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Income Taxes (Schedule of Reconciliation of Uncertain Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance at beginning of period | $ 26 | $ 28 | $ 27
Additions for current-year tax positions | 1 | 1 | 1
Additions for prior-year tax positions | 2 | 0 | 1
Reductions for prior-year tax positions | 0 | 0 | (1)
Reductions for lapse of statute of limitations | (5) | (3) | 0
Balance at end of period | 24 | 26 | 28
Consumers Energy Company |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance at beginning of period | 36 | 36 | 34
Additions for current-year tax positions | 6 | 1 | 3
Additions for prior-year tax positions | 1 | 2 | 1
Reductions for prior-year tax positions | 0 | 0 | (2)
Reductions for lapse of statute of limitations | (11) | (3) | 0
Balance at end of period | $ 32 | $ 36 | $ 36

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