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Financings and Capitalization (Schedule of Debt Maturities) (Details) $ in Millions | Dec. 31, 2021 USD ($)
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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

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