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Revenue (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |  |  |
Unbilled receivables | $ 339 |  | $ 339 |  | $ 663
Incentive revenue collection period | 24 months |  | 24 months |  |
Consumers Energy Company |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Unbilled receivables | $ 339 |  | $ 339 |  | $ 663
Accounts Receivable |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Bad debt expense | 8 | $ 14 | 17 | $ 18 |
Accounts Receivable | Consumers Energy Company |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Bad debt expense | $ 8 | $ 14 | $ 17 | $ 18 |

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