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Income Taxes (Significant Components Of Income Tax Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current income taxes |  |  |
Federal | $ (67) | $ 0 | $ 0
State and local | 0 | 6 | 9
Total Current Income Tax Expense | (67) | 6 | 9
Deferred income taxes |  |  |
Federal | 112 | 368 | 200
State and local | 58 | 36 | 47
Total Deferred Income Tax Expense | 170 | 404 | 247
Deferred income tax credit | 12 | 14 | 17
Tax expense | 115 | 424 | 273
Consumers Energy Company |  |  |
Current income taxes |  |  |
Federal | 6 | 159 | 9
State and local | 13 | 17 | 22
Total Current Income Tax Expense | 19 | 176 | 31
Deferred income taxes |  |  |
Federal | 60 | 120 | 227
State and local | 51 | 29 | 45
Total Deferred Income Tax Expense | 111 | 149 | 272
Deferred income tax credit | 12 | 14 | 17
Tax expense | $ 142 | $ 339 | $ 320

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