Financings and Capitalization (Schedule of Debt Maturities) (Details) $ in Millions	Dec. 31, 2025 USD ($)
Debt Instrument [Line Items]
2026	$ 950
2027	888
2028	1,878
2029	1,256
2030	812
CMS Energy
Debt Instrument [Line Items]
2026	300
2027	625
2028	800
2029	0
2030	0
NorthStar Clean Energy, Including Subsidiaries
Debt Instrument [Line Items]
2026	77
2027	0
2028	235
2029	0
2030	0
Consumers Energy Company
Debt Instrument [Line Items]
2026	573
2027	263
2028	843
2029	1,256
2030	$ 812