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Revenue (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Unbilled receivables | $ 447 |  | $ 663
Consumers Energy Company |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unbilled receivables | 447 |  | $ 663
Accounts Receivable |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Bad debt expense | 9 | $ 4 |
Accounts Receivable | Consumers Energy Company |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Bad debt expense | $ 9 | $ 4 |

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