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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Pension benefits        
Net periodic benefit cost        
Service cost $ 4 $ 6 $ 13 $ 18
Interest cost 33 45 123 137
Expected return on plan assets (43) (57) (160) (166)
Amortization of net losses and prior service costs 4 1 11 4
Net periodic pension cost (income) (2) (5) (13) (7)
OPEB        
Net periodic benefit cost        
Interest cost 2 2 6 6
Amortization of net losses and prior service costs (5) (6) (14) (18)
Net periodic pension cost (income) $ (3) $ (4) $ (8) $ (12)