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Financings and Capitalization (Debt Maturities) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]  
2021 $ 1,486
2022 608
2023 1,140
2024 917
2025 576
EnerBank  
Debt Instrument [Line Items]  
2021 915
2022 572
2023 477
2024 325
2025 244
CMS Energy  
Debt Instrument [Line Items]  
2021 200
2022 0
2023 0
2024 250
2025 250
CMS Enterprises Including Subsidiaries  
Debt Instrument [Line Items]  
2021 7
2022 8
2023 9
2024 10
2025 51
Consumers Energy Company  
Debt Instrument [Line Items]  
2021 364
2022 28
2023 654
2024 332
2025 $ 31