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Income Taxes (Significant Components Of Income Tax Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
State and Local | $ 9 | $ 24 | $ 24
Total Current Income Tax Expense | 9 | 24 | 24
Federal, deferred income taxes | 200 | 192 | 198
State and Local, deferred income taxes | 47 | 36 | 31
Total Deferred Income Tax Expense | 247 | 228 | 229
Deferred income tax credit | 17 | 19 | (3)
Tax Expense | 273 | 271 | 250
Consumers Energy Company [Member] |  |  |
Federal | 9 | 66 | 8
State and Local | 22 | 32 | 36
Total Current Income Tax Expense | 31 | 98 | 44
Federal, deferred income taxes | 227 | 153 | 236
State and Local, deferred income taxes | 45 | 32 | 29
Total Deferred Income Tax Expense | 272 | 185 | 265
Deferred income tax credit | 17 | 19 | (3)
Tax Expense | $ 320 | $ 302 | $ 306

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