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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Narrative (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) | Apr. 30, 2025 USD ($) | Mar. 31, 2025 USD ($) unit uncommittedFacility
Other Commitments [Line Items] |  |  |
Number of uncommitted facilities | uncommittedFacility |  |  | 6
CCR Rule Revision |  |  |
Other Commitments [Line Items] |  |  |
Asset retirement obligation, liabilities incurred | $ 674,000,000 |  |
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 | Subsequent Event |  |  |
Other Commitments [Line Items] |  |  |
Debt instrument, face amount |  | $ 52,000,000 |
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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