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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]    
Capital commitments $ 1,443 $ 1,382
Operating lease commitments 167  
Less than 1 year    
Disclosure of detailed information about property, plant and equipment [line items]    
Operating lease commitments 60  
Payable within two to five years    
Disclosure of detailed information about property, plant and equipment [line items]    
Operating lease commitments 105  
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 85 91
Construction activities    
Disclosure of detailed information about property, plant and equipment [line items]    
Capital commitments $ 82 $ 118