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Revenue (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) company MW | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) company MW | Jun. 30, 2020 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | $ 2,610 | $ 2,493 | $ 5,353 | $ 5,122
Total revenues | [1] | 2,622 | 2,522 | 5,348 | 5,231
Other Non-Customer Revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Late payment charges |  | 9 | 6 | 18 | 16
Distribution services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,278 | 1,219 | 2,591 | 2,454
Retail generation |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 818 | 811 | 1,741 | 1,700
Wholesale sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 77 | 52 | 150 | 124
Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 411 | 380 | 812 | 777
Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 26 | 31 | 59 | 67
ARP |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 0 | 15 | (27) | 83
Other non-customer revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 12 | 14 | 22 | 26
Derivative revenue | Other Non-Customer Revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Late payment charges |  | 2 | 6 | 2 | 6
Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | $ 2,135 | 2,067 | $ 4,409 | 4,227
Number of existing utility operating companies | company |  | 10 |  | 10 |
Megawatts of net demonstrated capacity of competitive segment | MW |  | 3,580 |  | 3,580 |
Utility customer payment period |  |  |  | 30 days |
Regulated Distribution | Residential |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | $ 1,287 | 1,280 | $ 2,744 | 2,599
Regulated Distribution | Commercial |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 562 | 507 | 1,103 | 1,051
Regulated Distribution | Industrial |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 268 | 259 | 526 | 536
Regulated Distribution | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 18 | 21 | 36 | 41
Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 411 | 380 | 812 | 777
Regulated Transmission | ATSI |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 193 | 192 | 398 | 394
Regulated Transmission | TrAIL |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 57 | 57 | 117 | 121
Regulated Transmission | MAIT |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 80 | 58 | 147 | 117
Regulated Transmission | JCP&L |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 46 | 39 | 85 | 77
Regulated Transmission | MP, PE and WP |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 35 | 34 | 65 | 68
Operating Segments | Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 2,235 | 2,148 | 4,611 | 4,415
Total revenues |  | 2,258 | 2,188 | 4,628 | 4,546
Operating Segments | Regulated Distribution | Distribution services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,304 | 1,241 | 2,643 | 2,497
Operating Segments | Regulated Distribution | Retail generation |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 831 | 826 | 1,766 | 1,730
Operating Segments | Regulated Distribution | Wholesale sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 74 | 50 | 143 | 121
Operating Segments | Regulated Distribution | Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 0 | 0 | 0 | 0
Operating Segments | Regulated Distribution | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 26 | 31 | 59 | 67
Operating Segments | Regulated Distribution | ARP |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 0 | 15 | (27) | 83
Operating Segments | Regulated Distribution | Other non-customer revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 23 | 25 | 44 | 48
Operating Segments | Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 411 | 380 | 812 | 777
Total revenues |  | 419 | 384 | 824 | 785
Operating Segments | Regulated Transmission | Distribution services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 0 | 0 | 0 | 0
Operating Segments | Regulated Transmission | Retail generation |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 0 | 0 | 0 | 0
Operating Segments | Regulated Transmission | Wholesale sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 0 | 0 | 0 | 0
Operating Segments | Regulated Transmission | Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 411 | 380 | 812 | 777
Operating Segments | Regulated Transmission | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 0 | 0 | 0 | 0
Operating Segments | Regulated Transmission | ARP |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 0 | 0 | 0 | 0
Operating Segments | Regulated Transmission | Other non-customer revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 8 | 4 | 12 | 8
Corporate/Other and Reconciling Adjustments |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | (36) | (35) | (70) | (70)
Total revenues |  | (55) | (50) | (104) | (100)
Corporate/Other and Reconciling Adjustments | Distribution services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | (26) | (22) | (52) | (43)
Corporate/Other and Reconciling Adjustments | Retail generation |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | (13) | (15) | (25) | (30)
Corporate/Other and Reconciling Adjustments | Wholesale sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 3 | 2 | 7 | 3
Corporate/Other and Reconciling Adjustments | Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 0 | 0 | 0 | 0
Corporate/Other and Reconciling Adjustments | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 0 | 0 | 0 | 0
Corporate/Other and Reconciling Adjustments | ARP |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 0 | 0 | 0 | 0
Corporate/Other and Reconciling Adjustments | Other non-customer revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | $ (19) | $ (15) | $ (34) | $ (30)
[1] | Includes excise and gross receipts tax collections of $85 million and $84 million during the three months ended June 30, 2021 and 2020, respectively, and $180 million and $176 million during the six months ended June 30, 2021 and 2020, respectively.

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