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Financings and Capitalization (Debt Maturities) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]  
2020 $ 1,111
2021 538
2022 1,354
2023 669
2024 808
Consumers Energy Company  
Debt Instrument [Line Items]  
2020 202
2021 27
2022 653
2023 354
2024 $ 332