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REVENUES REVENUES (Geographic Information) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disclosure of geographical areas [line items]        
Revenues $ 1,044 $ 934 $ 2,057 $ 1,590
BRAZIL        
Disclosure of geographical areas [line items]        
Revenues 278   583  
AUSTRALIA        
Disclosure of geographical areas [line items]        
Revenues 288   572  
UNITED KINGDOM        
Disclosure of geographical areas [line items]        
Revenues 166   325  
CANADA        
Disclosure of geographical areas [line items]        
Revenues 47   124  
UNITED STATES        
Disclosure of geographical areas [line items]        
Revenues 42   83  
CHILE        
Disclosure of geographical areas [line items]        
Revenues 43   88  
COLOMBIA        
Disclosure of geographical areas [line items]        
Revenues 127   171  
Aggregated Individually Immaterial Geographical Areas [Member]        
Disclosure of geographical areas [line items]        
Revenues $ 53   $ 111