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Revenue (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Disaggregation of Revenue [Line Items] |  |  |  |  |
Bad debt expense | $ 7 | $ 15 | $ 24 | $ 32 |
Unbilled receivables | 391 |  | 391 |  | $ 494
Consumers Energy Company |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Bad debt expense | 7 | $ 15 | 24 | $ 32 |
Unbilled receivables | $ 391 |  | $ 391 |  | $ 494

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