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Financings And Capitalization (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended
Dec. 31, 2020
Mar. 31, 2021
Financing And Capitalization [Line Items]    
Limitation on payment of stock dividends   $ 5,700,000,000
Dividends paid   276,000,000
Stock offering program maximum value   $ 500,000,000
Number of shares required to settle forward contracts (in shares)   16,758
Consumers Energy Company    
Financing And Capitalization [Line Items]    
Notes payable – related parties $ 307,000,000 $ 57,000,000
Unrestricted retained earnings   1,700,000,000
Consumers Energy Company | Credit Agreement    
Financing And Capitalization [Line Items]    
Maximum borrowing capacity $ 350,000,000  
Notes payable – related parties   $ 57,000,000
Weighted average interest rate   0.014%
Consumers Energy Company | Credit Agreement | London Interbank Offered Rate (LIBOR)    
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   $ 500,000,000
Short-term borrowings outstanding   $ 0