v3.25.4

Financings and Capitalization (First Mortgage Bond Purchase) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Payment for purchase of first mortgage bonds	$ 1,150	$ 952	$ 2,132
Interest on long-term debt	798	700	616
Consumers Energy Company
Debt Instrument [Line Items]
Payment for purchase of first mortgage bonds	115	389	1,654
Interest on long-term debt	521	488	415
First mortgage bonds
Debt Instrument [Line Items]
Gain on extinguishment of debt	72	110	131
First mortgage bonds | Consumers Energy Company | Repurchased Debt
Debt Instrument [Line Items]
Interest on long-term debt	28	19	5
First mortgage bonds | Related Party
Debt Instrument [Line Items]
Principal (In Millions)	184	404	431
Payment for purchase of first mortgage bonds	$ 109	$ 289	$ 293

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