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Related Party Transactions - Consumers (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) MW | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Consumers Energy Company |  |  |
Related Party Transaction [Line Items] |  |  |
Purchased power – related parties | $ 77,000,000 | $ 64,000,000 | $ 75,000,000
Due to related parties | 22,000,000 | 13,000,000 |
Accounts receivable related parties | $ 7,000,000 | $ 16,000,000 |
Consumers Energy Company | Enterprise Segment Generating Units |  |  |
Related Party Transaction [Line Items] |  |  |
Nameplate capacity (in MW) | MW | 1,001 |  |
Long-term purchase commitment, amount | $ 515,000,000 |  |
Consumers Energy Company | Credit Agreement |  |  |
Related Party Transaction [Line Items] |  |  |
Interest rate | 0.00% |  |
Maximum borrowing capacity | $ 500,000,000 |  |
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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