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Provisions, including post-retirement benefits - Summary of Provisions, including post-retirement benefits (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other provisions [Line Items]      
Remaining lives of operations and infrastructure present closure obligation 17 years 20 years  
Remaining lives of operations and infrastructure one to over 60 years    
Close-down and restoration costs and environmental clean-up obligations $ 9,975 $ 9,983  
Risk free interest rate on provisions 2.00%    
Provision $ 13,608 14,642 $ 13,794
Non-current provisions $ 12,552 $ 13,367  
Diavik Diamond Mines (2012) Inc. [Member]      
Disclosure of other provisions [Line Items]      
Adjustment to record obligations for close-down and restoration 100.00% 60.00%  
Bottom of range [Member]      
Disclosure of other provisions [Line Items]      
Risk free interest rate on provisions 0.50%    
Top of range [Member]      
Disclosure of other provisions [Line Items]      
Provision $ 1,139    
Other employee entitlements [member]      
Disclosure of other provisions [Line Items]      
Provision for long service leave 242 $ 292  
Provision for redundancy and severance payments 46 24  
Provision 360 389  
Non-current provisions 86    
Close down and restoration/ environmental [member]      
Disclosure of other provisions [Line Items]      
Provision 9,975 9,983  
Non-current provisions 9,499    
Provisions relating to insurance recoveries and other financial assets held 110 75  
Close down and restoration/ environmental [member] | Between 1 and 5 years [Member]      
Disclosure of other provisions [Line Items]      
Non-current provisions 535 336  
Close down and restoration/ environmental [member] | After 5 years [Member]      
Disclosure of other provisions [Line Items]      
Non-current provisions $ 683 $ 839