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Financings and Capitalization (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Jan. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Oct. 31, 2024
Financing And Capitalization [Line Items] |  |  |  |  |  |  |  |
Principal (In Millions) | $ 1,300 |  |  | $ 1,300 | $ 1,300 |  |  |
Payment for purchase of first mortgage bonds |  |  |  |  | 789 | $ 1,846 |  |
Notes payable | 0 |  | $ 93 | 0 | 0 |  | $ 93 |
Limitation on payment of stock dividends | 7,900 |  |  | 7,900 | 7,900 |  |  |
Dividends paid |  |  |  |  | 544 |  |  |
Stock offering program maximum value |  |  |  |  |  |  | 1,000 |
Issuance of common stock |  |  |  |  | 283 | 10 |  |
First mortgage bonds |  |  |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  | 20 | 90 |  |  |
Settlement Of Forward Contracts |  |  |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |  |  |
Settlement of forward contracts through issuance of stock (in dollars per share) |  | $ 70.31 |  |  |  |  |  |
Issuance of common stock |  | $ 266 |  |  |  |  |  |
Senior notes | Delayed Draw Unsecured Term Loan Credit Facility |  |  |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 400 |  |  | 400 | 400 |  |  |
Basis spread on variable rate | 0.85% |  |  |  |  |  |  |
Senior notes | Subsequent Event | Delayed Draw Unsecured Term Loan Credit Facility |  |  |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |  |  |
Amount borrowed |  |  |  |  |  |  |  | $ 175
Interest rate at period end |  |  |  |  |  |  |  | 5.694%
Consumers Energy Company |  |  |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |  |  |
Principal (In Millions) | $ 1,300 |  |  | 1,300 | 1,300 |  |  |
Payment for purchase of first mortgage bonds |  |  |  |  | 322 | $ 1,639 |  |
Notes payable | 0 |  | 93 | 0 | 0 |  | 93 |
Unrestricted retained earnings | 2,300 |  |  | 2,300 | 2,300 |  |  |
Consumers Energy Company | Variable Rate Revenue Bonds | Subsequent Event |  |  |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |  |  |
Principal (In Millions) |  |  |  |  |  |  |  | $ 75
Interest rate |  |  |  |  |  |  |  | 3.35%
Consumers Energy Company | Related Party | First mortgage bonds |  |  |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |  |  |
Principal (In Millions) | 311 |  |  | 311 | 311 |  |  |
Payment for purchase of first mortgage bonds |  |  |  |  | 218 |  |  |
Consumers Energy Company | Credit Agreement | Related Party |  |  |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 500 |  |  |  | $ 500 |
Basis spread on variable rate |  |  | (0.10%) |  |  |  |  |
Notes payable | 0 |  |  | 0 | 0 |  |  |
Consumers Energy Company | Commercial Paper |  |  |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |  |  |
Short-term debt authorized borrowings |  |  |  |  | 500 |  |  |
Short-term borrowings outstanding | $ 0 |  |  | $ 0 | $ 0 |  |  |

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