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FINANCIAL ASSETS AND LIABILITIES - Derivative and hedging activities (Details)
€ in Millions, ₨ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
PKR (₨)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
PKR (₨)
Available facilities                    
Other comprehensive loss, net of tax, exchange differences on translation   $ 638 $ (85) $ 1,836            
Total outstanding amount           $ 11,103     $ 10,489  
Cross currency swaps                    
Available facilities                    
Facility amount € 537           $ 600      
Swaps term (in years) 4 years                  
Foreign exchange contracts | Net investment hedge accounting                    
Available facilities                    
Other comprehensive loss, net of tax, exchange differences on translation   $ 125                
Term loan | Net investment hedge accounting                    
Available facilities                    
Facility amount | €         € 627          
Interest rate swap contracts                    
Available facilities                    
Total outstanding amount | ₨               ₨ 10,350   ₨ 16,483
Fixed interest rate | Minimum | Interest rate swap contracts                    
Available facilities                    
Interest rate (as a percent)         8.15% 8.15%        
Fixed interest rate | Maximum | Interest rate swap contracts                    
Available facilities                    
Interest rate (as a percent)         8.72% 8.72%