Financings and Capitalization (Schedule of Debt Maturities) (Details) $ in Millions	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
2024	$ 975
2025	366
2026	537
2027	888
2028	1,643
CMS Energy
Debt Instrument [Line Items]
2024	250
2025	250
2026	300
2027	625
2028	800
Consumers Energy Company
Debt Instrument [Line Items]
2024	725
2025	116
2026	237
2027	263
2028	$ 843

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details