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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Net Periodic Benefit Cost Relating to Pension and Other Postemployment Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Pension benefits        
Net periodic benefit cost        
Service cost $ 22 $ 20 $ 44 $ 41
Interest cost 18 23 36 47
Expected return on plan assets (36) (40) (72) (81)
Amortization of net losses and prior service costs 23 19 46 38
Net periodic cost 27 22 54 45
OPEB        
Net periodic benefit cost        
Interest cost 1 1 2 2
Amortization of net losses and prior service costs (3) (4) (5) (8)
Net periodic cost $ (2) $ (3) $ (3) $ (6)