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Related party Transactions - Consumers (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Consumers Energy Company |  |  |
Related Party Transaction [Line Items] |  |  |
Purchased power – related parties | $ 71 | $ 75 | $ 76
Consumers Energy Company | Related Party |  |  |
Related Party Transaction [Line Items] |  |  |
Due to related parties | 20 | 19 |
Accounts receivable related parties | 15 | 9 |
Interest payable | 7 | $ 3 |
Consumers Energy Company | Credit Agreement | Related Party |  |  |
Related Party Transaction [Line Items] |  |  |
Maximum borrowing capacity | $ 500 |  |
CMS Energy Note Payable |  |  |
Related Party Transaction [Line Items] |  |  |
Interest Rate (%) | 4.10% |  |
CMS Energy Note Payable | Consumers Energy Company |  |  |
Related Party Transaction [Line Items] |  |  |
Interest Rate (%) | 4.10% |  |

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