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Revenue (Components Of Operating Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | $ 1,873 |
Leasing income |  | 39 |
Financing income |  | 39 |
Total operating revenue |  | 1,953 | $ 1,829
Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | 24 |
Electric Utility [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | 1,076 |
Financing income |  | 2 |
Total operating revenue |  | 1,078 |
Gas Utility [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | 773 |
Financing income |  | 2 |
Total operating revenue |  | 777 |
Enterprises [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | [1] | 24 |
Leasing income | [1] | 39 |
Total operating revenue | [1] | 63 |
Enterprises [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers | [1] | 24 |
Other reconciling items [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Financing income | [2] | 35 |
Total operating revenue | [2] | 35 |
Consumers Energy Company [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | 1,849 |
Financing income |  | 4 |
Alternative revenue programs |  | 2 |
Total operating revenue |  | 1,855 | $ 1,737
Consumers Energy Company [Member] | Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | 1,038 |
Consumers Energy Company [Member] | Commercial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | 523 |
Consumers Energy Company [Member] | Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | 167 |
Consumers Energy Company [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | 121 |
Consumers Energy Company [Member] | Electric Utility [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | 1,076 |
Financing income |  | 2 |
Total operating revenue |  | 1,078 |
Consumers Energy Company [Member] | Electric Utility [Member] | Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | 501 |
Consumers Energy Company [Member] | Electric Utility [Member] | Commercial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | 361 |
Consumers Energy Company [Member] | Electric Utility [Member] | Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | 143 |
Consumers Energy Company [Member] | Electric Utility [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | 71 |
Consumers Energy Company [Member] | Gas Utility [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | 773 |
Financing income |  | 2 |
Alternative revenue programs |  | 2 |
Total operating revenue |  | 777 |
Consumers Energy Company [Member] | Gas Utility [Member] | Residential [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | 537 |
Consumers Energy Company [Member] | Gas Utility [Member] | Commercial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | 162 |
Consumers Energy Company [Member] | Gas Utility [Member] | Industrial [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | 24 |
Consumers Energy Company [Member] | Gas Utility [Member] | Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized from contracts with customers |  | $ 50 |
[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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