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REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | [1] | $ 3,231 | $ 2,989
Operating Segments | Regulated Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 2,796 | 2,558
Total revenues |  | 2,826 | 2,589
Operating Segments | Regulated Distribution | Wholesale |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 47 | 90
Operating Segments | Regulated Distribution | Other Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 24 | 26
Operating Segments | Regulated Distribution | Product and Service, Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | 30 | 31
Operating Segments | Regulated Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 460 | 451
Total revenues |  | 461 | 453
Operating Segments | Regulated Transmission | Product and Service, Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | 1 | 2
Operating Segments | Residential | Regulated Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 1,702 | 1,542
Operating Segments | Commercial | Regulated Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 645 | 597
Operating Segments | Industrial | Regulated Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 353 | 283
Operating Segments | Other | Regulated Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 25 | 20
Operating Segments | ATSI | Regulated Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 226 | 217
Operating Segments | TrAIL | Regulated Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 66 | 63
Operating Segments | MAIT | Regulated Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 89 | 79
Operating Segments | JCP&L | Regulated Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 43 | 60
Operating Segments | MP, PE and WP | Regulated Transmission |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 36 | 32
Corporate/Other and Reconciling Adjustments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | (56) | (53)
Corporate/Other and Reconciling Adjustments | Wholesale |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | 2 | 6
Corporate/Other and Reconciling Adjustments | Product and Service, Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues |  | (13) | (14)
Corporate/Other and Reconciling Adjustments | Retail Generation and Distribution Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues from contracts with customers |  | $ (45) | $ (45)
[1] | Includes excise and gross receipts tax collections of $109 million and $103 million during the three months ended March 31, 2023 and 2022, respectively.

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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