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v3.24.0.1

Financings and Capitalization (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2024 | Dec. 31, 2023 | Nov. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing And Capitalization [Line Items] |  |  |  |  |  |
Notes payable |  | $ 93 |  | $ 93 | $ 20 |
Limitation on payment of stock dividends |  | $ 7,300 |  | 7,300 |  |
Dividends paid |  |  |  | $ 695 |  |
Common stock authorized (in shares) |  | 350,000,000.0 |  | 350,000,000.0 | 350,000,000.0 |
Common stock, par value (in dollars per share) |  | $ 0.01 |  | $ 0.01 |  |
Preferred stock authorized (in shares) |  | 10,000,000 |  | 10,000,000 |  |
Preferred stock, par value (in dollars per share) |  | $ 0.01 |  | $ 0.01 |  |
Stock offering program maximum value |  |  |  | $ 1,000 |  |
Issuance of common stock |  |  |  | 192 | $ 69 | $ 26
CMS Energy |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |
Issuance of common stock |  |  |  | 192 | 69 | $ 26
Settlement Of Forward Contracts |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |
Settlement of forward contracts through issuance of stock (in dollars per share) |  |  | $ 68.05 |  |  |
Issuance of common stock |  |  | $ 178 |  |  |
Settlement Of Forward Contracts | Subsequent Event |  |  |  |  |  |
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] |  |  |  |  |  |
Payables under supplier finance program |  | $ 0 |  | 0 | $ 1 |
Unrestricted retained earnings |  | $ 2,100 |  | $ 2,100 |  |
Common stock authorized (in shares) |  | 125,000,000.0 |  | 125,000,000.0 | 125,000,000.0 |
Preferred stock authorized (in shares) |  | 7,500,000 |  | 7,500,000 | 7,500,000 |
Preferred stock, par value (in dollars per share) |  | $ 4.50 |  | $ 4.50 | $ 4.50 |
Consumers Energy Company | Consumers' Supplier Financing Program |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |
Supplier financing program, payment period |  | 60 days |  | 60 days |  |
Supplier financing program, termination period |  | 30 days |  | 30 days |  |
Consumers Energy Company | Related Party |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |
Notes payable |  | $ 0 |  | $ 0 | $ 75 |
Consumers Energy Company | Credit Agreement | Related Party |  |  |  |  |  |
Financing And Capitalization [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  | 500 |  | 500 |  |
Notes payable |  | $ 0 |  | 0 |  |
Consumers Energy Company | Credit Agreement | Related Party | SOFR |  |  |  |  |  |
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 |  |
Short-term borrowings outstanding |  | $ 93 |  | $ 93 |  |
Weighted average interest rate |  | 5.609% |  | 5.609% |  |

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