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Revenue (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) company MW | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) company MW | Sep. 30, 2020 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | $ 3,113 | $ 2,983 | $ 8,466 | $ 8,105
Total revenues | [1] | 3,124 | 3,022 | 8,472 | 8,253
Other Non-Customer Revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Late payment charges |  | 9 | 6 | 27 | 22
Distribution services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,509 | 1,481 | 4,100 | 3,935
Retail generation |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,041 | 989 | 2,782 | 2,689
Wholesale sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 122 | 70 | 272 | 194
Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 411 | 408 | 1,223 | 1,185
Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 30 | 35 | 89 | 102
ARP |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 0 | 25 | (27) | 108
Other non-customer revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 11 | 14 | 33 | 40
Derivative revenue | Other Non-Customer Revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Late payment charges |  | 3 | 8 | 5 | 14
Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | $ 2,588 | 2,508 | $ 6,997 | 6,735
Refund of revenue |  |  | 1 |  | 2
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 from contracts with customers |  | $ 1,666 | 1,621 | $ 4,410 | 4,220
Regulated Distribution | Commercial |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 619 | 589 | 1,722 | 1,640
Regulated Distribution | Industrial |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 284 | 278 | 810 | 814
Regulated Distribution | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 19 | 20 | 55 | 61
Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 411 | 408 | 1,223 | 1,185
Refund of revenue |  |  | 3 |  | 6
Regulated Transmission | ATSI |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 206 | 202 | 604 | 598
Regulated Transmission | TrAIL |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 59 | 61 | 176 | 182
Regulated Transmission | MAIT |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 75 | 68 | 222 | 183
Regulated Transmission | JCP&L |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 41 | 43 | 126 | 122
Regulated Transmission | MP, PE and WP |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 30 | 34 | 95 | 100
Operating Segments | Regulated Distribution |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 2,735 | 2,610 | 7,346 | 7,025
Total revenues |  | 2,759 | 2,661 | 7,387 | 7,207
Operating Segments | Regulated Distribution | Distribution services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,534 | 1,503 | 4,177 | 4,000
Operating Segments | Regulated Distribution | Retail generation |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 1,054 | 1,005 | 2,820 | 2,735
Operating Segments | Regulated Distribution | Wholesale sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 117 | 67 | 260 | 188
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 |  | 30 | 35 | 89 | 102
Operating Segments | Regulated Distribution | ARP |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 0 | 25 | (27) | 108
Operating Segments | Regulated Distribution | Other non-customer revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues |  | 24 | 26 | 68 | 74
Operating Segments | Regulated Transmission |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 411 | 408 | 1,223 | 1,185
Total revenues |  | 415 | 413 | 1,233 | 1,198
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 | 408 | 1,223 | 1,185
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 |  | 4 | 5 | 10 | 13
Corporate/Other and Reconciling Adjustments |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | (33) | (35) | (103) | (105)
Total revenues |  | (50) | (52) | (148) | (152)
Corporate/Other and Reconciling Adjustments | Distribution services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | (25) | (22) | (77) | (65)
Corporate/Other and Reconciling Adjustments | Retail generation |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | (13) | (16) | (38) | (46)
Corporate/Other and Reconciling Adjustments | Wholesale sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenues from contracts with customers |  | 5 | 3 | 12 | 6
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 |  | $ (17) | $ (17) | $ (45) | $ (47)
[1] | Includes excise and gross receipts tax collections of $103 million and $100 million during the three months ended September 30, 2021 and 2020, respectively, and $283 million and $276 million during the nine months ended September 30, 2021 and 2020, respectively.

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