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Revenue (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Bad debt expense | $ 33 | $ 34 | $ 50
Unbilled receivables | 584 | 494 |
Consumers Energy Company |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Bad debt expense | 33 | 34 | 50
Regulatory liability | 4,178 | 3,950 |
Unbilled receivables | $ 584 | $ 494 |
Consumers Energy Company | Contributions to assistance programs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulatory liability |  |  | 10
Consumers Energy Company | Voluntary refund mechanism |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulatory liability |  |  | 22
Consumers Energy Company | Revenue subject to refund |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulatory liability |  |  | $ 15

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