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EQUITY ACCOUNTING METHOD INVESTMENT CONTINUITY (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Disclosure of joint ventures [line items]          
Investments, beginning balance     $ 1,213    
Equity pick-up (loss) from equity investees $ (10) $ (14) (26) $ (25)  
Investments, ending balance 1,214   1,214   $ 1,213
Impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9 59 $ (5) 61 (1,130)  
Joint ventures [member]          
Disclosure of joint ventures [line items]          
Investments, beginning balance     1,213 1,185 1,185
Equity pick-up (loss) from equity investees     26   76
Funds invested     5   12
Dividend         (60)
Investments, ending balance 1,214   1,214   1,213
Impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9     (30)    
Kabanga [Member]          
Disclosure of joint ventures [line items]          
Investments, beginning balance     30 30 30
Equity pick-up (loss) from equity investees     0   (1)
Funds invested     0   1
Dividend         0
Investments, ending balance 0   0   30
Impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9     (30)    
Jabal Sayid          
Disclosure of joint ventures [line items]          
Investments, beginning balance     206 180 180
Equity pick-up (loss) from equity investees     19   26
Funds invested     0   0
Dividend         0
Investments, ending balance 225   225   206
Impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9     0    
Zaldívar          
Disclosure of joint ventures [line items]          
Investments, beginning balance     975 974 974
Equity pick-up (loss) from equity investees     14   61
Funds invested     0   0
Dividend         (60)
Investments, ending balance 989   989   975
Impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9     0    
GNX          
Disclosure of joint ventures [line items]          
Investments, beginning balance     2 $ 1 1
Equity pick-up (loss) from equity investees     (7)   (10)
Funds invested     5   11
Dividend         0
Investments, ending balance $ 0   0   $ 2
Impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9     $ 0