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FINANCIAL RISK MANAGEMENT - Interest rate risk (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
INTEREST RATE RISK    
FINANCIAL RISK MANAGEMENT    
Percent of borrowings that are at a fixed rate of interest 80.00% 81.00%
Interest rate appreciation risk    
FINANCIAL RISK MANAGEMENT    
Percentage of change in significant exposure used for sensitivity analysis 100.00% 100.00%
Interest rate depreciation risk    
FINANCIAL RISK MANAGEMENT    
Percentage of change in significant exposure used for sensitivity analysis 100.00% 100.00%
Euro | Interest rate appreciation risk    
FINANCIAL RISK MANAGEMENT    
Effect on profit / (loss) before tax $ (7)  
Effect on other comprehensive income 23  
Euro | Interest rate depreciation risk    
FINANCIAL RISK MANAGEMENT    
Effect on profit / (loss) before tax 7  
Effect on other comprehensive income (24)  
Algerian Dinar | Interest rate appreciation risk    
FINANCIAL RISK MANAGEMENT    
Effect on profit / (loss) before tax   $ (1)
Algerian Dinar | Interest rate depreciation risk    
FINANCIAL RISK MANAGEMENT    
Effect on profit / (loss) before tax   1
Uzbek Som | Interest rate appreciation risk    
FINANCIAL RISK MANAGEMENT    
Effect on profit / (loss) before tax 3 7
Effect on other comprehensive income (20)  
Uzbek Som | Interest rate depreciation risk    
FINANCIAL RISK MANAGEMENT    
Effect on profit / (loss) before tax (3) (7)
Effect on other comprehensive income 21  
Pakistani Rupee | Interest rate appreciation risk    
FINANCIAL RISK MANAGEMENT    
Effect on profit / (loss) before tax (3)  
Effect on other comprehensive income 1 2
Pakistani Rupee | Interest rate depreciation risk    
FINANCIAL RISK MANAGEMENT    
Effect on profit / (loss) before tax 3  
Effect on other comprehensive income (1) (2)
Ukrainian Hryvnia | Interest rate appreciation risk    
FINANCIAL RISK MANAGEMENT    
Effect on profit / (loss) before tax 2 1
Ukrainian Hryvnia | Interest rate depreciation risk    
FINANCIAL RISK MANAGEMENT    
Effect on profit / (loss) before tax (2) (1)
Other currencies | Interest rate appreciation risk    
FINANCIAL RISK MANAGEMENT    
Effect on profit / (loss) before tax 4 2
Other currencies | Interest rate depreciation risk    
FINANCIAL RISK MANAGEMENT    
Effect on profit / (loss) before tax $ (4) $ (2)