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PENSION AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension        
Defined Benefit Plan Disclosure [Line Items]        
Current service cost $ (4) $ (4) $ (13) $ (13)
Interest cost (6) (7) (17) (19)
Expected return on plan assets 6 6 17 17
Amortization of past service gain 0 0 1 1
Amortization of net actuarial gain 0 0 0 0
Total net pension and other long-term benefit cost (4) (5) (12) (14)
OPEB and Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Current service cost (1) (1) (3) (3)
Interest cost (1) (1) (5) (5)
Expected return on plan assets 0 0 0 0
Amortization of past service gain 3 3 8 8
Amortization of net actuarial gain 0 0 1 1
Total net pension and other long-term benefit cost $ 1 $ 1 $ 1 $ 1