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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