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Income Taxes (Significant Components Of Income Tax Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Current income taxes |  |  |
Federal | $ (35) | $ (31) | $ (67)
State and local | (2) | 28 | 0
Total Current Income Tax Expense | (37) | (3) | (67)
Deferred income taxes |  |  |
Federal | 115 | 97 | 112
State and local | 60 | 32 | 58
Total Deferred Income Tax Expense | 175 | 129 | 170
Deferred income tax credit | (5) | 21 | 12
Income tax expense | 133 | 147 | 115
Consumers Energy Company |  |  |
Current income taxes |  |  |
Federal | 3 | 107 | 6
State and local | (7) | 41 | 13
Total Current Income Tax Expense | (4) | 148 | 19
Deferred income taxes |  |  |
Federal | 115 | (10) | 60
State and local | 67 | 26 | 51
Total Deferred Income Tax Expense | 182 | 16 | 111
Deferred income tax credit | (5) | 21 | 12
Income tax expense | $ 173 | $ 185 | $ 142

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