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CAPITALIZATION - Schedule of Long Term Debt (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 25, 2022 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Nov. 30, 2022 | Jun. 30, 2022 | Apr. 30, 2022 | Mar. 31, 2022 | Feb. 28, 2022 | Jan. 31, 2022
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Losses on deferred cash flows | $ 7 |  |  |  |  |  |  |  |  |  |
Losses on deferred cash flows, net | 5 |  |  |  |  |  |  |  |  |  |
Debt issuance costs | 10 |  | $ 3 |  |  |  |  |  |  |  |
Debt issuance costs, after tax | 8 |  | 2 |  |  |  |  |  |  |  |
Repayments of debt |  |  | 3,005 | $ 532 | $ 1,114 |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Prepayments of debt | 1,100 |  |  |  |  |  |  |  |  |  |
Debt premium | 101 |  |  | 38 |  |  |  |  |  |  |
Make-whole premium, net | 80 |  |  | $ 30 |  |  |  |  |  |  |
Open market discount |  |  | 11 |  |  |  |  |  |  |  |
Open market discount, net |  |  | $ 9 |  |  |  |  |  |  |  |
4.25% Notes Due 2023 | Promissory Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  |  |  |  | 4.25%
Face amount of loan |  |  |  |  |  |  |  |  |  |  | $ 850
2.65%, Senior Secured Notes Maturing 2028 | Promissory Notes | TE |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  |  |  | 2.65% |
Face amount of loan |  |  |  |  |  |  |  |  |  | $ 25 |
2.77% Series A Senior Notes Due 2034 | Promissory Notes | CEI |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  |  | 2.77% |  |
Face amount of loan |  |  |  |  |  |  |  |  | $ 150 |  |
3.34% First Mortgage Bond Due April 2022 | Promissory Notes | WP |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  | 3.34% |  |  |
Face amount of loan |  |  |  |  |  |  |  | $ 100 |  |  |
2.85%, 500 Million Notes | Promissory Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 2.85% |  |  |  |
Face amount of loan |  |  |  |  |  |  | $ 500 |  |  |  |
7.375% Notes Due 2031 | Promissory Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  | 7.375% | 7.375% |  |  |  |
Face amount of loan |  | $ 128 |  |  |  |  | $ 715 |  |  |  |
7.375% Notes Due 2031 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt and other long-term obligations | 1,500 |  |  |  |  |  |  |  |  |  |
4.85% Notes Due 2047 | Promissory Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  | 4.85% |  |  |  |  | 4.85% |  |  |  |
Face amount of loan |  | $ 110 |  |  |  |  | $ 284 |  |  |  |
6.09% First Mortgage Bond Due June 2022 | Promissory Notes | Penn |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 6.09% |  |  |  |
Face amount of loan |  |  |  |  |  |  | $ 100 |  |  |  |
3.79%, 150 Million Notes Maturing 2032 | First Mortgage Bond | Penn |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  | 3.79% |  |  |  |  |
Face amount of loan |  |  |  |  |  | $ 150 |  |  |  |  |
5.50%, 300 Million Notes Maturing 2033 | Senior Notes | OE |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  | 5.50% |  |  |  |  |  |  |  |  |
Face amount of loan |  | $ 300 |  |  |  |  |  |  |  |  |
Series C 4.85% Senior Notes Due 2047 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt and other long-term obligations | $ 1,000 |  |  |  |  |  |  |  |  |  |
7.375% Notes Due 2031 and 5.35% Notes Due 2047 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | $ 249 |  |  |  |  |  |  |  |  |
5.29% First Mortgage Bond Due 2033 | First Mortgage Bond | WP |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  | 5.29% |  |  |  |  |
Face amount of loan |  |  |  |  |  | $ 250 |  |  |  |  |

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