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PENSION AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Movement in net defined movement obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Defined benefit obligation, beginning period $ 994 $ 922  
Current service cost 22 22  
Interest cost 31 34  
Immediate recognition of gains arising over the year 0 1  
Remeasurement due to changes in financial assumptions (16) 37  
Remeasurement due to changes in demographic assumptions 0 0  
Remeasurement due to experience (gains)/losses 5 (1)  
Past service cost   (1)  
Effects of changes in foreign exchange rates (39) 37  
Benefits paid (61) (58)  
Settlement (24)    
Contributions by the plan participants 5 5  
Disposed of through business combination   (4)  
Defined benefit obligation, ending period $ 917 $ 994 $ 922
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Finance costs - net Finance costs - net  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Plan assets, beginning period $ (539) $ (492)  
Interest income (22) (26)  
Remeasurements due to actual return less interest on plan assets (9) (5)  
Effects of changes in foreign exchange rates 22 (28)  
Benefits paid 37 39  
Settlement 24    
Contributions by the Group (28) (22)  
Contributions by the plan participants (5) (5)  
Disposed of through business combination   0  
Plan assets, ending period $ (520) $ (539) (492)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Finance costs - net Finance costs - net  
Defined Benefit Plan, Change in Net Defined Benefit Liability [Roll Forward]      
Net defined benefit liability, beginning period $ 455 $ 430  
Current service cost 22 22  
Interest cost / (income) 9 8 1
Immediate recognition of gains arising over the year 0 1  
Remeasurements due to actual return less interest on plan assets (9) (5)  
Remeasurement due to changes in financial assumptions (16) 37  
Remeasurement due to changes in demographic assumptions 0 0  
Remeasurement due to experience (gains)/losses 5 (1)  
Past service cost   (1)  
Effects of changes in foreign exchange rates (17) 9  
Benefits paid (24) (19)  
Settlement 0    
Contributions by the Group (28) (22)  
Contributions by the plan participants 0 0  
Disposed of through business combination   (4)  
Net defined benefit liability, ending period 397 455 430
Pension      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Defined benefit obligation, beginning period 835 758  
Current service cost 18 16 21
Interest cost 24 27 14
Immediate recognition of gains arising over the year 0 0 0
Remeasurement due to changes in financial assumptions (9) 35  
Remeasurement due to changes in demographic assumptions 0 0  
Remeasurement due to experience (gains)/losses 7 4  
Past service cost   (1)  
Effects of changes in foreign exchange rates (38) 36  
Benefits paid (45) (42)  
Settlement (24)    
Contributions by the plan participants 5 5  
Disposed of through business combination   (3)  
Defined benefit obligation, ending period 773 835 758
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Plan assets, beginning period (539)    
Interest income 22 26 20
Plan assets, ending period (520) (539)  
Defined Benefit Plan, Change in Net Defined Benefit Liability [Roll Forward]      
Net defined benefit liability, beginning period 296    
Current service cost 18 16 21
Immediate recognition of gains arising over the year 0 0 0
Remeasurement due to changes in financial assumptions (9) 35  
Remeasurement due to changes in demographic assumptions 0 0  
Remeasurement due to experience (gains)/losses 7 4  
Past service cost   (1)  
Net defined benefit liability, ending period 253 296  
OPEB and Other Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Defined benefit obligation, beginning period 159 164  
Current service cost 4 6 8
Interest cost 7 7 7
Immediate recognition of gains arising over the year 0 1 (5)
Remeasurement due to changes in financial assumptions (7) 2  
Remeasurement due to changes in demographic assumptions 0 0  
Remeasurement due to experience (gains)/losses (2) (5)  
Past service cost   0  
Effects of changes in foreign exchange rates (1) 1  
Benefits paid (16) (16)  
Settlement 0    
Contributions by the plan participants 0 0  
Disposed of through business combination   (1)  
Defined benefit obligation, ending period 144 159 164
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Interest income 0 0 0
Defined Benefit Plan, Change in Net Defined Benefit Liability [Roll Forward]      
Net defined benefit liability, beginning period 159    
Current service cost 4 6 8
Immediate recognition of gains arising over the year 0 1 $ (5)
Remeasurement due to changes in financial assumptions (7) 2  
Remeasurement due to changes in demographic assumptions 0 0  
Remeasurement due to experience (gains)/losses (2) (5)  
Past service cost   0  
Net defined benefit liability, ending period $ 144 $ 159