Related Party Transactions - Consumers (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Consumers Energy Company
Related Party Transaction [Line Items]
Purchased power – related parties		$ 76,000,000	$ 77,000,000	$ 64,000,000
Due to related parties		20,000,000	22,000,000
Accounts receivable related parties		8,000,000	$ 7,000,000
Consumers Energy Company | Enterprise Segment Generating Units
Related Party Transaction [Line Items]
Long-term purchase commitment, amount	$ 515,000,000
Consumers Energy Company | Credit Agreement
Related Party Transaction [Line Items]
Maximum borrowing capacity		$ 500,000,000
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%