Regulatory Matters - Quarterly Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Jan. 31, 2022
Public Utilities, General Disclosures [Line Items]
Operating Revenue		$ 2,374	$ 2,013
Consumers Energy Company
Public Utilities, General Disclosures [Line Items]
Operating Revenue		2,283	$ 1,937
Consumers Energy Company | Electric Rate Case
Public Utilities, General Disclosures [Line Items]
Estimate of disallowed costs	$ 20	20
Recommended disallowed costs					$ 11
Additional annual rate increase authorized	5
Consumers Energy Company | Energy Waste Reduction Plan Incentive
Public Utilities, General Disclosures [Line Items]
Requested recovery/collection	$ 46	$ 46
Operating Revenue				$ 46