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PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Pension Benefits        
Components of net periodic cost        
Interest cost $ 50 $ 49 $ 100 $ 99
Expected return on plan assets (35) (32) (70) (64)
Amortization of actuarial loss (gain) 0 19 0 37
Net periodic cost 15 36 30 72
Postretirement Benefits        
Components of net periodic cost        
Interest cost 2 3 4 5
Expected return on plan assets 0 0 0 0
Amortization of actuarial loss (gain) 0 (5) 0 (9)
Net periodic cost $ 2 $ (2) $ 4 $ (4)