v3.25.4

Related party Transactions - Consumers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Consumers Energy Company
Related Party Transaction [Line Items]
Purchased power – related parties	$ 94	$ 71	$ 75
Consumers Energy Company | Related Party
Related Party Transaction [Line Items]
Due to related parties	19	20
Accounts receivable related parties	13	15
Interest payable	9	$ 7
Consumers Energy Company | Credit Agreement | Related Party
Related Party Transaction [Line Items]
Maximum borrowing capacity	$ 500
CMS Energy Note Payable
Related Party Transaction [Line Items]
Interest Rate (%)	4.10%
CMS Energy Note Payable | Consumers Energy Company
Related Party Transaction [Line Items]
Interest Rate (%)	4.10%

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