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Revenue (Components of Operating Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | $ 6,238 | $ 6,403 | $ 6,502
Leasing income |  |  |  |  |  |  |  |  | 148 | 174 |
Leasing income |  |  |  |  |  |  |  |  |  |  | 160
Financing income |  |  |  |  |  |  |  |  | 279 | 235 | 172
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 43 | 33 | 39
Consumers revenues to be refunded |  |  |  |  |  |  |  |  | (28) |  |
Total operating revenue | $ 1,798 | $ 1,575 | $ 1,443 | $ 1,864 | $ 1,795 | $ 1,546 | $ 1,445 | $ 2,059 | 6,680 | 6,845 | 6,873
Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 4,348 | 4,407 | 4,528
Financing income |  |  |  |  |  |  |  |  | 11 | 9 | 10
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 29 | 23 | 23
Consumers revenues to be refunded |  |  |  |  |  |  |  |  | (16) |  |
Total operating revenue |  |  |  |  |  |  |  |  | 4,372 | 4,439 | 4,561
Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 1,809 | 1,922 | 1,882
Financing income |  |  |  |  |  |  |  |  | 6 | 5 | 5
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 14 | 10 | 16
Consumers revenues to be refunded |  |  |  |  |  |  |  |  | (12) |  |
Total operating revenue |  |  |  |  |  |  |  |  | 1,817 | 1,937 | 1,903
Enterprises | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 81 | 74 | 92
Leasing income |  |  |  |  |  |  |  |  | 148 | 174 |
Leasing income |  |  |  |  |  |  |  |  |  |  | 160
Total operating revenue |  |  |  |  |  |  |  |  | 229 | 248 | 252
EnerBank | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Financing income |  |  |  |  |  |  |  |  | 262 | 221 | 157
Total operating revenue |  |  |  |  |  |  |  |  | 262 | 221 | 157
Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 6,157 | 6,329 | 6,410
Financing income |  |  |  |  |  |  |  |  | 17 | 14 | 15
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 43 | 33 | 39
Consumers revenues to be refunded |  |  |  |  |  |  |  |  | (28) |  |
Total operating revenue | $ 1,665 | $ 1,450 | $ 1,330 | $ 1,744 | $ 1,670 | $ 1,429 | $ 1,334 | $ 1,943 | 6,189 | 6,376 | 6,464
Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 4,348 | 4,407 | 4,528
Financing income |  |  |  |  |  |  |  |  | 11 | 9 | 10
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 29 | 23 | 23
Consumers revenues to be refunded |  |  |  |  |  |  |  |  | (16) |  |
Total operating revenue |  |  |  |  |  |  |  |  | 4,372 | 4,439 | 4,561
Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 1,809 | 1,922 | 1,882
Financing income |  |  |  |  |  |  |  |  | 6 | 5 | 5
Consumers alternative-revenue programs |  |  |  |  |  |  |  |  | 14 | 10 | 16
Consumers revenues to be refunded |  |  |  |  |  |  |  |  | (12) |  |
Total operating revenue |  |  |  |  |  |  |  |  | 1,817 | 1,937 | 1,903
Residential | Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 3,341 | 3,304 | 3,333
Residential | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 2,109 | 1,988 | 2,049
Residential | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 1,232 | 1,316 | 1,284
Commercial | Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 1,781 | 1,874 | 1,912
Commercial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 1,444 | 1,502 | 1,545
Commercial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 337 | 372 | 367
Industrial | Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 616 | 720 | 729
Industrial | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 570 | 669 | 674
Industrial | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 46 | 51 | 55
Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 81 | 74 | 92
Other | Enterprises | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 81 | 74 | 92
Other | Consumers Energy Company |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 419 | 431 | 436
Other | Consumers Energy Company | Electric Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | 225 | 248 | 260
Other | Consumers Energy Company | Gas Utility | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  |  |  |  |  |  |  |  | $ 194 | $ 183 | $ 176

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