v3.26.1
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, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Pension benefits        
Net periodic benefit cost        
Service cost $ 2 $ 3 $ 5 $ 6
Interest cost 33 34 64 68
Expected return on plan assets (43) (44) (85) (88)
Amortization of net losses and prior service costs 3 1 6 2
Net periodic cost (income) (5) (6) (10) (12)
OPEB        
Net periodic benefit cost        
Interest cost 2 2 3 4
Amortization of net losses and prior service costs (1) (4) (1) (8)
Net periodic cost (income) $ 1 $ (2) $ 2 $ (4)