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Income Taxes (Significant Components Of Income Tax Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
State and Local | $ 24 | $ 24 | $ 34
Total Current Income Tax Expense | 24 | 24 | 34
Federal, deferred income taxes | 192 | 198 | 248
State and Local, deferred income taxes | 36 | 31 | 23
Total Deferred Income Tax Expense | 228 | 229 | 271
Deferred income tax credit | 19 | (3) | (3)
Tax Expense | 271 | 250 | 302
Consumers Energy Company [Member] |  |  |
Federal | 66 | 8 | 137
State and Local | 32 | 36 | 45
Total Current Income Tax Expense | 98 | 44 | 182
Federal, deferred income taxes | 153 | 236 | 147
State and Local, deferred income taxes | 32 | 29 | 20
Total Deferred Income Tax Expense | 185 | 265 | 167
Deferred income tax credit | 19 | (3) | (3)
Tax Expense | $ 302 | $ 306 | $ 346

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