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Revenue (Components Of Operating Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | $ 1,519 |  |  | $ 4,805 |  |
Leasing income |  | 36 |  |  | 112 |  |
Financing income |  | 43 |  |  | 122 |  |
Alternative revenue programs |  | 1 |  |  | 5 |  |
Total operating revenue |  | 1,599 |  | $ 1,527 | 5,044 |  | $ 4,805
Other |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 21 |  |  | 69 |  |
Consumers Energy Company |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 1,498 |  |  | 4,736 |  |
Financing income |  | 3 |  |  | 11 |  |
Alternative revenue programs |  | 1 |  |  | 5 |  |
Total operating revenue |  | 1,502 |  | 1,437 | 4,752 |  | 4,536
Consumers Energy Company | Residential |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 743 |  |  | 2,450 |  |
Consumers Energy Company | Commercial |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 464 |  |  | 1,431 |  |
Consumers Energy Company | Industrial |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 190 |  |  | 536 |  |
Consumers Energy Company | Other |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 101 |  |  | 319 |  |
Operating Segments | Electric Utility |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 1,310 |  |  | 3,473 |  |
Financing income |  | 3 |  |  | 7 |  |
Total operating revenue |  | 1,313 |  | 1,247 | 3,480 |  | 3,360
Operating Segments | Gas Utility |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 188 |  |  | 1,263 |  |
Financing income |  | 0 |  |  | 4 |  |
Alternative revenue programs |  | 1 |  |  | 5 |  |
Total operating revenue |  | 189 |  | 190 | 1,272 |  | 1,176
Operating Segments | Enterprises |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers | [1] | 21 |  |  | 69 |  |
Leasing income | [1] | 36 |  |  | 112 |  |
Total operating revenue |  | 57 | [1] | 58 | 181 | [1] | 172
Operating Segments | Enterprises | Other |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers | [1] | 21 |  |  | 69 |  |
Operating Segments | Consumers Energy Company | Electric Utility |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 1,310 |  |  | 3,473 |  |
Financing income |  | 3 |  |  | 7 |  |
Total operating revenue |  | 1,313 |  | 1,247 | 3,480 |  | 3,360
Operating Segments | Consumers Energy Company | Electric Utility | Residential |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 625 |  |  | 1,601 |  |
Operating Segments | Consumers Energy Company | Electric Utility | Commercial |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 434 |  |  | 1,181 |  |
Operating Segments | Consumers Energy Company | Electric Utility | Industrial |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 186 |  |  | 499 |  |
Operating Segments | Consumers Energy Company | Electric Utility | Other |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 65 |  |  | 192 |  |
Operating Segments | Consumers Energy Company | Gas Utility |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 188 |  |  | 1,263 |  |
Financing income |  | 0 |  |  | 4 |  |
Alternative revenue programs |  | 1 |  |  | 5 |  |
Total operating revenue |  | 189 |  | 190 | 1,272 |  | 1,176
Operating Segments | Consumers Energy Company | Gas Utility | Residential |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 118 |  |  | 849 |  |
Operating Segments | Consumers Energy Company | Gas Utility | Commercial |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 30 |  |  | 250 |  |
Operating Segments | Consumers Energy Company | Gas Utility | Industrial |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 4 |  |  | 37 |  |
Operating Segments | Consumers Energy Company | Gas Utility | Other |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 36 |  |  | 127 |  |
Other reconciling items |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Financing income | [2] | 40 |  |  | 111 |  |
Total operating revenue |  | 40 | [2] | $ 32 | 111 | [2] | $ 97
Other reconciling items | Consumers Energy Company |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Total operating revenue |  | $ 0 |  |  | $ 0 |  |
[1] | Amounts represent the enterprises segment’s operating revenue from independent power production and CMS ERM’s sales of energy commodities in support of the independent power production portfolio.
[2] | Amount represents EnerBank’s operating revenue from unsecured consumer installment loans for financing home improvements.

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