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Financings and Capitalization (First Mortgage Bond Purchase) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 26, 2023
Sep. 30, 2023
Sep. 30, 2023
Aug. 31, 2023
May 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]            
Principal (In Millions)   $ 2,910 $ 2,910      
Gain on debt extinguishment   17 101      
Long-term debt   14,114 14,114     $ 13,122
Consumers Energy Company            
Debt Instrument [Line Items]            
Repayments of debt     1,625      
Principal (In Millions)   2,025 2,025      
Related Party | Consumers Energy Company            
Debt Instrument [Line Items]            
Long-term debt   294 294     $ 0
CMS Energy            
Debt Instrument [Line Items]            
Payment for purchase of first mortgage bonds     192      
Principal (In Millions)   800 800      
Term Loan Facility Due 2023 | Subsequent Event | NorthStar Clean Energy            
Debt Instrument [Line Items]            
Repayments of debt $ 66          
First mortgage bonds due 2060 | First mortgage bonds | Consumers Energy Company            
Debt Instrument [Line Items]            
Principal (In Millions)         $ 150  
Interest rate         2.50%  
First mortgage bonds due 2052 | First mortgage bonds | Consumers Energy Company            
Debt Instrument [Line Items]            
Principal (In Millions)       $ 15 $ 88  
Interest rate       2.65% 2.65%  
First mortgage bonds due 2050 | First mortgage bonds | Consumers Energy Company            
Debt Instrument [Line Items]            
Principal (In Millions)   $ 18 $ 18 $ 23    
Interest rate   3.10% 3.10% 3.75%    
First mortgage bonds due 2051 | First mortgage bonds | Consumers Energy Company            
Debt Instrument [Line Items]            
Principal (In Millions)   $ 3 $ 3      
Interest rate   3.50% 3.50%