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FAIR VALUE MEASUREMENTS - Schedule of Long Term Debt Redemption and Issuance (Details) - USD ($) $ in Millions |  | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
May 04, 2023 | May 31, 2023 | Apr. 30, 2023 | Mar. 31, 2023 | Feb. 28, 2023 | Jan. 31, 2023
Debt Instrument [Line Items] |  |  |  |  |  |
Losses on deferred cash flows |  | $ 2 |  |  |  |
Losses on deferred cash flows, net |  | 1 |  |  |  |
4.00%, 1,300 Million Notes Maturity 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from issuance of debt | $ 1,480 |  |  |  |  |
Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Early repayment of debt |  | 194 |  |  |  |
Make-whole premium |  | 34 |  |  |  |
Make-whole premium, net |  | 27 |  |  |  |
Senior Notes | 7.375% Secured Senior Notes Maturing 2031 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt and other long-term obligations |  | $ 228 |  |  |  |
ME | Promissory Notes | 3.50% Series B Senior Notes Due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance interest rate |  |  |  | 3.50% |  |
Face amount of debt |  |  |  | $ 300 |  |
ME | Promissory Notes | 3.50% Series B Senior Notes Due 2023 | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance interest rate |  |  |  | 3.50% |  |
Face amount of debt |  |  |  | $ 300 |  |
ME | Promissory Notes | 5.20%, 425 Million Notes Maturing 2028 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance interest rate |  |  |  | 5.20% |  |
Face amount of debt |  |  |  | $ 425 |  |
FE | Promissory Notes | 7.375% Secured Senior Notes Maturing 2031 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance interest rate |  | 7.375% |  |  |  |
Face amount of debt |  | $ 194 |  |  |  |
FE | Promissory Notes | 4.00%, 1,300 Million Notes Maturity 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance interest rate | 4.00% |  |  |  |  |
Face amount of debt | $ 1,500 |  |  |  |  |
WP | First Mortgage Bond | 5.29%, 50 Million Notes Maturing 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance interest rate |  |  |  |  |  | 5.29%
Face amount of debt |  |  |  |  |  | $ 50
MAIT | Promissory Notes | 5.39%, 175 Million Notes Maturing 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance interest rate |  |  |  |  | 5.39% |
Face amount of debt |  |  |  |  | $ 175 |
PN | Promissory Notes | 5.15%, 300 Million Notes Maturing 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance interest rate |  |  |  | 5.15% |  |
Face amount of debt |  |  |  | $ 300 |  |
ATSI | Promissory Notes | 5.13%, 150 Million Notes Maturity 2033 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance interest rate |  |  | 5.13% |  |  |
Face amount of debt |  |  | $ 150 |  |  |

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