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Financings and Capitalization (Narrative) (Details) - USD ($)
6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Financing And Capitalization [Line Items]    
Notes payable $ 0 $ 20,000,000
Limitation on payment of stock dividends 6,900,000,000  
Dividends paid $ 305,000,000  
Consumers Energy Company    
Financing And Capitalization [Line Items]    
Supplier financing program, payment period 60 days  
Supplier financing program, termination period 30 days  
Payables under supplier finance program $ 23,000,000 1,000,000
Unrestricted retained earnings 2,000,000,000  
Consumers Energy Company | Related Party    
Financing And Capitalization [Line Items]    
Notes payable 6,000,000 75,000,000
Consumers Energy Company | Credit Agreement | Related Party    
Financing And Capitalization [Line Items]    
Maximum borrowing capacity   $ 500,000,000
Notes payable 0  
Consumers Energy Company | Credit Agreement | Subsidiaries    
Financing And Capitalization [Line Items]    
Maximum borrowing capacity 40,000,000  
Notes payable $ 6,000,000  
Interest rate at period end 6.924%  
Consumers Energy Company | Credit Agreement | Subsidiaries | SOFR    
Financing And Capitalization [Line Items]    
Basis spread on variable rate 1.75%  
Consumers Energy Company | Commercial Paper    
Financing And Capitalization [Line Items]    
Short-term debt authorized borrowings $ 500,000,000  
Short-term borrowings outstanding $ 0