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v3.25.3

Financings and Capitalization (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2025 | Dec. 31, 2023
Financing And Capitalization [Line Items] |  |  |  |  |
Notes payable |  | $ 65 | $ 0 | $ 0 |
Limitation on payment of stock dividends |  |  | $ 8,600 | 8,600 |
Dividends paid |  |  |  | $ 649 |
Stock offering program maximum value |  |  |  |  | $ 1,000
Number of shares (in shares) |  |  | 2,100,000 |  |
Initial forward price (in dollars per share) |  |  | $ 72.42 |  |
Shares used if elected to settle contracts (in shares) |  |  | 21,313 | 21,313 |
Cash used if elected to settle contracts |  |  | $ 2 | $ 2 |
Settlement Of Forward Contracts |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |
Shares subject to forward equity sale agreement (in shares) |  |  | 5,000,000 |  |
Settlement of forward contracts through issuance of stock (in dollars per share) |  |  | $ 70.52 | $ 70.52 |
Issuance of common stock |  |  | $ 349 |  |
Settlement Of Forward Contracts | Subsequent Event |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |
Shares subject to forward equity sale agreement (in shares) | 2,000,000 |  |  |  |
Settlement of forward contracts through issuance of stock (in dollars per share) | $ 72.73 |  |  |  |
Issuance of common stock | $ 147 |  |  |  |
Aggregate sales price | $ 8 |  |  |  |
Consumers Energy Company |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |
Notes payable |  | 65 | 0 | $ 0 |
Unrestricted retained earnings |  |  | 2,500 | 2,500 |
Consumers Energy Company | Credit Agreement | Related Party |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 500 |  |  |
Basis spread on variable rate |  | (0.10%) |  |  |
Notes payable |  |  | $ 0 | $ 0 |
NorthStar Clean Energy |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |
Supplier financing program, payment period |  |  | 135 days | 135 days |
Supplier financing program, termination period |  |  | 30 days | 30 days |
NorthStar Clean Energy | NorthStar Clean Energy's Supplier Financing Program |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration] |  |  | Accounts payable | Accounts payable |
Supplier finance obligations |  |  | $ 79 | $ 79 |
Commercial Paper | Consumers Energy Company |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |
Short-term debt authorized borrowings |  |  |  | 500 |
Short-term borrowings outstanding |  |  | $ 0 | $ 0 |

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