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Financings and Capitalization (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Financing And Capitalization [Line Items] |  |  |  |  |  |
Payment for purchase of first mortgage bonds |  |  |  | $ 433 | $ 1,465 |
Notes payable |  | $ 93 | $ 0 | 0 |  | $ 93
Limitation on payment of stock dividends |  |  | 7,800 | 7,800 |  |
Dividends paid |  |  |  | 359 |  |
Stock offering program maximum value |  |  |  |  |  | 1,000
Issuance of common stock |  |  |  | 279 | 7 |
First mortgage bonds |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |
Gain on extinguishment of debt |  |  | 48 | 70 |  |
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 |  |  |  |  |
Consumers Energy Company |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |
Principal (In Millions) |  |  | 600 | 600 |  |
Payment for purchase of first mortgage bonds |  |  |  | 15 | $ 1,314 |
Unrestricted retained earnings |  |  | 2,200 | 2,200 |  |
Consumers Energy Company | Related Party | First mortgage bonds |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |
Principal (In Millions) |  |  | 242 | 242 |  |
Payment for purchase of first mortgage bonds |  |  |  | 169 |  |
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 |  |
Consumers Energy Company | Commercial Paper |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |
Short-term debt authorized borrowings |  |  |  | 500 |  |
Short-term borrowings outstanding |  |  | $ 0 | $ 0 |  |

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