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VARIABLE INTEREST ENTITIES - Schedule of Consolidated Assets And Liabilities Of Variable Interest Entities (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
ASSETS |  |  |  |  |  |
Current Assets | $ 6,321.9 |  | $ 5,788.8 |  |  |
Net Property, Plant and Equipment | 86,337.1 |  | 82,415.6 |  |  |
Other Noncurrent Assets | 15,119.5 |  | 14,873.6 |  |  |
TOTAL ASSETS | 107,778.5 |  | 103,078.0 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Current Liabilities | 11,443.3 |  | 13,009.3 |  |  |
Noncurrent Liabilities | 65,316.2 |  | 63,044.8 |  |  |
Equity | 30,968.4 | $ 27,364.0 | 26,986.1 | $ 26,175.7 | $ 25,843.7 | $ 25,285.9
TOTAL LIABILITIES, MEZZANINE EQUITY AND TOTAL EQUITY | 107,778.5 |  | 103,078.0 |  |  |
SWEPCo |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Current Assets | 635.5 |  | 438.0 |  |  |
Net Property, Plant and Equipment | 9,671.9 |  | 9,446.1 |  |  |
Other Noncurrent Assets | 1,647.8 |  | 1,610.9 |  |  |
TOTAL ASSETS | 11,955.2 |  | 11,495.0 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Current Liabilities | 1,365.8 |  | 1,031.6 |  |  |
Noncurrent Liabilities | 6,070.0 |  | 6,558.4 |  |  |
Equity | 4,519.4 | $ 3,953.4 | 3,905.0 | $ 3,758.3 | $ 3,928.4 | $ 3,770.4
TOTAL LIABILITIES, MEZZANINE EQUITY AND TOTAL EQUITY | 11,955.2 |  | 11,495.0 |  |  |
I&M |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Current Assets | 525.5 |  | 543.6 |  |  |
Net Property, Plant and Equipment | 7,796.4 |  | 7,679.3 |  |  |
Other Noncurrent Assets | 5,574.9 |  | 5,312.6 |  |  |
TOTAL ASSETS | 13,896.8 |  | 13,535.5 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Current Liabilities | 853.9 |  | 1,071.2 |  |  |
Noncurrent Liabilities | 9,507.1 |  | 9,067.8 |  |  |
TOTAL LIABILITIES, MEZZANINE EQUITY AND TOTAL EQUITY | 13,896.8 |  | 13,535.5 |  |  |
AEP Texas |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Current Assets | 493.0 |  | 500.4 |  |  |
Net Property, Plant and Equipment | 14,681.5 |  | 14,043.5 |  |  |
Other Noncurrent Assets | 733.9 |  | 655.7 |  |  |
TOTAL ASSETS | 15,908.4 |  | 15,199.6 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Current Liabilities | 1,626.0 |  | 1,407.1 |  |  |
Noncurrent Liabilities | 8,925.0 |  | 8,907.9 |  |  |
TOTAL LIABILITIES, MEZZANINE EQUITY AND TOTAL EQUITY | 15,908.4 |  | 15,199.6 |  |  |
APCo |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Current Assets | 1,088.1 |  | 1,094.9 |  |  |
Net Property, Plant and Equipment | 13,835.1 |  | 13,612.5 |  |  |
Other Noncurrent Assets | 1,998.8 |  | 1,958.5 |  |  |
TOTAL ASSETS | 16,922.0 |  | 16,665.9 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Current Liabilities | 1,395.9 |  | 2,025.5 |  |  |
Noncurrent Liabilities | 9,550.0 |  | 8,892.4 |  |  |
TOTAL LIABILITIES, MEZZANINE EQUITY AND TOTAL EQUITY | 16,922.0 |  | 16,665.9 |  |  |
Variable Interest Entity, Primary Beneficiary | Sabine | SWEPCo |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Current Assets | 3.1 |  | 6.0 |  |  |
Net Property, Plant and Equipment | 0.0 |  | 0.0 |  |  |
Other Noncurrent Assets | 97.1 |  | 110.8 |  |  |
TOTAL ASSETS | 100.2 |  | 116.8 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Current Liabilities | 16.6 |  | 20.1 |  |  |
Noncurrent Liabilities | 83.4 |  | 96.3 |  |  |
Equity | 0.2 |  | 0.4 |  |  |
TOTAL LIABILITIES, MEZZANINE EQUITY AND TOTAL EQUITY | 100.2 |  | 116.8 |  |  |
Variable Interest Entity, Primary Beneficiary | DCC Fuel | I&M |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Current Assets | 95.0 |  | 79.3 |  |  |
Net Property, Plant and Equipment | 181.1 |  | 132.3 |  |  |
Other Noncurrent Assets | 98.1 |  | 63.6 |  |  |
TOTAL ASSETS | 374.2 |  | 275.2 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Current Liabilities | 94.8 |  | 79.2 |  |  |
Noncurrent Liabilities | 279.4 |  | 196.0 |  |  |
Equity | 0.0 |  | 0.0 |  |  |
TOTAL LIABILITIES, MEZZANINE EQUITY AND TOTAL EQUITY | 374.2 |  | 275.2 |  |  |
Variable Interest Entity, Primary Beneficiary | AEP Texas Restoration Funding | AEP Texas |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Current Assets | 18.6 |  | 21.3 |  |  |
Net Property, Plant and Equipment | 0.0 |  | 0.0 |  |  |
Other Noncurrent Assets | 110.6 |  | 121.9 |  |  |
TOTAL ASSETS | 129.2 |  | 143.2 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Current Liabilities | 30.7 |  | 30.7 |  |  |
Noncurrent Liabilities | 97.2 |  | 111.2 |  |  |
Equity | 1.3 |  | 1.3 |  |  |
TOTAL LIABILITIES, MEZZANINE EQUITY AND TOTAL EQUITY | 129.2 |  | 143.2 |  |  |
Variable Interest Entity, Primary Beneficiary | AEP Texas Restoration Funding | AEP Texas | Intersegment Eliminations |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Other Noncurrent Assets | (1.0) |  | (1.0) |  |  |
Variable Interest Entity, Primary Beneficiary | APCo Appalachian Consumer Rate Relief Funding | AEP Texas |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Current Assets |  |  | 14.2 |  |  |
Net Property, Plant and Equipment |  |  | 0.0 |  |  |
Other Noncurrent Assets |  |  | 109.6 |  |  |
TOTAL ASSETS |  |  | 123.8 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Current Liabilities |  |  | 30.5 |  |  |
Noncurrent Liabilities |  |  | 91.4 |  |  |
Equity |  |  | 1.9 |  |  |
TOTAL LIABILITIES, MEZZANINE EQUITY AND TOTAL EQUITY |  |  | 123.8 |  |  |
Variable Interest Entity, Primary Beneficiary | APCo Appalachian Consumer Rate Relief Funding | APCo |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Current Assets | 16.0 |  |  |  |  |
Net Property, Plant and Equipment | 0.0 |  |  |  |  |
Other Noncurrent Assets | 93.7 |  |  |  |  |
TOTAL ASSETS | 109.7 |  |  |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Current Liabilities | 30.8 |  |  |  |  |
Noncurrent Liabilities | 77.0 |  |  |  |  |
Equity | 1.9 |  |  |  |  |
TOTAL LIABILITIES, MEZZANINE EQUITY AND TOTAL EQUITY | 109.7 |  |  |  |  |
Variable Interest Entity, Primary Beneficiary | Recovery Funding | SWEPCo |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Current Assets | 18.1 |  |  |  |  |
Net Property, Plant and Equipment | 0.0 |  |  |  |  |
Other Noncurrent Assets | 324.7 |  |  |  |  |
TOTAL ASSETS | 342.8 |  |  |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Current Liabilities | 28.5 |  |  |  |  |
Noncurrent Liabilities | 312.6 |  |  |  |  |
Equity | 1.7 |  |  |  |  |
TOTAL LIABILITIES, MEZZANINE EQUITY AND TOTAL EQUITY | 342.8 |  |  |  |  |
Variable Interest Entity, Primary Beneficiary | Recovery Funding | APCo |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Current Assets |  |  | 3.4 |  |  |
Net Property, Plant and Equipment |  |  | 0.0 |  |  |
Other Noncurrent Assets |  |  | 331.4 |  |  |
TOTAL ASSETS |  |  | 334.8 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Current Liabilities |  |  | 24.4 |  |  |
Noncurrent Liabilities |  |  | 308.7 |  |  |
Equity |  |  | 1.7 |  |  |
TOTAL LIABILITIES, MEZZANINE EQUITY AND TOTAL EQUITY |  |  | 334.8 |  |  |
Variable Interest Entity, Primary Beneficiary | Recovery Funding | KPCo |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Current Assets | 3.1 |  |  |  |  |
Net Property, Plant and Equipment | 0.0 |  |  |  |  |
Other Noncurrent Assets | 469.4 |  |  |  |  |
TOTAL ASSETS | 472.5 |  |  |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Current Liabilities | 10.7 |  |  |  |  |
Noncurrent Liabilities | 459.4 |  |  |  |  |
Equity | 2.4 |  |  |  |  |
TOTAL LIABILITIES, MEZZANINE EQUITY AND TOTAL EQUITY | 472.5 |  |  |  |  |
Variable Interest Entity, Primary Beneficiary | Recovery Funding | KPCo | Intersegment Eliminations |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Other Noncurrent Assets | (16.0) |  |  |  |  |
Variable Interest Entity, Primary Beneficiary | AEP Credit |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Current Assets | 1,235.0 |  | 1,118.3 |  |  |
Net Property, Plant and Equipment | 0.0 |  | 0.0 |  |  |
Other Noncurrent Assets | 10.7 |  | 10.5 |  |  |
TOTAL ASSETS | 1,245.7 |  | 1,128.8 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Current Liabilities | 1,179.5 |  | 1,068.8 |  |  |
Noncurrent Liabilities | 1.0 |  | 1.0 |  |  |
Equity | 65.2 |  | 59.0 |  |  |
TOTAL LIABILITIES, MEZZANINE EQUITY AND TOTAL EQUITY | 1,245.7 |  | 1,128.8 |  |  |
Variable Interest Entity, Primary Beneficiary | Protected Cell of EIS |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Current Assets | 209.9 |  | 218.5 |  |  |
Net Property, Plant and Equipment | 0.0 |  | 0.0 |  |  |
Other Noncurrent Assets | 0.0 |  | 0.0 |  |  |
TOTAL ASSETS | 209.9 |  | 218.5 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Current Liabilities | 46.6 |  | 54.7 |  |  |
Noncurrent Liabilities | 105.6 |  | 96.0 |  |  |
Equity | 57.7 |  | 67.8 |  |  |
TOTAL LIABILITIES, MEZZANINE EQUITY AND TOTAL EQUITY | 209.9 |  | 218.5 |  |  |
Variable Interest Entity, Primary Beneficiary | Transource Energy |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Current Assets | 58.6 |  | 40.2 |  |  |
Net Property, Plant and Equipment | 621.8 |  | 598.3 |  |  |
Other Noncurrent Assets | 7.9 |  | 3.5 |  |  |
TOTAL ASSETS | 688.3 |  | 642.0 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Current Liabilities | 30.1 |  | 57.2 |  |  |
Noncurrent Liabilities | 333.1 |  | 274.3 |  |  |
Equity | 325.1 |  | 310.5 |  |  |
TOTAL LIABILITIES, MEZZANINE EQUITY AND TOTAL EQUITY | 688.3 |  | 642.0 |  |  |
Variable Interest Entity, Primary Beneficiary | AEP Texas Restoration Funding | AEP Texas | Intersegment Eliminations |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Other Noncurrent Assets | $ (5.0) |  | $ (5.0) |  |  |

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