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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Net Periodic Benefit Cost - Continuing Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net periodic benefit cost      
Defined Benefit Plan Net Periodic Benefit Cost Credit Settlement Gain Loss Statement Of Income Or Comprehensive Income Extensible List Not Disclosed Flag Settlement charges Settlement charges Settlement charges
Settlement charges $ (2) $ (1) $ (2)
Pension benefits      
Net periodic benefit cost      
Service cost 23 75 86
Interest cost 155 97 71
Expected return on plan assets (188) (157) (143)
Amortization of net losses and other deferred amounts 6 43 89
Curtailment gain 0 (13) 0
Other 1 1 (4)
Net periodic benefit cost (1) 47 101
OPEB      
Net periodic benefit cost      
Service cost 0 1 1
Interest cost 8 4 4
Curtailment gain (1) 0 0
Amortization of net losses and prior service credit (24) (14) (9)
Net periodic benefit cost $ (17) $ (9) $ (4)