Regulatory Matters - Quarterly Narrative (Details) - USD ($) $ in Millions	1 Months Ended
	Jan. 31, 2023	Apr. 27, 2023	Mar. 31, 2023	Dec. 31, 2022
Public Utilities, General Disclosures [Line Items]
Regulatory liabilities			$ 107	$ 104
Consumers Energy Company
Public Utilities, General Disclosures [Line Items]
Regulatory liabilities			$ 107	104
Consumers Energy Company | Electric Rate Case
Public Utilities, General Disclosures [Line Items]
Additional annual rate increase authorized	$ 155
Rate of return on equity authorized	9.90%
Surcharge for the recovery of excess distribution investments	$ 6
Consumers Energy Company | Voluntary refund mechanism
Public Utilities, General Disclosures [Line Items]
Regulatory liabilities				$ 22
Consumers Energy Company | Contributions to programs assisting vulnerable customers | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Regulatory liabilities		$ 5
Consumers Energy Company | Direct benefit to customers | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Regulatory liabilities		$ 17