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FINANCIAL RISK MANAGEMENT - Foreign currency risk (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Risk of exchange rate depreciation    
Foreign currency sensitivity    
Change in foreign exchange rate against US$ 10.00%  
Risk of exchange rate appreciation    
Foreign currency sensitivity    
Change in foreign exchange rate against US$ 10.00%  
Russian Ruble | Risk of exchange rate depreciation    
Foreign currency sensitivity    
Effect on profit / (loss) before tax $ 8 $ 14
Russian Ruble | Risk of exchange rate appreciation    
Foreign currency sensitivity    
Effect on profit / (loss) before tax (9) (16)
Bangladeshi Taka | Risk of exchange rate depreciation    
Foreign currency sensitivity    
Effect on profit / (loss) before tax (3) (30)
Bangladeshi Taka | Risk of exchange rate appreciation    
Foreign currency sensitivity    
Effect on profit / (loss) before tax 4 33
Pakistani Rupee | Risk of exchange rate depreciation    
Foreign currency sensitivity    
Effect on profit / (loss) before tax (3) (13)
Pakistani Rupee | Risk of exchange rate appreciation    
Foreign currency sensitivity    
Effect on profit / (loss) before tax 3 15
Ukrainian Hryvnia | Risk of exchange rate depreciation    
Foreign currency sensitivity    
Effect on profit / (loss) before tax 33 (2)
Ukrainian Hryvnia | Risk of exchange rate appreciation    
Foreign currency sensitivity    
Effect on profit / (loss) before tax (36) 2
Other currencies (net)* | Risk of exchange rate depreciation    
Foreign currency sensitivity    
Effect on profit / (loss) before tax (3) (3)
Other currencies (net)* | Risk of exchange rate appreciation    
Foreign currency sensitivity    
Effect on profit / (loss) before tax $ 2 $ 3