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Revenue (Components Of Operating Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | $ 1,957 | $ 1,873
Leasing income | 48 |
Leasing income |  | 39
Financing income | 54 | 39
Alternative revenue programs | 0 | 2
Total operating revenue | 2,059 | 1,953
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 19 | 24
Consumers Energy Company |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 1,938 | 1,849
Financing income | 5 | 4
Alternative revenue programs | 0 | 2
Total operating revenue | 1,943 | 1,855
Consumers Energy Company | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 1,112 | 1,038
Consumers Energy Company | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 525 | 523
Consumers Energy Company | Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 187 | 167
Consumers Energy Company | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 114 | 121
Operating Segments | Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 1,100 | 1,076
Financing income | 3 | 2
Total operating revenue | 1,103 | 1,078
Operating Segments | Gas Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 838 | 773
Financing income | 2 | 2
Alternative revenue programs | 0 | 2
Total operating revenue | 840 | 777
Operating Segments | Enterprises |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 19 | 24
Leasing income | 48 |
Leasing income |  | 39
Total operating revenue | 67 | 63
Operating Segments | Enterprises | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 19 | 24
Operating Segments | Consumers Energy Company | Electric Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 1,100 | 1,076
Financing income | 3 | 2
Total operating revenue | 1,103 | 1,078
Operating Segments | Consumers Energy Company | Electric Utility | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 523 | 501
Operating Segments | Consumers Energy Company | Electric Utility | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 351 | 361
Operating Segments | Consumers Energy Company | Electric Utility | Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 162 | 143
Operating Segments | Consumers Energy Company | Electric Utility | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 64 | 71
Operating Segments | Consumers Energy Company | Gas Utility |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 838 | 773
Financing income | 2 | 2
Alternative revenue programs | 0 | 2
Total operating revenue | 840 | 777
Operating Segments | Consumers Energy Company | Gas Utility | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 589 | 537
Operating Segments | Consumers Energy Company | Gas Utility | Commercial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 174 | 162
Operating Segments | Consumers Energy Company | Gas Utility | Industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 25 | 24
Operating Segments | Consumers Energy Company | Gas Utility | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognized from contracts with customers | 50 | 50
Operating Segments | Consumers Energy Company | Enterprises |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenue | 0 | 0
Other reconciling items |  |
Disaggregation of Revenue [Line Items] |  |
Financing income | 49 | 35
Total operating revenue | 49 | 35
Other reconciling items | Consumers Energy Company |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenue | $ 0 | $ 0

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