v3.25.4
PERSONNEL EXPENSES AND DEFERRED EMPLOYEE BENEFITS - Net Periodic Other Post-Employment Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of net defined benefit liability (asset) [line items]      
Total $ 232 $ 166 $ 249
Other post-employment benefits and other long-term employee benefits ("OPEB")      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 28 28 27
Past service cost - Plan amendments (1) (8) 6
Past service cost - Curtailments (9) (3)  
Net interest cost 43 42 46
Actuarial gain recognized during the year (5) 4 (11)
Total 56 55 90
Canada | Other post-employment benefits and other long-term employee benefits ("OPEB")      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 7 7 7
Past service cost - Plan amendments (1) 0 0
Past service cost - Curtailments (2) 0  
Net interest cost 23 23 24
Actuarial gain recognized during the year 0 0 0
Total 27 30 31
Europe | Other post-employment benefits and other long-term employee benefits ("OPEB")      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 17 18 17
Past service cost - Plan amendments 0 (3) (2)
Past service cost - Curtailments (7) (3)  
Net interest cost 12 12 14
Actuarial gain recognized during the year (5) 4 (11)
Total 17 20 40
Others | Other post-employment benefits and other long-term employee benefits ("OPEB")      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 4 3 3
Past service cost - Plan amendments 0 (5) 8
Past service cost - Curtailments 0 0  
Net interest cost 8 7 8
Actuarial gain recognized during the year 0 0 0
Total $ 12 $ 5 $ 19