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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | $ 7,075 | $ 6,238 | $ 6,403
Leasing income |  |  |  |  |  |  |  |  | 194 | 148 | 174
Financing income |  |  |  |  |  |  |  |  | 15 | 17 | 14
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 45 | 43 | 33
Consumers revenues to be refunded |  |  |  |  |  |  |  |  |  | (28) |
Total operating revenue | $ 2,033 | $ 1,725 | $ 1,558 | $ 2,013 | $ 1,727 | $ 1,507 | $ 1,382 | $ 1,802 | 7,329 | 6,418 | 6,624
Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 4,915 | 4,348 | 4,407
Financing income |  |  |  |  |  |  |  |  | 10 | 11 | 9
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 33 | 29 | 23
Consumers revenues to be refunded |  |  |  |  |  |  |  |  |  | (16) |
Total operating revenue |  |  |  |  |  |  |  |  | 4,958 | 4,372 | 4,439
Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 2,046 | 1,809 | 1,922
Financing income |  |  |  |  |  |  |  |  | 5 | 6 | 5
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 12 | 14 | 10
Consumers revenues to be refunded |  |  |  |  |  |  |  |  |  | (12) |
Total operating revenue |  |  |  |  |  |  |  |  | 2,063 | 1,817 | 1,937
Enterprises | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 114 | 81 | 74
Leasing income |  |  |  |  |  |  |  |  | 194 | 148 | 174
Total operating revenue |  |  |  |  |  |  |  |  | 308 | 229 | 248
Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 6,961 | 6,157 | 6,329
Financing income |  |  |  |  |  |  |  |  | 15 | 17 | 14
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 45 | 43 | 33
Consumers revenues to be refunded |  |  |  |  |  |  |  |  |  | (28) |
Total operating revenue |  |  |  |  |  |  |  |  | 7,021 | 6,189 | 6,376
Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 4,915 | 4,348 | 4,407
Financing income |  |  |  |  |  |  |  |  | 10 | 11 | 9
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 33 | 29 | 23
Consumers revenues to be refunded |  |  |  |  |  |  |  |  |  | (16) |
Total operating revenue |  |  |  |  |  |  |  |  | 4,958 | 4,372 | 4,439
Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 2,046 | 1,809 | 1,922
Financing income |  |  |  |  |  |  |  |  | 5 | 6 | 5
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 12 | 14 | 10
Consumers revenues to be refunded |  |  |  |  |  |  |  |  |  | (12) |
Total operating revenue |  |  |  |  |  |  |  |  | 2,063 | 1,817 | 1,937
Residential | Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 3,798 | 3,341 | 3,304
Residential | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 2,402 | 2,109 | 1,988
Residential | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 1,396 | 1,232 | 1,316
Commercial | Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 1,969 | 1,781 | 1,874
Commercial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 1,573 | 1,444 | 1,502
Commercial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 396 | 337 | 372
Industrial | Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 678 | 616 | 720
Industrial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 624 | 570 | 669
Industrial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 54 | 46 | 51
Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 114 | 81 | 74
Other | Enterprises | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 114 | 81 | 74
Other | Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 516 | 419 | 431
Other | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 316 | 225 | 248
Other | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | $ 200 | $ 194 | $ 183

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