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Related party Transactions - Consumers (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Consumers Energy Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Purchased power – related parties |  | $ 75 | $ 76 | $ 77
Long-term purchase commitment, amount | $ 20 |  |  |
Consumers Energy Company | Related Party |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Due to related parties |  | 19 | 20 |
Accounts receivable related parties |  | 9 | $ 8 |
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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