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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Summary of Pre-Tax losses Included in AOCI (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Pension benefits |  |
Summary of the pre-tax losses included in AOCI |  |
Actuarial loss (gain) | $ 509 | $ 509
Prior service credit and transition obligation | 8 | 8
Total pre-tax loss (gain) recognized in AOCI | 517 | 517
OPEB |  |
Summary of the pre-tax losses included in AOCI |  |
Actuarial loss (gain) | (69) | (37)
Prior service credit and transition obligation | (27) | (36)
Total pre-tax loss (gain) recognized in AOCI | $ (96) | $ (73)

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