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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 1,657 | $ 1,830 |
Ending balance | 1,537 | 1,657 | $ 1,830
Foreign Currency Translation |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | 0 | (1) | 1
Other comprehensive income (loss) before reclassifications, net of tax | (70) | 1 | (2)
Ending balance | (70) | 0 | (1)
Derivative Instruments |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | (170) | (16) | 68
Other comprehensive income (loss) before reclassifications | (41) | (345) | 146
Income tax | 10 | 81 | (33)
Other comprehensive income (loss) before reclassifications, net of tax | (31) | (264) | 113
Losses (gains) reclassified from AOCI to net income | 195 | 144 | (256)
Income tax expense (benefit) | (47) | (34) | 59
Net losses (gains) reclassified from AOCI to net income | 148 | 110 | (197)
Ending balance | (53) | (170) | (16)
Pension and OPEB |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | 1,827 | 1,847 | 549
Other comprehensive income (loss) before reclassifications | (68) | 115 | 1,759
Income tax | 17 | (39) | (434)
Other comprehensive income (loss) before reclassifications, net of tax | (51) | 76 | 1,325
Losses (gains) reclassified from AOCI to net income | (154) | (145) | (36)
Income tax expense (benefit) | 38 | 49 | 9
Net losses (gains) reclassified from AOCI to net income | (116) | (96) | (27)
Ending balance | $ 1,660 | $ 1,827 | $ 1,847

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