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Financings and Capitalization (Narrative) (Details) - USD ($)
1 Months Ended 9 Months Ended
Dec. 31, 2022
Sep. 30, 2023
Financing And Capitalization [Line Items]    
Notes payable $ 20,000,000 $ 247,000,000
Limitation on payment of stock dividends   7,000,000,000
Dividends paid   $ 461,000,000
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 1,000,000 $ 0
Unrestricted retained earnings   2,000,000,000
Consumers Energy Company | Related Party    
Financing And Capitalization [Line Items]    
Notes payable 75,000,000 75,000,000
Consumers Energy Company | Credit Agreement | Related Party    
Financing And Capitalization [Line Items]    
Maximum borrowing capacity $ 500,000,000  
Notes payable   $ 63,000,000
Interest rate at period end   5.218%
Consumers Energy Company | Credit Agreement | Related Party | SOFR    
Financing And Capitalization [Line Items]    
Basis spread on variable rate (0.10%)  
Consumers Energy Company | Credit Agreement | Subsidiaries    
Financing And Capitalization [Line Items]    
Maximum borrowing capacity   $ 40,000,000
Notes payable   $ 12,000,000
Interest rate at period end   7.079%
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   $ 247,000,000
Interest rate   5.529%