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RATE MATTERS - I&M Rate Matters (Details) - I&M - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Apr. 30, 2025 | Jan. 31, 2025
Public Utilities, General Disclosures [Line Items] |  |  |  |
Earning test, over-earning credit to customers, proposed |  |  |  | $ 21
Subsequent Event |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Earning test, over-earning credit to customers, approved |  |  | $ 21 |
2023 Michigan Power Supply Cost Recovery |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Public utilities, recommended disallowance purchased power | $ 12 |  |  |
2023 Michigan Power Supply Cost Recovery | Minimum |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Public utilities, recommended disallowance purchased power |  | $ 3 |  |
2023 Michigan Power Supply Cost Recovery | Maximum |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Public utilities, recommended disallowance purchased power |  | $ 15 |  |

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