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Significant Accounting Matters (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Amounts Attributable to AEP Common Shareholders |  |  |  |  |  |  |
Earnings Attributable to Common Shareholders |  | $ 340,300 | $ 521,200 | $ 1,343,400 | $ 918,200 |  |
Weighted Average Number of Basic AEP Common Shares Outstanding |  | 528,898,816 | 514,879,144 | 527,725,426 | 514,529,837 |  |
Total Basic Earnings Per Share Attributable to AEP Common Shareholders |  | $ 0.64 | $ 1.01 | $ 2.55 | $ 1.78 |  |
Weighted Average Dilutive Effect of: |  |  |  |  |  |  |
Weighted Average Number of Diluted AEP Common Shares Outstanding |  | 530,140,990 | 516,242,919 | 528,868,693 | 515,922,446 |  |
Total Diluted Earnings Per Share Attributable to AEP Common Shareholders |  | $ 0.64 | $ 1.01 | $ 2.54 | $ 1.78 |  |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |  |  |
Cash and Cash Equivalents |  | $ 202,500 |  | $ 202,500 |  | $ 330,100 |
Restricted Cash |  | 45,400 |  | 45,400 |  | 48,900 |
Total Cash, Cash Equivalents and Restricted Cash |  | 247,900 | $ 350,700 | 247,900 | $ 350,700 | 379,000 | $ 556,500
Proceeds from Issuance of Debt | [1] |  |  | 3,698,400 |  |  |
Securities Received as Collateral |  | 155,000 |  | 155,000 |  | 46,000 |
Cash Paid for Interest, Net of Capitalized Amounts |  |  |  | 881,000 | 773,500 |  |
Net Cash Paid (Received) for Income Taxes |  |  |  | 60,800 | 9,900 |  |
Acquisition Of Nuclear Fuel Included In Current Liabilities |  |  |  | 8,200 | (36,000) |  |
Increase (Decrease) in Accounts Payable |  |  |  | 77,000 | 62,600 |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  | 2,904,200 | 1,881,600 |  |
Payments for Nuclear Fuel |  |  |  | (69,800) | (73,900) |  |
Net Cash Provided by (Used in) Investing Activities |  |  |  | (3,249,700) | (4,265,500) |  |
AEP Texas Inc. [Member] |  |  |  |  |  |  |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |  |  |
Cash and Cash Equivalents |  | 100 |  | 100 |  | 100 |
Restricted Cash |  | 29,400 |  | 29,400 |  | 34,000 |
Total Cash, Cash Equivalents and Restricted Cash |  | 29,500 | 30,800 | 29,500 | 30,800 | 34,100 | 32,800
Cash Paid for Interest, Net of Capitalized Amounts |  |  |  | 111,000 | 108,300 |  |
Net Cash Paid (Received) for Income Taxes |  |  |  | (5,400) | 700 |  |
Increase (Decrease) in Accounts Payable |  |  |  | 26,000 | 1,900 |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  | 386,100 | 227,000 |  |
Net Cash Provided by (Used in) Investing Activities |  |  |  | (883,600) | (814,000) |  |
AEP Transmission Co [Member] |  |  |  |  |  |  |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |  |  |
Cash and Cash Equivalents |  | 0 | 0 | 0 | 0 | 0 | 0
Cash Paid for Interest, Net of Capitalized Amounts |  |  |  | 96,900 | 82,800 |  |
Net Cash Paid (Received) for Income Taxes |  |  |  | (12,500) | 32,000 |  |
Increase (Decrease) in Accounts Payable |  |  |  | (6,500) | 64,600 |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  | 573,100 | 482,900 |  |
Net Cash Provided by (Used in) Investing Activities |  |  |  | (854,600) | (948,500) |  |
Appalachian Power Co [Member] |  |  |  |  |  |  |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |  |  |
Cash and Cash Equivalents |  | 4,000 |  | 4,000 |  | 5,000 |
Restricted Cash |  | 15,900 |  | 15,900 |  | 14,900 |
Total Cash, Cash Equivalents and Restricted Cash |  | 19,900 | 21,900 | 19,900 | 21,900 | 19,900 | 21,900
Cash Paid for Interest, Net of Capitalized Amounts |  |  |  | 126,600 | 125,900 |  |
Net Cash Paid (Received) for Income Taxes |  |  |  | 9,600 | 23,400 |  |
Increase (Decrease) in Accounts Payable |  |  |  | 66,400 | (128,700) |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  | 610,800 | 282,900 |  |
Net Cash Provided by (Used in) Investing Activities |  |  |  | (458,000) | (554,600) |  |
Indiana Michigan Power Co [Member] |  |  |  |  |  |  |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |  |  |
Cash and Cash Equivalents |  | 2,400 | 3,800 | 2,400 | 3,800 | 2,100 | 4,200
Cash Paid for Interest, Net of Capitalized Amounts |  |  |  | 72,800 | 62,100 |  |
Net Cash Paid (Received) for Income Taxes |  |  |  | (14,500) | 13,800 |  |
Acquisition Of Nuclear Fuel Included In Current Liabilities |  |  |  | 8,200 | 36,000 |  |
Increase (Decrease) in Accounts Payable |  |  |  | (7,500) | (25,200) |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  | 426,300 | 429,700 |  |
Payments for Nuclear Fuel |  |  |  | (69,800) | (1,900) |  |
Net Cash Provided by (Used in) Investing Activities |  |  |  | (374,100) | (310,200) |  |
Indiana Michigan Power Co [Member] | Revision of Prior Period, Adjustment |  |  |  |  |  |  |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |  |  |
Acquisition Of Nuclear Fuel Included In Current Liabilities |  |  |  |  | 72,000 |  |
Increase (Decrease) in Accounts Payable |  |  |  |  | (72,000) |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  |  | (72,000) |  |
Payments for Nuclear Fuel |  |  |  |  | (72,000) |  |
Net Cash Provided by (Used in) Investing Activities |  |  |  |  | 72,000 |  |
Indiana Michigan Power Co [Member] | Previously Reported |  |  |  |  |  |  |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |  |  |
Acquisition Of Nuclear Fuel Included In Current Liabilities |  |  |  |  | (36,000) |  |
Increase (Decrease) in Accounts Payable |  |  |  |  | 46,800 |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  |  | 501,700 |  |
Payments for Nuclear Fuel |  |  |  |  | 73,900 |  |
Net Cash Provided by (Used in) Investing Activities |  |  |  |  | (382,200) |  |
Ohio Power Co [Member] |  |  |  |  |  |  |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |  |  |
Cash and Cash Equivalents |  | 6,300 |  | 6,300 |  | 6,400 |
Total Cash, Cash Equivalents and Restricted Cash |  | 6,300 | 9,700 | 6,300 | 9,700 | 6,400 | 9,600
Cash Paid for Interest, Net of Capitalized Amounts |  |  |  | 64,600 | 57,600 |  |
Net Cash Paid (Received) for Income Taxes |  |  |  | (13,000) | 9,200 |  |
Increase (Decrease) in Accounts Payable |  |  |  | (47,200) | 30,800 |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  | 256,400 | 69,600 |  |
Net Cash Provided by (Used in) Investing Activities |  |  |  | (490,400) | (536,600) |  |
Public Service Co Of Oklahoma [Member] |  |  |  |  |  |  |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |  |  |
Cash and Cash Equivalents |  | 2,500 | 4,600 | 2,500 | 4,600 | 2,500 | 4,000
Cash Paid for Interest, Net of Capitalized Amounts |  |  |  | 51,600 | 37,600 |  |
Net Cash Paid (Received) for Income Taxes |  |  |  | (3,000) | (6,100) |  |
Increase (Decrease) in Accounts Payable |  |  |  | 109,800 | 75,200 |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  | 136,800 | 256,800 |  |
Net Cash Provided by (Used in) Investing Activities |  |  |  | (273,000) | (408,200) |  |
Southwestern Electric Power Co [Member] |  |  |  |  |  |  |
Amounts Attributable to AEP Common Shareholders |  |  |  |  |  |  |
Earnings Attributable to Common Shareholders |  | (70,100) | 81,000 | 138,000 | 121,600 |  |
Cash, Cash Equivalents and Restricted Cash |  |  |  |  |  |  |
Cash and Cash Equivalents |  | $ 2,400 | $ 4,600 | 2,400 | 4,600 | $ 2,400 | $ 88,400
Cash Paid for Interest, Net of Capitalized Amounts |  |  |  | 71,600 | 48,700 |  |
Net Cash Paid (Received) for Income Taxes |  |  |  | 14,900 | (17,100) |  |
Increase (Decrease) in Accounts Payable |  |  |  | 60,200 | 81,200 |  |
Net Cash Provided by (Used in) Operating Activities |  |  |  | 310,900 | 384,700 |  |
Net Cash Provided by (Used in) Investing Activities |  |  |  | $ (347,400) | $ (428,900) |  |
Restricted Stock Units and Performance Share Units [Member] |  |  |  |  |  |  |
Weighted Average Dilutive Effect of: |  |  |  |  |  |  |
Weighted Average Dilutive Effect of Shares |  | 1,200,000 | 1,300,000 | 1,200,000 | 1,400,000 |  |
Dilutive Securities, Effect on Basic Earnings Per Share |  | $ 0 | $ 0 | $ (0.01) | $ 0 |  |
[1] | 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.

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