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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | $ 1,842 | $ 1,515 | $ 4,160 | $ 3,477
Leasing income | 66 | 40 | 124 | 86
Financing income | 4 | 3 | 9 | 8
Consumers alternative-revenue programs |  |  | 1 |
Total operating revenue | 1,920 | 1,558 | 4,294 | 3,571
Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,322 | 1,158 | 2,560 | 2,289
Financing income | 2 | 2 | 5 | 5
Consumers alternative-revenue programs |  |  | 1 |
Total operating revenue | 1,325 | 1,160 | 2,566 | 2,294
Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 468 | 332 | 1,515 | 1,133
Financing income | 2 | 1 | 4 | 3
Consumers alternative-revenue programs |  |  | 0 |
Total operating revenue | 477 | 333 | 1,519 | 1,136
Enterprises | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 52 | 25 | 85 | 55
Leasing income | 66 | 40 | 124 | 86
Total operating revenue | 118 | 65 | 209 | 141
Variable lease income | 53 | 26 | 97 | 59
Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,790 | 1,490 | 4,075 | 3,422
Financing income | 4 | 3 | 9 | 8
Consumers alternative-revenue programs | 8 |  | 1 |
Total operating revenue | 1,802 | 1,493 | 4,085 | 3,430
Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,322 | 1,158 | 2,560 | 2,289
Financing income | 2 | 2 | 5 | 5
Consumers alternative-revenue programs | 1 |  | 1 |
Total operating revenue | 1,325 | 1,160 | 2,566 | 2,294
Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 468 | 332 | 1,515 | 1,133
Financing income | 2 | 1 | 4 | 3
Consumers alternative-revenue programs | 7 |  | 0 |
Total operating revenue | 477 | 333 | 1,519 | 1,136
Residential | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 906 | 781 | 2,237 | 1,903
Residential | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 597 | 561 | 1,188 | 1,129
Residential | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 309 | 220 | 1,049 | 774
Commercial | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 519 | 449 | 1,124 | 957
Commercial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 420 | 390 | 804 | 735
Commercial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 99 | 59 | 320 | 222
Industrial | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 222 | 161 | 418 | 322
Industrial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 207 | 153 | 375 | 291
Industrial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 15 | 8 | 43 | 31
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 52 | 25 | 85 | 55
Other | Enterprises | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 52 | 25 | 85 | 55
Other | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 143 | 99 | 296 | 240
Other | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 98 | 54 | 193 | 134
Other | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | $ 45 | $ 45 | $ 103 | $ 106

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