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Revenue (Components Of Operating Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | $ 1,413 |  |  | $ 3,286 |  |
Leasing income |  | 37 |  |  | 76 |  |
Financing income |  | 40 |  |  | 79 |  |
Alternative revenue programs |  | 2 |  |  | 4 |  |
Total operating revenue |  | 1,492 |  | $ 1,449 | 3,445 |  | $ 3,278
Other |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 24 |  |  | 48 |  |
Consumers Energy Company |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 1,389 |  |  | 3,238 |  |
Financing income |  | 4 |  |  | 8 |  |
Alternative revenue programs |  | 2 |  |  | 4 |  |
Total operating revenue |  | 1,395 |  | 1,362 | 3,250 |  | 3,099
Consumers Energy Company | Residential |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 669 |  |  | 1,707 |  |
Consumers Energy Company | Commercial |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 444 |  |  | 967 |  |
Consumers Energy Company | Industrial |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 179 |  |  | 346 |  |
Consumers Energy Company | Other |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 97 |  |  | 218 |  |
Operating Segments | Electric Utility |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 1,087 |  |  | 2,163 |  |
Financing income |  | 2 |  |  | 4 |  |
Total operating revenue |  | 1,089 |  | 1,077 | 2,167 |  | 2,113
Operating Segments | Gas Utility |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 302 |  |  | 1,075 |  |
Financing income |  | 2 |  |  | 4 |  |
Alternative revenue programs |  | 2 |  |  | 4 |  |
Total operating revenue |  | 306 |  | 285 | 1,083 |  | 986
Operating Segments | Enterprises |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers | [1] | 24 |  |  | 48 |  |
Leasing income | [1] | 37 |  |  | 76 |  |
Total operating revenue |  | 61 | [1] | 55 | 124 | [1] | 114
Operating Segments | Enterprises | Other |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers | [1] | 24 |  |  | 48 |  |
Operating Segments | Consumers Energy Company | Electric Utility |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 1,087 |  |  | 2,163 |  |
Financing income |  | 2 |  |  | 4 |  |
Total operating revenue |  | 1,089 |  | 1,077 | 2,167 |  | 2,113
Operating Segments | Consumers Energy Company | Electric Utility | Residential |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 475 |  |  | 976 |  |
Operating Segments | Consumers Energy Company | Electric Utility | Commercial |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 386 |  |  | 747 |  |
Operating Segments | Consumers Energy Company | Electric Utility | Industrial |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 170 |  |  | 313 |  |
Operating Segments | Consumers Energy Company | Electric Utility | Other |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 56 |  |  | 127 |  |
Operating Segments | Consumers Energy Company | Gas Utility |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 302 |  |  | 1,075 |  |
Financing income |  | 2 |  |  | 4 |  |
Alternative revenue programs |  | 2 |  |  | 4 |  |
Total operating revenue |  | 306 |  | 285 | 1,083 |  | 986
Operating Segments | Consumers Energy Company | Gas Utility | Residential |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 194 |  |  | 731 |  |
Operating Segments | Consumers Energy Company | Gas Utility | Commercial |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 58 |  |  | 220 |  |
Operating Segments | Consumers Energy Company | Gas Utility | Industrial |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 9 |  |  | 33 |  |
Operating Segments | Consumers Energy Company | Gas Utility | Other |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Revenue recognized from contracts with customers |  | 41 |  |  | 91 |  |
Other reconciling items |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Financing income | [2] | 36 |  |  | 71 |  |
Total operating revenue |  | 36 | [2] | $ 32 | 71 | [2] | $ 65
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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