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Other Income and Other Expense (Summary of Components of Other Income and Other Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other Income and Expenses [Line Items] |  |  |
Allowance for equity funds used during construction | $ 29 | $ 7 | $ 6
Income from equity method investees | 7 | 7 | 3
All other | 11 | 13 | 5
Other income | 207 | 195 | 19
Donations | (18) | (1) | (9)
Civic and political expenditures | (5) | (5) | (6)
All other | (9) | (7) | (12)
Total other expense | (32) | (13) | (27)
First mortgage bonds |  |  |
Other Income and Expenses [Line Items] |  |  |
Gain on extinguishment of debt | 110 | 131 | 0
Nonrelated Party |  |  |
Other Income and Expenses [Line Items] |  |  |
Interest income | 50 | 37 | 5
Consumers Energy Company |  |  |
Other Income and Expenses [Line Items] |  |  |
Allowance for equity funds used during construction | 29 | 7 | 6
All other | 9 | 12 | 4
Other income | 85 | 49 | 17
Donations | (18) | (1) | (9)
Civic and political expenditures | (5) | (5) | (6)
All other | (7) | (6) | (10)
Total other expense | (30) | (12) | (25)
Consumers Energy Company | Nonrelated Party |  |  |
Other Income and Expenses [Line Items] |  |  |
Interest income | 42 | 25 | 2
Consumers Energy Company | Related Party |  |  |
Other Income and Expenses [Line Items] |  |  |
Interest income | $ 5 | $ 5 | $ 5

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