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ORGANIZATION AND BASIS OF PRESENTATION - Narrative (Details) customer in Millions, $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended |  |
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Jul. 17, 2024 USD ($) | Mar. 25, 2024 USD ($) promissoryNote | May 31, 2022 USD ($) | Sep. 30, 2024 USD ($) mi² transmissionCenter | Mar. 31, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) mi² customer transmissionCenter | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Feb. 02, 2023 USD ($)
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  | 6.0 |  |  |
Number of regional transmission centers | transmissionCenter |  |  |  | 2 |  |  | 2 |  |  |
FET Equity Interest Sale (Note 1) |  |  |  |  | $ 2,673 |  |  |  |  |
Capitalized cost of equity |  |  |  | $ 16 |  | $ 12 | $ 42 | $ 31 |  |
Capitalized interest |  |  |  | 19 |  | 14 | 52 | 38 |  |
Equity method investment earnings (Note 1) |  |  |  | 21 |  | 43 | 64 | 134 |  |
Impairment of long-lived assets to be disposed of |  |  |  | 62 |  |  |  |  |  |
Revision of Prior Period, Adjustment |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred tax assets, valuation allowance |  |  |  | 21 |  |  | 21 |  |  |
Operating Segments |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment earnings (Note 1) |  |  |  | 0 |  | 0 | 0 | 0 |  |
NCI |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
FET Equity Interest Sale (Note 1) |  |  |  |  | 731 |  |  |  |  |
OPIC |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
FET Equity Interest Sale (Note 1) |  |  |  |  | $ 1,942 |  |  |  |  |
Other Sundry Investments |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  | 109 |  |  | 109 |  | $ 104 |
Global Holding |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  | 69 |  |  | 69 |  | 66 |
FE | FET |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  |  | 50.10%
Variable Interest Entity, Not Primary Beneficiary | Path Wv |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  | $ 17 |  |  | $ 17 |  | $ 17 |
Variable interest entities percentage of high voltage transmission line project owned By variable interest entity one in joint venture party one |  |  |  | 100.00% |  |  | 100.00% |  |  |
Variable interest entities percentage of high voltage transmission line project owned by variable interest entity one in joint venture party two |  |  |  | 50.00% |  |  | 50.00% |  |  |
FET |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  |  |  | 49.90% |  |  | 49.90% |  |  |
North American Transmission Company II LLC | FET |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of ownership interest by parent |  |  |  |  |  |  |  |  |  | 30.00%
Number of promissory notes | promissoryNote |  | 2 |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  |  |  |  |  |  |  |  |  | 49.90%
Regulated Transmission |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Service area | mi² |  |  |  | 24,000 |  |  | 24,000 |  |  |
Regulated Transmission | Operating Segments |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment earnings (Note 1) |  |  |  | $ 0 |  | 0 | $ 0 | 0 |  |
Distribution Segment |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  | 4.2 |  |  |
Impairment of long-lived assets to be disposed of |  |  |  | 31 |  |  |  |  |  |
Distribution Segment | Operating Segments |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment earnings (Note 1) |  |  |  | 0 |  | 0 | $ 0 | 0 |  |
Integrated |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  | 2.0 |  |  |
Impairment of long-lived assets to be disposed of |  |  |  | 17 |  |  |  |  |  |
Integrated | Operating Segments |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment earnings (Note 1) |  |  |  | 0 |  | 0 | $ 0 | 0 |  |
Stand-Alone Transmission Segment |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets to be disposed of |  |  |  | 11 |  |  |  |  |  |
Corporate Non Segment |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets to be disposed of |  |  |  | $ 3 |  |  |  |  |  |
FE PA |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  | 4.5 |  |  |
FET |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Net of transaction costs |  |  | $ 30 |  |  |  |  |  |  |
Net of taxes |  |  | $ 797 |  |  |  |  |  |  |
FET | North American Transmission Company II LLC |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of ownership interest by parent |  | 49.90% | 19.90% |  |  |  |  |  |  |
Consideration |  |  |  |  |  |  |  |  |  | $ 3,500
Brookfield | North American Transmission Company II LLC |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Interest income, operating |  |  |  |  |  |  | $ 24 |  |  |
Brookfield | North American Transmission Company II LLC | FET |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Business combination, consideration transferred, liabilities incurred | $ 1,200 | $ 1,200 |  |  |  |  |  |  |  |
Cash paid in acquisition |  |  |  |  |  |  | $ 2,300 |  |  |
Brookfield | North American Transmission Company II LLC | FET | Promissory Note, $750 Million at 5.575% Due September 2025 |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  | $ 750 |  |  |  |  |  |  |  |
Issuance interest rate |  | 5.75% |  |  |  |  |  |  |  |
Brookfield | North American Transmission Company II LLC | FET | Promissory Note, $450 Million at 7.75% Due September 2025 |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  | $ 450 |  |  |  |  |  |  |  |
Issuance interest rate |  | 7.75% |  |  |  |  |  |  |  |
FEV | Global Holding |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  |  | 33.30% |  |  | 33.30% |  |  |
FEV | Variable Interest Entity, Not Primary Beneficiary | Global Holding |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from dividends received |  |  |  |  |  |  | $ 60 | 135 |  |
FEV | Corporate and Other | Global Holding | Other Nonoperating Income (Expense) |  |  |  |  |  |  |  |  |  |
Regulatory Asset [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method investment earnings (Note 1) |  |  |  | $ 21 |  | $ 43 | $ 63 | $ 132 |  |

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