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Leases and Palisades Financing - Palisades Financing (Details) - Financing Obligation - Consumers Energy Company - Palisades Power Purchase Agreement $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) MW | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2007
Other Commitments [Line Items] |  |  |  |
Finance obligation term |  |  |  | 15 years
Annual average capacity (in MW) | MW | 798 |  |  |
Amortization and interest expense | $ 14 | $ 14 | $ 15 |
Palisades asset | 3 |  |  |
Palisades financing obligation | $ 3 |  |  |

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