Financings and Capitalization (Schedule of Debt Maturities) (Details) $ in Millions	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
2025	$ 1,192
2026	537
2027	1,038
2028	1,643
2029	1,256
CMS Energy
Debt Instrument [Line Items]
2025	740
2026	300
2027	625
2028	800
2029	0
NorthStar Clean Energy, Including Subsidiaries
Debt Instrument [Line Items]
2025	0
2026	0
2027	150
2028	0
2029	0
Consumers Energy Company
Debt Instrument [Line Items]
2025	452
2026	237
2027	263
2028	843
2029	$ 1,256