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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Narrative (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) uncommittedFacility a unit
Other Commitments [Line Items] |  |
Number of uncommitted facilities | uncommittedFacility |  | 6
Liabilities Incurred |  | $ 17,400,000
Area of land closed, noncompliant with CCR rule | a |  | 300
CCR Rule Revision |  |
Other Commitments [Line Items] |  |
Liabilities Incurred | $ 674,000,000 |
SWEPCo |  |
Other Commitments [Line Items] |  |
Liabilities Incurred |  | $ 0
I&M | Cook Plant |  |
Other Commitments [Line Items] |  |
Nuclear contingencies, number of units | unit |  | 2
Line of Credit | Revolving Credit Facility | Revolving Credit Facility, Due March 2029 |  |
Other Commitments [Line Items] |  |
Line of credit facility, borrowing capacity |  | $ 5,000,000,000
Line of Credit | Revolving Credit Facility | Revolving Credit Facility, Due March 2027 |  |
Other Commitments [Line Items] |  |
Line of credit facility, borrowing capacity |  | 1,000,000,000
Line of Credit | Letter of Credit |  |
Other Commitments [Line Items] |  |
Debt instrument, face amount |  | 450,000,000
Line of Credit | Letter of Credit | Subsidiaries |  |
Other Commitments [Line Items] |  |
Line of credit facility, borrowing capacity |  | 1,200,000,000
Line of Credit | Letter of Credit | Revolving Credit Facility, Due March 2029 |  |
Other Commitments [Line Items] |  |
Line of credit facility, borrowing capacity |  | 0
Line of Credit | Letter of Credit | Revolving Credit Facility, Due March 2027 |  |
Other Commitments [Line Items] |  |
Line of credit facility, borrowing capacity |  | $ 0

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