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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Summary of Pre-Tax losses Included in AOCI (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Pension benefits    
Summary of the pre-tax losses included in AOCI    
Actuarial loss (gain) $ 509 $ 811
Prior service credit and transition obligation 8 (9)
Total pre-tax loss (gain) recognized in AOCI 517 802
OPEB    
Summary of the pre-tax losses included in AOCI    
Actuarial loss (gain) (37) (23)
Prior service credit and transition obligation (36) (45)
Total pre-tax loss (gain) recognized in AOCI $ (73) $ (68)