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Revenue (Components of Operating Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | $ 1,515 | $ 1,343 | $ 3,477 | $ 3,101
Leasing income | 40 | 35 | 86 | 74
Financing income | 3 | 4 | 8 | 9
Total operating revenue | 1,558 | 1,382 | 3,571 | 3,184
Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,158 | 1,020 | 2,289 | 2,045
Financing income | 2 | 2 | 5 | 5
Total operating revenue | 1,160 | 1,022 | 2,294 | 2,050
Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 332 | 306 | 1,133 | 1,020
Financing income | 1 | 2 | 3 | 4
Total operating revenue | 333 | 308 | 1,136 | 1,024
Enterprises | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 25 | 17 | 55 | 36
Leasing income | 40 | 35 | 86 | 74
Total operating revenue | 65 | 52 | 141 | 110
Variable lease income | 26 | 21 | 59 | 46
Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,490 | 1,326 | 3,422 | 3,065
Financing income | 3 | 4 | 8 | 9
Total operating revenue | 1,493 | 1,330 | 3,430 | 3,074
Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,158 | 1,020 | 2,289 | 2,045
Financing income | 2 | 2 | 5 | 5
Total operating revenue | 1,160 | 1,022 | 2,294 | 2,050
Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 332 | 306 | 1,133 | 1,020
Financing income | 1 | 2 | 3 | 4
Total operating revenue | 333 | 308 | 1,136 | 1,024
Residential | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 781 | 713 | 1,903 | 1,687
Residential | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 561 | 507 | 1,129 | 988
Residential | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 220 | 206 | 774 | 699
Commercial | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 449 | 392 | 957 | 880
Commercial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 390 | 341 | 735 | 680
Commercial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 59 | 51 | 222 | 200
Industrial | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 161 | 133 | 322 | 293
Industrial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 153 | 126 | 291 | 266
Industrial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 8 | 7 | 31 | 27
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 25 | 17 | 55 | 36
Other | Enterprises | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 25 | 17 | 55 | 36
Other | Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 99 | 88 | 240 | 205
Other | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 54 | 46 | 134 | 111
Other | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | $ 45 | $ 42 | $ 106 | $ 94

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