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v3.3.1.900

Financings and Capitalization (Debt Maturities) (Details) $ in Millions | Dec. 31, 2015 USD ($)
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Long-term debt maturities, 2016 | $ 684
Long-term debt maturities, 2017 | 1,010
Long-term debt maturities, 2018 | 911
Long-term debt maturities, 2019 | 1,288
Long-term debt maturities, 2020 | 801
Consumers Energy Company [Member] |
Long-term debt maturities, 2016 | 198
Long-term debt maturities, 2017 | 375
Long-term debt maturities, 2018 | 523
Long-term debt maturities, 2019 | 876
Long-term debt maturities, 2020 | $ 426

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