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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in AOCI (loss) related to shareholders' equity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 1,830 | $ 618 |
Ending balance | 1,657 | 1,830 | $ 618
Foreign Currency Translation |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | (1) | 1 | 3
Other comprehensive income (loss) before reclassifications, net of tax | 1 | (2) | (2)
Ending balance | 0 | (1) | 1
Derivative Instruments |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | (16) | 68 | (1)
Other comprehensive income (loss) before reclassifications | (345) | 146 | 151
Income tax | 81 | (33) | (34)
Other comprehensive income (loss) before reclassifications, net of tax | (264) | 113 | 117
Losses (gains) reclassified from AOCI to net income | 144 | (256) | (61)
Income tax expense (benefit) | (34) | 59 | 13
Net losses (gains) reclassified from AOCI to net income | 110 | (197) | (48)
Ending balance | (170) | (16) | 68
Pension and OPEB |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | 1,847 | 549 | (135)
Other comprehensive income (loss) before reclassifications | 115 | 1,759 | 878
Income tax | (39) | (434) | (203)
Other comprehensive income (loss) before reclassifications, net of tax | 76 | 1,325 | 675
Losses (gains) reclassified from AOCI to net income | (145) | (36) | 12
Income tax expense (benefit) | 49 | 9 | (3)
Net losses (gains) reclassified from AOCI to net income | (96) | (27) | 9
Ending balance | $ 1,827 | $ 1,847 | $ 549

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