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Leases (Schedule of Lease Cost) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Lessee, Lease, Description [Line Items] |  |
Operating lease costs | $ 6 | $ 6
Finance lease costs |  |
Amortization of right-of-use assets | 6 | 9
Interest on lease liabilities | 16 | 15
Variable lease costs | 107 | 107
Short-term lease costs | 13 | 14
Total lease costs | 148 | 151
Consumers Energy Company |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease costs | 5 | 5
Finance lease costs |  |
Amortization of right-of-use assets | 5 | 8
Interest on lease liabilities | 13 | 13
Variable lease costs | 107 | 107
Short-term lease costs | 12 | 14
Total lease costs | $ 142 | $ 147

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