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Financings and Capitalization (Debt Maturities) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Long-term debt maturities, 2017 $ 864
Long-term debt maturities, 2018 975
Long-term debt maturities, 2019 1,326
Long-term debt maturities, 2020 850
Long-term debt maturities, 2021 103
Consumers Energy Company [Member]  
Long-term debt maturities, 2017 375
Long-term debt maturities, 2018 523
Long-term debt maturities, 2019 876
Long-term debt maturities, 2020 426
Long-term debt maturities, 2021 $ 27