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Revenue (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) company MW | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) company MW | Jun. 30, 2017 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | $ 2,629 |  | $ 5,521 |
ARP |  | 60 |  | 124 |
Other non-customer revenue |  | 15 |  | 35 |
Total revenues(1) | [1] | 2,704 | $ 2,624 | 5,680 | $ 5,479
Regulated Transmission |  | 341 | 327 | 664 | 640
Distribution services | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,185 |  | 2,454 |
Retail generation | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 868 |  | 1,894 |
Wholesale sales | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 205 |  | 448 |
Transmission | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 336 |  | 655 |
Other | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 35 |  | 70 |
Derivative Revenue | Other Non-Customer Revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues(1) |  | 4 |  | 14 |
Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues(1) |  | 2,110 |  | 4,431 |
Reduction in revenue |  | $ 10 |  | $ 82 |
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) |  | $ 1,255 |  | $ 2,718 |
Regulated Distribution | Commercial |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues(1) |  | 570 |  | 1,150 |
Regulated Distribution | Industrial |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues(1) |  | 262 |  | 516 |
Regulated Distribution | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues(1) |  | 23 |  | 47 |
Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Reduction in revenue |  |  |  | 2 |
Recovery of revenue |  | 2 |  |  |
Regulated Transmission |  | 336 |  | 655 |
Regulated Transmission | JCP&L | FERC |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Annual revenue requirement |  |  |  | 155 |
Regulated Transmission | ATSI |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Regulated Transmission |  | 167 |  | 325 |
Regulated Transmission | TrAIL |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Regulated Transmission |  | 63 |  | 123 |
Regulated Transmission | MAIT |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Regulated Transmission |  | 34 |  | 64 |
Regulated Transmission | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Regulated Transmission |  | 72 |  | 143 |
Operating Segments | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Reduction in revenue |  | 8 |  | 84 |
Operating Segments | Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 2,266 |  | 4,745 |
ARP |  | 60 |  | 124 |
Other non-customer revenue |  | 26 |  | 59 |
Total revenues(1) |  | 2,352 | 2,271 | 4,928 | 4,771
Operating Segments | Regulated Distribution | Distribution services | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,228 |  | 2,509 |
Operating Segments | Regulated Distribution | Retail generation | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 882 |  | 1,922 |
Operating Segments | Regulated Distribution | Wholesale sales | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 121 |  | 244 |
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 |  | 35 |  | 70 |
Operating Segments | Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 336 |  | 655 |
ARP |  | 0 |  | 0 |
Other non-customer revenue |  | 5 |  | 9 |
Total revenues(1) |  | 341 | $ 327 | 664 | $ 640
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 |  | 336 |  | 655 |
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 |  | 27 |  | 121 |
ARP |  | 0 |  | 0 |
Other non-customer revenue |  | (16) |  | (33) |
Total revenues(1) |  | 11 |  | 88 |
Corporate/Other and Reconciling Adjustments | Distribution services | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | (43) |  | (55) |
Corporate/Other and Reconciling Adjustments | Retail generation | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | (14) |  | (28) |
Corporate/Other and Reconciling Adjustments | Wholesale sales | Customer |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 84 |  | 204 |
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 |  |  |
[1] | Includes excise tax collections of $87 million and $91 million in the three months ended June 30, 2018 and 2017, respectively, and $189 million and $191 million in the six months ended June 30, 2018 and 2017, respectively.

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