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REVENUE (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) company MW | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | $ 10,701 | $ 10,805 | $ 10,944
ARP |  | 43 | 181 | 254
Other non-customer revenue |  | 46 | 49 | 63
Total revenues | [1] | $ 10,790 | 11,035 | 11,261
Utility customer payment period |  | 30 days |  |
Other Non-Customer Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Late payment charges |  | $ 31 | 37 | 39
Distribution services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 5,171 | 5,050 | 5,055
Total revenues |  | 8,688 | 8,720 | 8,937
Retail generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 3,517 | 3,670 | 3,882
Wholesale sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 260 | 423 | 524
Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 1,613 | 1,510 | 1,335
Total revenues |  | 1,613 | 1,510 | 1,335
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 140 | 152 | 148
Total revenues |  | 489 | 805 | 989
Derivative Revenue | Other Non-Customer Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | $ 14 | 8 | 18
Utilities and FET |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Number of existing utility operating companies | company |  | 10 |  |
Megawatts of net demonstrated capacity of competitive segment (in MW's) | MW |  | 3,790 |  |
Utilities and FET | Yard's Creek Energy, LLC Hydro Generation Facility |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Megawatts of net demonstrated capacity of competitive segment (in MW's) | MW |  | 210 |  |
Utilities and FET | Retail generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | $ 8,836 | 8,860 | 9,095
Utilities and FET | Retail generation | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 5,539 | 5,412 | 5,598
Utilities and FET | Retail generation | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 2,140 | 2,252 | 2,350
Utilities and FET | Retail generation | Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 1,076 | 1,106 | 1,056
Utilities and FET | Retail generation | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 81 | 90 | 91
Regulated Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 1,613 | 1,510 | 1,335
Regulated Transmission | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 134 | 130 | 125
Regulated Transmission | ATSI |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 804 | 754 | 664
Regulated Transmission | TrAIL |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 247 | 242 | 237
Regulated Transmission | MAIT |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 250 | 224 | 150
Regulated Transmission | JCP&L |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  | 178 | 160 | 159
Operating Segments | Utilities and FET |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 9,227 | 9,421 | 9,741
ARP |  | 43 | 181 | 254
Other non-customer revenue |  | 93 | 96 | 108
Total revenues |  | 9,363 | 9,698 | 10,103
Reduction in revenue |  | 2 | 16 | 131
Operating Segments | Utilities and FET | Distribution services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 5,259 | 5,133 | 5,159
Operating Segments | Utilities and FET | Retail generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 3,577 | 3,727 | 3,936
Operating Segments | Utilities and FET | Wholesale sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 251 | 411 | 502
Operating Segments | Utilities and FET | Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 0 | 0 | 0
Operating Segments | Utilities and FET | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 140 | 150 | 144
Operating Segments | Regulated Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 1,613 | 1,510 | 1,335
ARP |  | 0 | 0 | 0
Other non-customer revenue |  | 17 | 16 | 18
Total revenues |  | 1,630 | 1,526 | 1,353
Reduction in revenue |  | 7 | 19 | 16
Operating Segments | Regulated Transmission | Distribution services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 0 | 0 | 0
Operating Segments | Regulated Transmission | Retail generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 0 | 0 | 0
Operating Segments | Regulated Transmission | Wholesale sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 0 | 0 | 0
Operating Segments | Regulated Transmission | Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 1,613 | 1,510 | 1,335
Operating Segments | Regulated Transmission | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 0 | 0 | 0
Corporate/Other and Reconciling Adjustments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | (139) | (126) | (132)
ARP |  | 0 | 0 | 0
Other non-customer revenue |  | (64) | (63) | (63)
Total revenues |  | (203) | (189) | (195)
Corporate/Other and Reconciling Adjustments | Distribution services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | (88) | (83) | (104)
Corporate/Other and Reconciling Adjustments | Retail generation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | (60) | (57) | (54)
Corporate/Other and Reconciling Adjustments | Wholesale sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 9 | 12 | 22
Corporate/Other and Reconciling Adjustments | Transmission |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | 0 | 0 | 0
Corporate/Other and Reconciling Adjustments | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers |  | $ 0 | $ 2 | $ 4
[1] | Includes excise and gross receipts tax collections of $362 million, $373 million and $386 million in 2020, 2019 and 2018, respectively.

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