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DERIVATIVES AND HEDGING - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Cash collateral received from third-parties | $ 71 | $ 87
Fair value of derivative liabilities subject to cross acceleration provisions | 49 | 72
Fair value of derivative liabilities subject to cross default provisions | 161 | 164
APCo |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Fair value of derivative liabilities subject to cross default provisions | 2 | 1
PSO |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Fair value of derivative liabilities subject to cross default provisions | 15 | 4
SWEPCo |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Fair value of derivative liabilities subject to cross default provisions | $ 4 | $ 2
Commodity |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Maximum length of time to hedge exposure to variability | 10 years |
Cross acceleration provisions maximum third party obligation amount | $ 50 |
Cross default provisions maximum third party obligation amount | $ 50 |

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