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New Standards and Interpretations Adopted in the Current Year - Additional information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Disclosure of initial application of standards or interpretations [Line Items]        
Reclassification of retained earnings to cost of hedging reserve $ 22      
Reclassification of cash flow hedge reserve to cost of hedging reserve 4      
Transition adjustment reduction in trade and other receivables       $ 235
Transition adjustment reduction in deferred tax liabilities       71
Consolidated sales revenue 40,522 $ 40,030 $ 33,781  
Increase (decrease) due to changes in accounting policy required by IFRSs [Member]        
Disclosure of initial application of standards or interpretations [Line Items]        
Consolidated sales revenue $ (19)      
Retained earnings [Member]        
Disclosure of initial application of standards or interpretations [Line Items]        
De-recognition of receivable arising from uplift transaction       164
Transition adjustment reduction in trade and other receivables       235
Bottom of range [Member]        
Disclosure of initial application of standards or interpretations [Line Items]        
Period to determine final prices for copper concentrate 30 days      
Top of range [Member]        
Disclosure of initial application of standards or interpretations [Line Items]        
Period to determine final prices for copper concentrate 180 days      
IFRS 9 [member]        
Disclosure of initial application of standards or interpretations [Line Items]        
Impairment provision resulting from the application of the ECL model       $ 7