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Financings and Capitalization (Schedule of Debt Maturities) (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]  
2022 $ 373
2023 663
2024 592
2025 332
2026 332
CMS Energy  
Debt Instrument [Line Items]  
2022 0
2023 0
2024 250
2025 250
2026 300
CMS Enterprises Including Subsidiaries  
Debt Instrument [Line Items]  
2022 8
2023 9
2024 10
2025 51
2026 0
Consumers Energy Company  
Debt Instrument [Line Items]  
2022 365
2023 654
2024 332
2025 31
2026 $ 32