |  |  |  |  |  |  |  |
Proceeds from Sale of Receivables to AEP Credit |  |  |  |  | 1,858,400,000 | 1,636,100,000 |  | 1,593,800,000 |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  | 6,200,000 | 381,200,000 |  | 21,200,000 |
Proceeds from Issuance of Long-term Debt |  |  |  |  | $ 0 | 1,137,600,000 |  | 0 |
Maximum Percentage Debt to Capitalization |  |  |  |  | 67.50% |  |  |  |
Dividend Restrictions |  |  |  |  | $ 373,000,000.0 |  |  |  |
Dividends Paid on Common Stock |  |  |  |  | (3,400,000) | (4,800,000) |  | $ (1,900,000) |
Southwestern Electric Power Co [Member] | Utility [Member] |  |  |  |  |  |  |  |  |
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits |  |  |  |  |  |  |  |  |
Maximum Borrowings from Money Pool |  |  |  |  | 358,400,000 | 280,300,000 |  |  |
Maximum Loans to Money Pool |  |  |  |  | 156,600,000 | 561,900,000 |  |  |
Average Borrowings from Money Pool |  |  |  |  | 219,300,000 | 142,400,000 |  |  |
Average Loans to Money Pool |  |  |  |  | 109,700,000 | 287,400,000 |  |  |
Net Loans (Borrowings) to/from Money Pool |  |  |  |  | (310,700,000) | 153,800,000 |  |  |
Authorized Short Term Borrowing Limit |  |  |  |  | $ 400,000,000.0 | $ 400,000,000.0 |  |  |
Maximum and Minimum Interest Rates |  |  |  |  |  |  |  |  |
Maximum Interest Rate |  |  |  |  | 5.28% | 0.48% |  | 2.70% |
Minimum Interest Rate |  |  |  |  | 0.10% | 0.02% |  | 0.27% |
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Borrowed |  |  |  |  | 2.80% | 0.26% |  | 1.27% |
Average Interest Rate For Funds Loaned |  |  |  |  | 0.55% | 0.18% |  | 0.00% |
Southwestern Electric Power Co [Member] | Utility [Member] | Nonutility [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Interest Expense, Related Party |  |  |  |  | $ 4,900,000 | $ 300,000 |  | $ 1,500,000 |
Interest Income Earned on Advances to the Money Pool |  |  |  |  | $ 200,000 | $ 100,000 |  | $ 0 |
Southwestern Electric Power Co [Member] | Nonutility [Member] |  |  |  |  |  |  |  |  |
Maximum Interest Rate For Funds Loaned |  |  |  |  | 5.28% | 0.58% |  | 2.70% |
Minimum Interest Rate for Funds Loaned |  |  |  |  | 0.46% | 0.21% |  | 0.27% |
Money Pool Participants' Money Pool Activity and Authorized Borrowing Limits |  |  |  |  |  |  |  |  |
Maximum Loans to Money Pool |  |  |  |  | $ 2,100,000 | $ 2,100,000 |  |  |
Average Loans to Money Pool |  |  |  |  | 2,100,000 | 2,100,000 |  |  |
Net Loans (Borrowings) to/from Money Pool |  |  |  |  | $ 2,100,000 | $ 2,100,000 |  |  |
Average Interest Rates for Funds Borrowed from and Loaned to Money Pool |  |  |  |  |  |  |  |  |
Average Interest Rate For Funds Loaned |  |  |  |  | 2.23% | 0.37% |  | 1.18% |
Senior Notes [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2022 |  |  |  |
Maturity Date High |  |  |  |  | 2052 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 3.98% |  |  |  |
Senior Notes [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 0.75% | 0.61% |  |  |
Senior Notes [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 8.13% | 8.13% |  |  |
Senior Notes [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2023 |  |  |  |
Maturity Date High |  |  |  |  | 2052 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 4.06% |  |  |  |
Senior Notes [Member] | AEP Texas Inc. [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 2.10% | 2.10% |  |  |
Senior Notes [Member] | AEP Texas Inc. [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 6.76% | 6.76% |  |  |
Senior Notes [Member] | AEP Transmission Co [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2023 |  |  |  |
Maturity Date High |  |  |  |  | 2052 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 3.83% |  |  |  |
Senior Notes [Member] | AEP Transmission Co [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 2.75% | 2.75% |  |  |
Senior Notes [Member] | AEP Transmission Co [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 5.52% | 5.52% |  |  |
Senior Notes [Member] | Appalachian Power Co [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2025 |  |  |  |
Maturity Date High |  |  |  |  | 2050 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 4.68% |  |  |  |
Senior Notes [Member] | Appalachian Power Co [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 2.70% | 2.70% |  |  |
Senior Notes [Member] | Appalachian Power Co [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 7.00% | 7.00% |  |  |
Senior Notes [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2023 |  |  |  |
Maturity Date High |  |  |  |  | 2051 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 4.19% |  |  |  |
Senior Notes [Member] | Indiana Michigan Power Co [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 3.20% | 3.20% |  |  |
Senior Notes [Member] | Indiana Michigan Power Co [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 6.05% | 6.05% |  |  |
Senior Notes [Member] | Ohio Power Co [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2030 |  |  |  |
Maturity Date High |  |  |  |  | 2051 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 3.87% |  |  |  |
Senior Notes [Member] | Ohio Power Co [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 1.63% | 1.63% |  |  |
Senior Notes [Member] | Ohio Power Co [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 6.60% | 6.60% |  |  |
Senior Notes [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2025 |  |  |  |
Maturity Date High |  |  |  |  | 2051 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 3.74% |  |  |  |
Senior Notes [Member] | Public Service Co Of Oklahoma [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 2.20% | 2.20% |  |  |
Senior Notes [Member] | Public Service Co Of Oklahoma [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 6.63% | 6.63% |  |  |
Senior Notes [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2026 |  |  |  |
Maturity Date High |  |  |  |  | 2051 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 3.57% |  |  |  |
Senior Notes [Member] | Southwestern Electric Power Co [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 1.65% | 1.65% |  |  |
Senior Notes [Member] | Southwestern Electric Power Co [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 6.20% | 6.20% |  |  |
Pollution Control Bonds [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low | [13] |  |  |  | 2022 |  |  |  |
Maturity Date High | [13] |  |  |  | 2036 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 2.74% |  |  |  |
Pollution Control Bonds [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 0.63% | 0.19% |  |  |
Pollution Control Bonds [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 4.55% | 4.55% |  |  |
Pollution Control Bonds [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low | [13] |  |  |  | 2023 |  |  |  |
Maturity Date High | [13] |  |  |  | 2030 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 3.42% |  |  |  |
Pollution Control Bonds [Member] | AEP Texas Inc. [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 0.90% | 0.90% |  |  |
Pollution Control Bonds [Member] | AEP Texas Inc. [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 4.55% | 4.55% |  |  |
Pollution Control Bonds [Member] | Appalachian Power Co [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low | [13] |  |  |  | 2024 |  |  |  |
Maturity Date High | [13] |  |  |  | 2036 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 2.74% |  |  |  |
Pollution Control Bonds [Member] | Appalachian Power Co [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 0.63% | 0.19% |  |  |
Pollution Control Bonds [Member] | Appalachian Power Co [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 3.80% | 2.75% |  |  |
Pollution Control Bonds [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low | [13] |  |  |  | 2025 |  |  |  |
Maturity Date High | [13] |  |  |  | 2025 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 2.49% |  |  |  |
Pollution Control Bonds [Member] | Indiana Michigan Power Co [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 0.75% | 0.75% |  |  |
Pollution Control Bonds [Member] | Indiana Michigan Power Co [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 3.05% | 3.05% |  |  |
Notes Payable, Other Payables [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2022 |  |  |  |
Maturity Date High |  |  |  |  | 2032 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 4.29% |  |  |  |
Notes Payable, Other Payables [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 0.93% | 0.79% |  |  |
Notes Payable, Other Payables [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 6.37% | 6.37% |  |  |
Notes Payable, Other Payables [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2023 |  |  |  |
Maturity Date High |  |  |  |  | 2027 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 4.26% |  |  |  |
Notes Payable, Other Payables [Member] | Indiana Michigan Power Co [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 0.93% | 0.79% |  |  |
Notes Payable, Other Payables [Member] | Indiana Michigan Power Co [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 5.93% | 1.24% |  |  |
Notes Payable, Other Payables [Member] | Indiana Michigan Power Co [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  | $ 8,000,000 |  | $ 8,000,000 |  |  |  |  |
Notes Payable, Other Payables [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2024 |  |  |  |
Maturity Date High |  |  |  |  | 2032 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 5.38% |  |  |  |
Notes Payable, Other Payables [Member] | Southwestern Electric Power Co [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 4.58% | 4.58% |  |  |
Notes Payable, Other Payables [Member] | Southwestern Electric Power Co [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 6.37% | 6.37% |  |  |
Securitization Bonds [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low | [14] |  |  |  | 2023 |  |  |  |
Maturity Date High | [14] |  |  |  | 2029 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 2.91% |  |  |  |
Securitization Bonds [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 2.01% | 2.01% |  |  |
Securitization Bonds [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 3.77% | 3.77% |  |  |
Securitization Bonds [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low | [14] |  |  |  | 2024 |  |  |  |
Maturity Date High | [14] |  |  |  | 2029 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 2.50% |  |  |  |
Securitization Bonds [Member] | AEP Texas Inc. [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 2.06% | 2.06% |  |  |
Securitization Bonds [Member] | AEP Texas Inc. [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 2.84% | 2.84% |  |  |
Securitization Bonds [Member] | AEP Texas Inc. [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  | 12,000,000 |  |  |  |  |  |  |
Securitization Bonds [Member] | Appalachian Power Co [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low | [14] |  |  |  | 2023 |  |  |  |
Maturity Date High | [14] |  |  |  | 2028 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 3.67% |  |  |  |
Securitization Bonds [Member] | Appalachian Power Co [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 2.01% | 2.01% |  |  |
Securitization Bonds [Member] | Appalachian Power Co [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 3.77% | 3.77% |  |  |
Securitization Bonds [Member] | Appalachian Power Co [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  | $ 13,000,000 |  |  |  |  |  |  |
Junior Subordinated Notes [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2024 |  |  |  |
Maturity Date High |  |  |  |  | 2027 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 2.35% |  |  |  |
Junior Subordinated Notes [Member] | 2019 Equity Units [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  | $ 805,000,000 |  |  |  |
Principal Amounts of Junior Subordinated Debt |  |  |  |  | 805,000,000 |  |  |  |
Junior Subordinated Notes [Member] | 2020 Equity Units [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  | 850,000,000 |  |  |  |
Principal Amounts of Junior Subordinated Debt |  |  |  |  | $ 850,000,000 |  |  |  |
Junior Subordinated Notes [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 1.30% | 1.30% |  |  |
Junior Subordinated Notes [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 3.88% | 3.88% |  |  |
Other Long Term Debt [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2022 |  |  |  |
Maturity Date High |  |  |  |  | 2059 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 5.44% |  |  |  |
Other Long Term Debt [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 1.15% | 0.76% |  |  |
Other Long Term Debt [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 13.72% | 13.72% |  |  |
Other Long Term Debt [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2025 |  |  |  |
Maturity Date High |  |  |  |  | 2059 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 5.67% |  |  |  |
Other Long Term Debt [Member] | AEP Texas Inc. [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 4.50% | 1.35% |  |  |
Other Long Term Debt [Member] | AEP Texas Inc. [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 5.67% | 4.50% |  |  |
Other Long Term Debt [Member] | Appalachian Power Co [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2023 |  |  |  |
Maturity Date High |  |  |  |  | 2026 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 5.34% |  |  |  |
Other Long Term Debt [Member] | Appalachian Power Co [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 4.84% | 1.24% |  |  |
Other Long Term Debt [Member] | Appalachian Power Co [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 13.72% | 13.72% |  |  |
Other Long Term Debt [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2025 |  |  |  |
Maturity Date High |  |  |  |  | 2025 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 6.00% |  |  |  |
Other Long Term Debt [Member] | Indiana Michigan Power Co [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 6.00% | 6.00% |  |  |
Other Long Term Debt [Member] | Indiana Michigan Power Co [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 6.00% | 6.00% |  |  |
Other Long Term Debt [Member] | Ohio Power Co [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2028 |  |  |  |
Maturity Date High |  |  |  |  | 2028 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 1.15% |  |  |  |
Other Long Term Debt [Member] | Ohio Power Co [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 1.15% | 1.15% |  |  |
Other Long Term Debt [Member] | Ohio Power Co [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 1.15% | 1.15% |  |  |
Other Long Term Debt [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2025 |  |  |  |
Maturity Date High |  |  |  |  | 2027 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 5.69% |  |  |  |
Other Long Term Debt [Member] | Public Service Co Of Oklahoma [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 3.00% | 1.47% |  |  |
Other Long Term Debt [Member] | Public Service Co Of Oklahoma [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 5.75% | 3.00% |  |  |
Other Long Term Debt [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Maturity Date Low |  |  |  |  | 2028 |  |  |  |
Maturity Date High |  |  |  |  | 2028 |  |  |  |
Weighted Average Interest Rate |  |  |  |  | 4.68% |  |  |  |
Other Long Term Debt [Member] | Southwestern Electric Power Co [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 4.68% | 4.68% |  |  |
Other Long Term Debt [Member] | Southwestern Electric Power Co [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Long- term Debt by Type of Debt and Maturity |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 4.68% | 4.68% |  |  |
Junior Subordinated Debt [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 2.031% |  |  |  |
Junior Subordinated Debt [Member] | 2019 Equity Units [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 3.40% |  |  |  |
Junior Subordinated Debt [Member] | 2020 Equity Units [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 1.30% |  |  |  |
Senior Unsecured Notes | Public Service Co Of Oklahoma [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  | $ 475,000,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.25% |  |  |  |  |  |
Servicing Contracts [Member] | Appalachian Power Co [Member] |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  | $ 9,400,000 | $ 4,900,000 | [15] | $ 5,200,000 |
Servicing Contracts [Member] | Indiana Michigan Power Co [Member] |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  | 9,700,000 | 7,000,000.0 | [15] | 7,900,000 |
Servicing Contracts [Member] | Ohio Power Co [Member] |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  | 29,800,000 | 8,300,000 | [15] | 24,100,000 |
Servicing Contracts [Member] | Public Service Co Of Oklahoma [Member] |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  | 7,400,000 | 3,400,000 | [15] | 4,800,000 |
Servicing Contracts [Member] | Southwestern Electric Power Co [Member] |  |  |  |  |  |  |  |  |
Fees Paid to AEP Credit for Customer Accounts Receivable Sold |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  | 9,400,000 | 5,400,000 | [15] | 6,700,000 |
Retained Earnings [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Forward Equity Purchase Contracts Included in Current and Noncurrent Liabilities as of December 31, |  |  |  |  |  | (1,100,000) |  |  |
Dividends Paid on Common Stock |  |  |  |  | (1,600,000,000) | (1,500,000,000) |  | (1,400,000,000) |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Forward Equity Purchase Contracts Included in Current and Noncurrent Liabilities as of December 31, |  |  |  |  | 56,300,000 | $ 32,600,000 | [16] | $ (85,800,000) | [17]
Additional Paid-in Capital [Member] | 2020 Equity Units [Member] |  |  |  |  |  |  |  |  |
Financing Activities (Textuals) |  |  |  |  |  |  |  |  |
Forward Equity Purchase Contracts Included in Current and Noncurrent Liabilities as of December 31, |  |  |  |  | $ 121,000,000 |  |  |  |
[1] | Reissued Treasury Stock used to fulfill share commitments related to AEP’s Equity Units. See “Equity Units” section below for additional information.
[2] | For certain series of Pollution Control Bonds, interest rates are subject to periodic adjustment. Certain series may be purchased on demand at periodic interest adjustment dates. Letters of credit from banks and insurance policies support certain series. Consequently, these bonds have been classified for maturity purposes as Long-term Debt Due Within One Year - Nonaffiliated on the balance sheets.
[3] | Notes payable represent outstanding promissory notes issued under term loan agreements and credit agreements with a number of banks and other financial institutions. At expiration, all notes then issued and outstanding are due and payable. Interest rates are both fixed and variable. Variable rates generally relate to specified short-term interest rates.
[4] | Spent Nuclear Fuel Obligation consists of a liability along with accrued interest for disposal of SNF. See “Spent Nuclear Fuel Disposal” section of Note 6 for additional information.
[5] | See “Equity Units” section below for additional information.
[6] | Amount includes $805 million of Junior Subordinated Notes. See “Equity Units” section below for additional information.
[7] | Amount includes $850 million of Junior Subordinated Notes. See “Equity Units” section below for additional information.
[8] | Amount of securitized debt for receivables as accounted for under the “Transfers and Servicing” accounting guidance.
[9] | Weighted-average rate as of December 31, 2022 and 2021, respectively.
[10] | Includes the restrictions of consolidated and non-consolidated subsidiaries.
[11] | Amount represents the combined authorized short-term borrowing limit the State Transcos have from FERC or state regulatory commissions.
[12] | Amount represents the combined authorized short-term borrowing limit the State Transcos have from FERC or state regulatory commissions.
[13] | Certain Pollution Control Bonds are subject to redemption earlier than the maturity date.
[14] | Dates represent the scheduled final payment dates for the securitization bonds. The legal maturity date is one to two years later. These bonds have been classified for maturity and repayment purposes based on the scheduled final payment date.
[15] | In 2021, due to the successful collection of accounts receivable balances during the COVID-19 pandemic, the allowance for doubtful accounts was reduced, resulting in the issuance of credits to offset the higher fees previously paid and to lower subsequent fees paid.
[16] | Includes $(121) million related to a forward equity purchase contract associated with the issuance of Equity Units. See “Equity Units” section of Note 14 for additional information.
[17] | (b)

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