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v3.19.3.a.u2

Revenue (Components of Operating Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | $ 6,403 | $ 6,502 |
Leasing income |  |  |  |  |  |  |  |  | 174 |  |
Leasing income |  |  |  |  |  |  |  |  |  | 160 |
Financing income |  |  |  |  |  |  |  |  | 235 | 172 |
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 33 | 39 |
Total operating revenue | $ 1,795 | $ 1,546 | $ 1,445 | $ 2,059 | $ 1,829 | $ 1,599 | $ 1,492 | $ 1,953 | 6,845 | 6,873 | $ 6,583
Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 4,407 | 4,528 |
Financing income |  |  |  |  |  |  |  |  | 9 | 10 |
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 23 | 23 |
Total operating revenue |  |  |  |  |  |  |  |  | 4,439 | 4,561 | 4,448
Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 1,922 | 1,882 |
Financing income |  |  |  |  |  |  |  |  | 5 | 5 |
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 10 | 16 |
Total operating revenue |  |  |  |  |  |  |  |  | 1,937 | 1,903 | 1,774
Enterprises | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 74 | 92 |
Leasing income |  |  |  |  |  |  |  |  | 174 |  |
Leasing income |  |  |  |  |  |  |  |  |  | 160 |
Total operating revenue |  |  |  |  |  |  |  |  | 248 | 252 | 229
EnerBank | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Financing income |  |  |  |  |  |  |  |  | 221 | 157 |
Total operating revenue |  |  |  |  |  |  |  |  | 221 | 157 | 132
Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 6,329 | 6,410 |
Financing income |  |  |  |  |  |  |  |  | 14 | 15 |
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 33 | 39 |
Total operating revenue | $ 1,670 | $ 1,429 | $ 1,334 | $ 1,943 | $ 1,712 | $ 1,502 | $ 1,395 | $ 1,855 | 6,376 | 6,464 | 6,222
Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 4,407 | 4,528 |
Financing income |  |  |  |  |  |  |  |  | 9 | 10 |
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 23 | 23 |
Total operating revenue |  |  |  |  |  |  |  |  | 4,439 | 4,561 | 4,448
Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 1,922 | 1,882 |
Financing income |  |  |  |  |  |  |  |  | 5 | 5 |
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 10 | 16 |
Total operating revenue |  |  |  |  |  |  |  |  | 1,937 | 1,903 | $ 1,774
Consumers Energy Company | Enterprises | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenue |  |  |  |  |  |  |  |  | 0 | 0 |
Consumers Energy Company | EnerBank | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenue |  |  |  |  |  |  |  |  | 0 | 0 |
Residential | Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 3,304 | 3,333 |
Residential | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 1,988 | 2,049 |
Residential | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 1,316 | 1,284 |
Commercial | Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 1,874 | 1,912 |
Commercial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 1,502 | 1,545 |
Commercial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 372 | 367 |
Industrial | Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 720 | 729 |
Industrial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 669 | 674 |
Industrial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 51 | 55 |
Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 74 | 92 |
Other | Enterprises | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 74 | 92 |
Other | Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 431 | 436 |
Other | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 248 | 260 |
Other | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | $ 183 | $ 176 |

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