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Financings and Capitalization (Debt Maturities) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]  
2019 $ 974
2020 1,007
2021 310
2022 1,146
2023 546
Consumers Energy Company  
Debt Instrument [Line Items]  
2019 26
2020 626
2021 27
2022 653
2023 $ 369