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New Accounting Standards (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Unamortized debt issuance costs | $ 41 |  |
Current deferred tax liabilities |  | $ 66 |
Unrealized gain (loss) on investments, net of tax | 3 | 1 | $ 2
Consumers Energy Company [Member] |  |  |
Unamortized debt issuance costs | 23 |  |
Current deferred tax liabilities |  | 80 |
Unrealized gain (loss) on investments, net of tax | $ 1 | $ (4) | $ (1)

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