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Regulatory Matters - (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended
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May 31, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | May 31, 2023
Public Utilities, General Disclosures [Line Items] |  |  |  |
Settlement agreement penalty payment | $ 1 |  |  |
Minimum settlement returns to customers | $ 3 |  |  |
Electric Rate Case | Consumers Energy Company |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Requested annual rate increase |  |  |  | $ 216
Requested annual rate increase, as a percent |  |  |  | 10.25%
Amended requested annual rate increase |  |  | $ 169 |
Additional annual rate increase authorized |  | $ 92 |  |
Surcharge for the recovery of excess distribution investments |  | $ 9 |  |
Rate of return on equity authorized |  | 9.90% |  |

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