Financings and Capitalization (Schedule of Revolving Credit Facilities) (Details)	12 Months Ended
	Dec. 31, 2022 USD ($)
Consumers Energy Company | Letter of Credit
Line of Credit Facility [Line Items]
Borrowings	$ 0
Consumers Energy Company | Revolving Credit Facilities June 5, 2024
Line of Credit Facility [Line Items]
Amount of Facility	1,100,000,000
Amount Borrowed	0
Letters of Credit Outstanding	29,000,000
Amount Available	1,071,000,000
Consumers Energy Company | Revolving Credit Facilities November 19, 2023
Line of Credit Facility [Line Items]
Amount of Facility	250,000,000
Amount Borrowed	0
Letters of Credit Outstanding	27,000,000
Amount Available	223,000,000
CMS Energy | Revolving Credit Facilities June 5, 2024
Line of Credit Facility [Line Items]
Amount of Facility	550,000,000
Amount Borrowed	0
Letters of Credit Outstanding	18,000,000
Amount Available	532,000,000
CMS Energy | Revolving Credit Facilities June 5, 2024 | Letter of Credit
Line of Credit Facility [Line Items]
Borrowings	0
CMS Energy | Revolving Credit Facilities September 22, 2022
Line of Credit Facility [Line Items]
Amount of Facility	50,000,000
Amount Borrowed	0
Letters of Credit Outstanding	50,000,000
Amount Available	0
NorthStar Clean Energy, Including Subsidiaries | Revolving Credit Facilities September 25, 2025
Line of Credit Facility [Line Items]
Amount of Facility	37,000,000
Amount Borrowed	0
Letters of Credit Outstanding	37,000,000
Amount Available	$ 0