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Financings and Capitalization (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2024
Dec. 31, 2023
Nov. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing And Capitalization [Line Items]            
Notes payable   $ 93   $ 93 $ 20  
Limitation on payment of stock dividends   $ 7,300   7,300    
Dividends paid       $ 695    
Common stock authorized (in shares)   350,000,000.0   350,000,000.0 350,000,000.0  
Common stock, par value (in dollars per share)   $ 0.01   $ 0.01    
Preferred stock authorized (in shares)   10,000,000   10,000,000    
Preferred stock, par value (in dollars per share)   $ 0.01   $ 0.01    
Stock offering program maximum value       $ 1,000    
Issuance of common stock       192 $ 69 $ 26
CMS Energy            
Financing And Capitalization [Line Items]            
Issuance of common stock       192 69 $ 26
Settlement Of Forward Contracts            
Financing And Capitalization [Line Items]            
Settlement of forward contracts through issuance of stock (in dollars per share)     $ 68.05      
Issuance of common stock     $ 178      
Settlement Of Forward Contracts | Subsequent Event            
Financing And Capitalization [Line Items]            
Settlement of forward contracts through issuance of stock (in dollars per share) $ 70.31          
Issuance of common stock $ 266          
Consumers Energy Company            
Financing And Capitalization [Line Items]            
Payables under supplier finance program   $ 0   0 $ 1  
Unrestricted retained earnings   $ 2,100   $ 2,100    
Common stock authorized (in shares)   125,000,000.0   125,000,000.0 125,000,000.0  
Preferred stock authorized (in shares)   7,500,000   7,500,000 7,500,000  
Preferred stock, par value (in dollars per share)   $ 4.50   $ 4.50 $ 4.50  
Consumers Energy Company | Consumers' Supplier Financing Program            
Financing And Capitalization [Line Items]            
Supplier financing program, payment period   60 days   60 days    
Supplier financing program, termination period   30 days   30 days    
Consumers Energy Company | Related Party            
Financing And Capitalization [Line Items]            
Notes payable   $ 0   $ 0 $ 75  
Consumers Energy Company | Credit Agreement | Related Party            
Financing And Capitalization [Line Items]            
Maximum borrowing capacity   500   500    
Notes payable   $ 0   0    
Consumers Energy Company | Credit Agreement | Related Party | SOFR            
Financing And Capitalization [Line Items]            
Basis spread on variable rate   (0.10%)        
Consumers Energy Company | Commercial Paper            
Financing And Capitalization [Line Items]            
Short-term debt authorized borrowings       500    
Short-term borrowings outstanding   $ 93   $ 93    
Weighted average interest rate   5.609%   5.609%