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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Summary of Pre-Tax losses Included in AOCI (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Pension benefits |  |
Summary of the pre-tax losses included in AOCI |  |
Actuarial loss (gain) | $ 642 | $ 615
Prior service credit and transition obligation | 11 | 11
Total pre-tax loss (gain) recognized in AOCI | 653 | 626
OPEB |  |
Summary of the pre-tax losses included in AOCI |  |
Actuarial loss (gain) | (42) | (50)
Prior service credit and transition obligation | (10) | (16)
Total pre-tax loss (gain) recognized in AOCI | $ (52) | $ (66)

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