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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]    
Capital commitments $ 1,382 $ 1,119
Operating lease commitments 68  
Less than 1 year    
Disclosure of detailed information about property, plant and equipment [line items]    
Operating lease commitments 21  
Payable within two to five years    
Disclosure of detailed information about property, plant and equipment [line items]    
Operating lease commitments 46  
Over 5 years    
Disclosure of detailed information about property, plant and equipment [line items]    
Operating lease commitments 2  
MIning property costs subject to depreciation | Revision of LOM Plan    
Disclosure of detailed information about property, plant and equipment [line items]    
Accumulated expense decrease 91 67
Construction activities    
Disclosure of detailed information about property, plant and equipment [line items]    
Capital commitments $ 118 $ 103