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Provisions, including post-retirement benefits - Summary of Provisions, including post-retirement benefits (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Jan. 01, 2018
Disclosure of other provisions [Line Items]            
Provisions (including post-retirement benefits) at beginning balance $ 13,608 $ 14,642        
Adjustment to opening balance on transition to new accounting standard       $ (66)    
Restated opening balance       13,542   $ 14,642
Adjustment on currency translation 65 (898)        
Adjustments to mining properties:            
– changes in estimate 840 486        
Charged/(credited) to profit:            
– increases to existing and new provisions 850 1,137        
– unused amounts reversed (100) (144)        
– exchange losses on provisions 3 16        
– amortisation of discount 387 381        
Utilised in year (744) (837)        
Actuarial losses/(gains) recognised in equity 235 (781)        
Subsidiaries no longer consolidated   (318)        
Transfers and other movements 25 (76)        
Provisions (including post-retirement benefits) at ending balance 15,103 13,608        
Balance sheet analysis:            
Current     $ 1,399   $ 1,056  
Non-current     13,704   12,552  
Total 15,103 13,608 15,103   13,608  
Pensions and post retirement healthcare [member]            
Disclosure of other provisions [Line Items]            
Provisions (including post-retirement benefits) at beginning balance 2,486          
Restated opening balance       2,486    
Adjustment on currency translation 51          
Charged/(credited) to profit:            
– increases to existing and new provisions 166          
Utilised in year (205)          
Actuarial losses/(gains) recognised in equity 235          
Transfers and other movements (19)          
Provisions (including post-retirement benefits) at ending balance 2,714 2,486        
Balance sheet analysis:            
Current     73      
Non-current     2,641      
Total 2,714 2,486 2,714   2,486  
Other employee entitlements [member]            
Disclosure of other provisions [Line Items]            
Provisions (including post-retirement benefits) at beginning balance 360          
Restated opening balance       360    
Adjustment on currency translation (1)          
Charged/(credited) to profit:            
– increases to existing and new provisions 90          
– unused amounts reversed (20)          
Utilised in year (78)          
Transfers and other movements 3          
Provisions (including post-retirement benefits) at ending balance 354 360        
Balance sheet analysis:            
Current     260      
Non-current     94      
Total 354 360 354   360  
Close down and restoration/ environmental [member]            
Disclosure of other provisions [Line Items]            
Provisions (including post-retirement benefits) at beginning balance 9,975          
Restated opening balance       9,975    
Adjustment on currency translation 17          
Adjustments to mining properties:            
– changes in estimate 840          
Charged/(credited) to profit:            
– increases to existing and new provisions 171          
– unused amounts reversed (19)          
– exchange losses on provisions 3          
– amortisation of discount 383          
Utilised in year (330)          
Transfers and other movements 50          
Provisions (including post-retirement benefits) at ending balance 11,090 9,975        
Balance sheet analysis:            
Current     541      
Non-current     10,549      
Total 11,090 9,975 11,090   9,975  
Other [member]            
Disclosure of other provisions [Line Items]            
Provisions (including post-retirement benefits) at beginning balance 787          
Adjustment to opening balance on transition to new accounting standard       (66)    
Restated opening balance       $ 721    
Adjustment on currency translation (2)          
Charged/(credited) to profit:            
– increases to existing and new provisions 423          
– unused amounts reversed (61)          
– amortisation of discount 4          
Utilised in year (131)          
Transfers and other movements (9)          
Provisions (including post-retirement benefits) at ending balance 945 787        
Balance sheet analysis:            
Current     525      
Non-current     420      
Total $ 945 $ 787 $ 945   $ 787