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INVESTMENTS IN JOINT VENTURES AND ASSOCIATES - Investments in associates and joint ventures (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investments in associates and joint ventures      
Balance at the beginning of the period $ 2,179 $ 201 $ 265
Acquisitions   2,113  
Share of (loss) / profit of joint ventures and associates (412) 48 14
Reclassified to assets held for sale     (19)
Share of other comprehensive loss of joint ventures (12)    
Impairment of joint ventures and associates (110) (99)  
Foreign currency translation 276 (84) (59)
Balance at the end of the period 1,921 2,179 201
Italy Joint Venture      
Investments in associates and joint ventures      
Balance at the beginning of the period 2,053    
Acquisitions   2,113  
Share of (loss) / profit of joint ventures and associates (390) 59  
Share of other comprehensive loss of joint ventures (12)    
Foreign currency translation 270 (119)  
Balance at the end of the period 1,921 2,053  
Euroset      
Investments in associates and joint ventures      
Balance at the beginning of the period 126 199 237
Share of (loss) / profit of joint ventures and associates (22) (10) 18
Impairment of joint ventures and associates (110) (99)  
Foreign currency translation $ 6 36 (56)
Balance at the end of the period   126 199
Other      
Investments in associates and joint ventures      
Balance at the beginning of the period   2 28
Share of (loss) / profit of joint ventures and associates   (1) (4)
Reclassified to assets held for sale     (19)
Foreign currency translation   $ (1) (3)
Balance at the end of the period     $ 2