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Revenue (Components Of Operating Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | $ 1,468 | $ 1,442 | $ 4,569 | $ 4,746
Leasing income | 36 | 42 | 110 | 132
Financing income | 71 | 62 | 203 | 172
Total operating revenue | 1,575 | 1,546 | 4,882 | 5,050
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 21 | 17 | 57 | 52
Consumers Energy Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,447 | 1,425 | 4,512 | 4,694
Financing income | 3 | 4 | 12 | 12
Total operating revenue | 1,450 | 1,429 | 4,524 | 4,706
Consumers Energy Company | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 744 | 696 | 2,431 | 2,429
Consumers Energy Company | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 440 | 454 | 1,320 | 1,399
Consumers Energy Company | Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 166 | 178 | 459 | 547
Consumers Energy Company | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 97 | 97 | 302 | 319
Operating Segments | Electric Utility |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,255 | 1,247 | 3,300 | 3,373
Financing income | 2 | 3 | 7 | 7
Total operating revenue | 1,257 | 1,250 | 3,307 | 3,380
Operating Segments | Gas Utility |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 192 | 178 | 1,212 | 1,321
Financing income | 1 | 1 | 5 | 5
Total operating revenue | 193 | 179 | 1,217 | 1,326
Operating Segments | Enterprises |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 21 | 17 | 57 | 52
Leasing income | 36 | 42 | 110 | 132
Total operating revenue | 57 | 59 | 167 | 184
Variable lease income | 23 | 28 | 69 | 91
Operating Segments | Enterprises | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 21 | 17 | 57 | 52
Operating Segments | EnerBank |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Financing income | 68 | 58 | 191 | 160
Total operating revenue | 68 | 58 | 191 | 160
Operating Segments | Consumers Energy Company | Electric Utility |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 1,255 | 1,247 | 3,300 | 3,373
Financing income | 2 | 3 | 7 | 7
Total operating revenue | 1,257 | 1,250 | 3,307 | 3,380
Operating Segments | Consumers Energy Company | Electric Utility | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 624 | 585 | 1,612 | 1,531
Operating Segments | Consumers Energy Company | Electric Utility | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 413 | 427 | 1,093 | 1,140
Operating Segments | Consumers Energy Company | Electric Utility | Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 161 | 175 | 427 | 511
Operating Segments | Consumers Energy Company | Electric Utility | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 57 | 60 | 168 | 191
Operating Segments | Consumers Energy Company | Gas Utility |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 192 | 178 | 1,212 | 1,321
Financing income | 1 | 1 | 5 | 5
Total operating revenue | 193 | 179 | 1,217 | 1,326
Operating Segments | Consumers Energy Company | Gas Utility | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 120 | 111 | 819 | 898
Operating Segments | Consumers Energy Company | Gas Utility | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 27 | 27 | 227 | 259
Operating Segments | Consumers Energy Company | Gas Utility | Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | 5 | 3 | 32 | 36
Operating Segments | Consumers Energy Company | Gas Utility | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue recognized from contracts with customers | $ 40 | $ 37 | $ 134 | $ 128

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