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PENSION AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Schedule of net benefit costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Current service cost $ (22) $ (22)  
Interest cost (31) (34)  
Expected return on plan assets (22) (26)  
Immediate recognition of gains arising over the year 0 (1)  
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Current service cost (18) (16) $ (21)
Interest cost (24) (27) (14)
Expected return on plan assets 22 26 20
Immediate recognition of gains arising over the year 0 0 0
Amortization of past service (cost) / gain 2 2 2
Amortization of net actuarial (loss) / gain (2) 1 (2)
Curtailment and settlements 0 0 0
Total net pension and other long-term benefit cost (20) (14) (15)
OPEB and Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Current service cost (4) (6) (8)
Interest cost (7) (7) (7)
Expected return on plan assets 0 0 0
Immediate recognition of gains arising over the year 0 (1) 5
Amortization of past service (cost) / gain 10 10 3
Amortization of net actuarial (loss) / gain 1 1 (1)
Curtailment and settlements 0 0 0
Total net pension and other long-term benefit cost $ 0 $ (3) $ (8)