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INVESTMENTS IN JOINT VENTURES AND ASSOCIATES - Impairment of Euroset (Details)
€ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
EUR (€)
Statement of financial position            
Impairment Loss | $     $ 66 $ 192 $ 245  
Euroset            
Statement of financial position            
Impairment Loss | $   $ 99        
Discount rate (functional currency) 13.40% 16.00%        
Average annual revenue growth rate during forecast period (functional currency ) 1.70% 4.50%        
Terminal growth rate 0.00% 1.00%        
Average operating (EBITDA) margin during forecast period 0.00% 3.70%        
Average capital expenditure as a percentage of revenue 0.90% 0.40%        
Proportion of ownership interest in joint venture     50.00% 50.00%    
VIP-CKH Luxembourg S.a.r.l            
Statement of financial position            
Proportion of ownership interest in joint venture     50.00% 50.00%    
Shareholder loan payable | €           € 5,114
VIP CKH Ireland Limited            
Statement of financial position            
Proportion of ownership interest in joint venture     50.00% 50.00%    
Shareholder loan receivable | €           € 5,114