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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 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Pension benefits        
Net periodic benefit cost        
Service cost $ 7 $ 19 $ 20 $ 59
Interest cost 36 25 108 73
Expected return on plan assets (44) (39) (131) (118)
Amortization of net losses and prior service costs 1 10 3 33
Net periodic pension cost (income) 0 15 0 47
OPEB        
Net periodic benefit cost        
Interest cost 2 1 6 3
Amortization of net losses and prior service costs (6) (3) (18) (9)
Net periodic pension cost (income) $ (4) $ (2) $ (12) $ (6)