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Related party Transactions - Consumers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Consumers Energy Company
Related Party Transaction [Line Items]
Purchased power – related parties	$ 71	$ 75	$ 76
Consumers Energy Company \| Related Party
Related Party Transaction [Line Items]
Due to related parties	20	19
Accounts receivable related parties	15	9
Interest payable	7	$ 3
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%