v3.25.4

Financings and Capitalization (Major Long-Term Debt Issuances and Retirements) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($)
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)	$ 3,458
Repayments of debt	850
Consumers Energy Company
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)	1,125
First mortgage bonds | 4.500% First Mortgage Bonds Due January 2031 | Consumers Energy Company
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)	$ 500
Interest Rate (%)	4.50%
First mortgage bonds | 5.050% First Mortgage Bonds Due May 2035 | Consumers Energy Company
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)	$ 625
Interest Rate (%)	5.05%
CMS Energy
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)	$ 2,110
Repayments of debt	850
CMS Energy | Junior subordinated notes | 6.500% Junior Subordinated Notes Due June 2055
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)	$ 1,000
Interest Rate (%)	6.50%
CMS Energy | Term loan facility | Term Loan Facility Due December 2025
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)	$ 110
Repayments of debt	200
CMS Energy | Term loan facility | Term Loan Facility Due September 2025
Debt Instrument [Line Items]
Repayments of debt	400
CMS Energy | Convertible debt | 3.125% Convertible Notes Due May 2031
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)	$ 1,000
Interest Rate (%)	3.125%
CMS Energy | Senior Notes | 3.600% Senior Notes Due November 2025
Debt Instrument [Line Items]
Interest Rate (%)	3.60%
Repayments of debt	$ 250
NorthStar Clean Energy, Including Subsidiaries
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)	223
NorthStar Clean Energy, Including Subsidiaries | Construction financing agreement | Construction Financing Agreement
Debt Instrument [Line Items]
Principal Debt Issuances (In Millions)	$ 223

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