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ACCUMULATED OTHER COMPREHENSIVE INCOME - Changes in AOCI (loss) related to shareholders' equity (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | $ 1,657 |
Ending balance | 1,648 | $ 1,651
Foreign Currency Translation |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | 0 | (1)
Other comprehensive loss before reclassifications, net of tax | (1) | 0
Ending balance | (1) | (1)
Derivative Instruments |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | (170) | (16)
Other comprehensive loss before reclassifications | (33) | (177)
Income tax | 8 | 44
Other comprehensive loss before reclassifications, net of tax | (25) | (133)
(Gains) losses reclassified from AOCI to net income | 59 | (25)
Income tax expense (benefit) | (14) | 6
Net losses (gains) reclassified from AOCI to net income | 45 | (19)
Ending balance | (150) | (168)
Pension and OPEB |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | 1,827 | 1,847
(Gains) losses reclassified from AOCI to net income | (38) | (35)
Income tax expense (benefit) | 10 | 8
Net losses (gains) reclassified from AOCI to net income | (28) | (27)
Ending balance | $ 1,799 | $ 1,820

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