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Revenue (Components of Operating Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | $ 1,671 | $ 1,468 | $ 5,148 | $ 4,569
Leasing income | 50 | 36 | 136 | 110
Financing income | 3 | 3 | 11 | 12
Consumers alternative-revenue programs |  |  | 1 |
Total operating revenue | 1,725 | 1,507 | 5,296 | 4,691
Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,416 | 1,255 | 3,705 | 3,300
Financing income | 2 | 2 | 7 | 7
Consumers alternative-revenue programs |  |  | 1 |
Total operating revenue | 1,419 | 1,257 | 3,713 | 3,307
Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 224 | 192 | 1,357 | 1,212
Financing income | 1 | 1 | 4 | 5
Consumers alternative-revenue programs |  |  | 0 |
Total operating revenue | 225 | 193 | 1,361 | 1,217
Enterprises | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 31 | 21 | 86 | 57
Leasing income | 50 | 36 | 136 | 110
Total operating revenue | 81 | 57 | 222 | 167
Variable lease income | 35 | 23 | 94 | 69
Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,640 | 1,447 | 5,062 | 4,512
Financing income | 3 | 3 | 11 | 12
Consumers alternative-revenue programs | 1 |  | 1 |
Total operating revenue | 1,644 | 1,450 | 5,074 | 4,524
Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,416 | 1,255 | 3,705 | 3,300
Financing income | 2 | 2 | 7 | 7
Consumers alternative-revenue programs | 1 |  | 1 |
Total operating revenue | 1,419 | 1,257 | 3,713 | 3,307
Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 224 | 192 | 1,357 | 1,212
Financing income | 1 | 1 | 4 | 5
Consumers alternative-revenue programs | 0 |  | 0 |
Total operating revenue | 225 | 193 | 1,361 | 1,217
Residential | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 861 | 744 | 2,764 | 2,431
Residential | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 718 | 624 | 1,847 | 1,612
Residential | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 143 | 120 | 917 | 819
Commercial | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 492 | 440 | 1,449 | 1,320
Commercial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 456 | 413 | 1,191 | 1,093
Commercial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 36 | 27 | 258 | 227
Industrial | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 172 | 166 | 494 | 459
Industrial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 167 | 161 | 458 | 427
Industrial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 5 | 5 | 36 | 32
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 31 | 21 | 86 | 57
Other | Enterprises | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 31 | 21 | 86 | 57
Other | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 115 | 97 | 355 | 302
Other | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 75 | 57 | 209 | 168
Other | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | $ 40 | $ 40 | $ 146 | $ 134

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