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Income Taxes (Summary of Significant Components of Income Tax Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current income taxes      
Federal $ 5 $ 6 $ (1)
State and local 1 0 1
Total current income tax expense 6 6 0
Deferred income taxes      
Federal 107 4 49
State and local 38 65 49
Total deferred income tax expense 145 69 98
Deferred income tax credit (4) 18 (3)
Income tax expense 147 93 95
Consumers Energy Company      
Current income taxes      
Federal 3 (2) (13)
State and local 2 8 15
Total current income tax expense 5 6 2
Deferred income taxes      
Federal 117 50 103
State and local 43 66 54
Total deferred income tax expense 160 116 157
Deferred income tax credit (4) 18 (3)
Income tax expense $ 161 $ 140 $ 156