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Income Taxes (Significant Components Of Income Tax Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current income taxes      
Federal $ (31) $ (67) $ 0
State and local 28 0 6
Total Current Income Tax Expense (3) (67) 6
Deferred income taxes      
Federal 97 112 368
State and local 32 58 36
Total Deferred Income Tax Expense 129 170 404
Deferred income tax credit 21 12 14
Tax expense 147 115 424
Consumers Energy Company      
Current income taxes      
Federal 107 6 159
State and local 41 13 17
Total Current Income Tax Expense 148 19 176
Deferred income taxes      
Federal (10) 60 120
State and local 26 51 29
Total Deferred Income Tax Expense 16 111 149
Deferred income tax credit 21 12 14
Tax expense $ 185 $ 142 $ 339