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Regulatory Matters (Schedule of Liabilities for PSCR and GCR Overrecoveries) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Public Utilities, General Disclosures [Line Items] |  |
Accrued rate refunds | $ 38 | $ 54
Consumers Energy Company |  |
Public Utilities, General Disclosures [Line Items] |  |
Accrued rate refunds | 38 | 54
Consumers Energy Company | PSCR underrecoveries |  |
Public Utilities, General Disclosures [Line Items] |  |
Accrued rate refunds | 13 | 10
Consumers Energy Company | GCR underrecoveries |  |
Public Utilities, General Disclosures [Line Items] |  |
Accrued rate refunds | $ 25 | $ 44

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