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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Net Periodic Benefit Cost - Continuing Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net periodic benefit cost          
Settlement charges $ (43) $ (755) $ (2) $ (46) $ (755)
Pension benefits          
Net periodic benefit cost          
Service cost     87 83 74
Interest cost     72 95 172
Expected return on plan assets     (143) (163) (264)
Amortization of net losses and other deferred amounts     91 77 58
Other     (4) 0 0
Net periodic benefit cost     105 138 795
OPEB          
Net periodic benefit cost          
Service cost     1 1 1
Interest cost     4 6 8
Amortization of net losses and prior service credit     (9) (18) (27)
Net periodic benefit cost     $ (4) $ (11) $ (18)