Financings and Capitalization (Schedule of Preferred Stock) (Details)	12 Months Ended
	Dec. 31, 2023 $ / shares shares	Dec. 31, 2022 $ / shares shares
Debt and Equity Securities, FV-NI [Line Items]
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.01
Preferred stock authorized (in shares)	10,000,000
Consumers Energy Company
Debt and Equity Securities, FV-NI [Line Items]
Preferred stock, par value (in dollars per share) | $ / shares	$ 4.50	$ 4.50
Preferred stock authorized (in shares)	7,500,000	7,500,000
Preferred stock outstanding (in shares)	400,000	400,000
Series C Preferred Stock Depositary Shares
Debt and Equity Securities, FV-NI [Line Items]
Trading symbol	CMS PRC
Depositary share conversion ratio	0.001
Preferred stock, par value (in dollars per share) | $ / shares	$ 25	$ 25
Optional redemption price (in dollars per share) | $ / shares	$ 25	$ 25
Preferred stock authorized (in shares)	9,200,000	9,200,000
Preferred stock outstanding (in shares)	9,200,000	9,200,000
Consumers Energy Company Cumulative Preferred Stock, $100 par value: $4.50 Series
Debt and Equity Securities, FV-NI [Line Items]
Trading symbol	CMS-PB
Preferred Stock $4.50 Series | Consumers Energy Company
Debt and Equity Securities, FV-NI [Line Items]
Preferred stock, par value (in dollars per share) | $ / shares	$ 100	$ 100
Optional redemption price (in dollars per share) | $ / shares	$ 110	$ 110
Preferred stock authorized (in shares)	7,500,000	7,500,000
Preferred stock outstanding (in shares)	373,148	373,148