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Revenue (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) company MW | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) company MW | Sep. 30, 2017 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | $ 2,986 |  | $ 8,313 |
ARP |  | 66 |  | 190 |
Other non-customer revenue |  | 12 |  | 48 |
Total revenues(1) | [1] | 3,064 | $ 2,910 | 8,551 | $ 8,247
Distribution services | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,418 |  | 3,868 |
Retail generation | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,045 |  | 2,939 |
Wholesale sales | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 139 |  | 393 |
Transmission | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 341 |  | 996 |
Other | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 43 |  | 117 |
Derivative Revenue | Other Non-Customer Revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues(1) |  | 4 |  | 18 |
Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues(1) |  | 2,499 |  | 6,930 |
Reduction in revenue |  | $ 27 |  | $ 109 |
Number of existing utility operating companies | company |  | 10 |  | 10 |
Megawatts of net demonstrated capacity of competitive segment | MW |  | 3,790 |  | 3,790 |
Utility customer payment period |  |  |  | 30 days |
Regulated Distribution | Residential |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues(1) |  | $ 1,572 |  | $ 4,290 |
Regulated Distribution | Commercial |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues(1) |  | 628 |  | 1,778 |
Regulated Distribution | Industrial |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues(1) |  | 276 |  | 792 |
Regulated Distribution | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues(1) |  | 23 |  | 70 |
Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues(1) |  | 341 |  | 996 |
Reduction in revenue |  |  |  | 4 |
Recovery of revenue |  | 2 |  |  |
Regulated Transmission | JCP&L | FERC |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Annual revenue requirement |  |  |  | 155 |
Regulated Transmission | ATSI |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues(1) |  | 167 |  | 492 |
Regulated Transmission | TrAIL |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues(1) |  | 60 |  | 183 |
Regulated Transmission | MAIT |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues(1) |  | 43 |  | 106 |
Regulated Transmission | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues(1) |  | 71 |  | 215 |
Operating Segments | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Reduction in revenue |  | 29 |  | 113 |
Operating Segments | Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 2,675 |  | 7,420 |
ARP |  | 66 |  | 190 |
Other non-customer revenue |  | 25 |  | 84 |
Total revenues(1) |  | 2,766 | 2,609 | 7,694 | 7,380
Operating Segments | Regulated Distribution | Distribution services | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,440 |  | 3,949 |
Operating Segments | Regulated Distribution | Retail generation | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,059 |  | 2,981 |
Operating Segments | Regulated Distribution | Wholesale sales | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 133 |  | 377 |
Operating Segments | Regulated Distribution | Transmission | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 0 |  | 0 |
Operating Segments | Regulated Distribution | Other | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 43 |  | 113 |
Operating Segments | Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 341 |  | 996 |
ARP |  | 0 |  | 0 |
Other non-customer revenue |  | 5 |  | 14 |
Total revenues(1) |  | 346 | $ 341 | 1,010 | $ 981
Operating Segments | Regulated Transmission | Distribution services | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 0 |  | 0 |
Operating Segments | Regulated Transmission | Retail generation | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 0 |  | 0 |
Operating Segments | Regulated Transmission | Wholesale sales | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 0 |  | 0 |
Operating Segments | Regulated Transmission | Transmission | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 341 |  | 996 |
Operating Segments | Regulated Transmission | Other | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 0 |  | 0 |
Corporate/Other and Reconciling Adjustments |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | (30) |  | (103) |
ARP |  | 0 |  | 0 |
Other non-customer revenue |  | (18) |  | (50) |
Total revenues(1) |  | (48) |  | (153) |
Corporate/Other and Reconciling Adjustments | Distribution services | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | (22) |  | (81) |
Corporate/Other and Reconciling Adjustments | Retail generation | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | (14) |  | (42) |
Corporate/Other and Reconciling Adjustments | Wholesale sales | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 6 |  | 16 |
Corporate/Other and Reconciling Adjustments | Transmission | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 0 |  | 0 |
Corporate/Other and Reconciling Adjustments | Other | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | $ 0 |  | $ 4 |
[1] | Includes excise tax collections of $104 million and $102 million in the three months ended September 30, 2018 and 2017, respectively, and $293 million in the nine months ended September 30, 2018 and 2017.

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