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Financings and Capitalization (Major Long-Term Debt Issuances and Retirements) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Jan. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]      
Principal (In Millions) $ 1,210    
NorthStar Clean Energy, Including Subsidiaries      
Debt Instrument [Line Items]      
Principal (In Millions) 85    
Consumers Energy Company      
Debt Instrument [Line Items]      
Principal (In Millions) 1,125    
Term loan facility | Term Loan Facility Due 2023 | NorthStar Clean Energy, Including Subsidiaries      
Debt Instrument [Line Items]      
Principal (In Millions) $ 85    
Interest rate 5.806%    
Maximum borrowing capacity     $ 185
Total principal amount outstanding $ 185    
Term loan facility | Term Loan Facility Due 2024      
Debt Instrument [Line Items]      
Principal (In Millions) 1,000    
First mortgage bonds | 4.650% First Mortgage Bonds Due March 2028 | Consumers Energy Company      
Debt Instrument [Line Items]      
Principal (In Millions) $ 425    
Interest rate 4.65%    
First mortgage bonds | 4.625% First Mortgage Bonds Due May 2033 | Consumers Energy Company      
Debt Instrument [Line Items]      
Principal (In Millions) $ 700    
Interest rate 4.625%    
First mortgage bonds | 5.251% First Mortgage Bonds | Consumers Energy Company      
Debt Instrument [Line Items]      
Principal (In Millions)   $ 400  
Weighted average interest rate   5.251%