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Financings And Capitalization (Narrative) (Details) |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 01, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) | Jun. 30, 2021 USD ($)
Financing And Capitalization [Line Items] |  |  |
Limitation on payment of stock dividends |  |  | $ 5,800,000,000
Dividends paid |  |  | 380,000,000
Stock offering program maximum value |  |  | 500,000,000
Series C Preferred Stock Depositary Shares | Subsequent Event |  |  |
Financing And Capitalization [Line Items] |  |  |
Depositary share conversion ratio | 0.001 |  |
Number of shares issued (in shares) | shares | 9,200,000 |  |
Issue price (in dollars per share) | $ / shares | $ 25.00 |  |
Proceeds from issuance of preferred stock | $ 224,000,000 |  |
Dividend rate | 4.20% |  |
Optional redemption price (in dollars per share) | $ / shares | $ 25.00 |  |
Series C Preferred Stock | Subsequent Event |  |  |
Financing And Capitalization [Line Items] |  |  |
Optional redemption price (in dollars per share) | $ / shares | $ 25,000 |  |
Consumers Energy Company |  |  |
Financing And Capitalization [Line Items] |  |  |
Notes payable – related parties |  | $ 307,000,000 | 0
Unrestricted retained earnings |  |  | 1,800,000,000
Consumers Energy Company | Credit Agreement |  |  |
Financing And Capitalization [Line Items] |  |  |
Maximum borrowing capacity |  | $ 350,000,000 |
Notes payable – related parties |  |  | 0
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

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