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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, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other provisions [Line Items]          
Provisions (including post-retirement benefits) at beginning balance $ 15,103 $ 13,608      
Adjustment to opening balance on transition to new accounting standard(d)       $ 0 $ (66)
Restated opening balance       15,103 13,542
Adjustment on currency translation 890 65      
Adjustments to mining properties/right of use assets:          
– increases to existing and new provisions 141 840      
– change in discount rate 816 0      
Charged/(credited) to profit:          
– increases to existing and new provisions 1,074 850      
– change in discount rate 140 0      
– unused amounts reversed (299) (100)      
– exchange losses on provisions (22) 3      
– amortisation of discount 377 387      
Utilised in year (774) (744)      
Actuarial losses recognised in equity 250 235      
Transfers and other movements (31) 25      
Provisions (including post-retirement benefits) at ending balance 17,665 15,103      
Balance sheet analysis:          
Current     $ 1,729 1,399  
Non-current     15,936 13,704  
Total 15,103 15,103 17,665 15,103 $ 13,608
Pensions and post retirement healthcare          
Disclosure of other provisions [Line Items]          
Provisions (including post-retirement benefits) at beginning balance 2,714        
Adjustment to opening balance on transition to new accounting standard(d)       0  
Restated opening balance       2,714  
Adjustment on currency translation 83        
Adjustments to mining properties/right of use assets:          
– increases to existing and new provisions 0        
– change in discount rate 0        
Charged/(credited) to profit:          
– increases to existing and new provisions 200        
– change in discount rate 0        
– unused amounts reversed 0        
– exchange losses on provisions 0        
– amortisation of discount 0        
Utilised in year (192)        
Actuarial losses recognised in equity 250        
Transfers and other movements 0        
Provisions (including post-retirement benefits) at ending balance 3,055 2,714      
Balance sheet analysis:          
Current     70    
Non-current     2,985    
Total 3,055 2,714 3,055 2,714  
Other employee entitlements          
Disclosure of other provisions [Line Items]          
Provisions (including post-retirement benefits) at beginning balance 354        
Adjustment to opening balance on transition to new accounting standard(d)       0  
Restated opening balance       354  
Adjustment on currency translation 34        
Adjustments to mining properties/right of use assets:          
– increases to existing and new provisions 0        
– change in discount rate 0        
Charged/(credited) to profit:          
– increases to existing and new provisions 127        
– change in discount rate 0        
– unused amounts reversed (19)        
– exchange losses on provisions 0        
– amortisation of discount 0        
Utilised in year (77)        
Actuarial losses recognised in equity 0        
Transfers and other movements 0        
Provisions (including post-retirement benefits) at ending balance 419 354      
Balance sheet analysis:          
Current     327    
Non-current     92    
Total 419 354 419 354  
Close down and restoration/ environmental          
Disclosure of other provisions [Line Items]          
Provisions (including post-retirement benefits) at beginning balance 11,090        
Adjustment to opening balance on transition to new accounting standard(d)       0  
Restated opening balance       11,090  
Adjustment on currency translation 736        
Adjustments to mining properties/right of use assets:          
– increases to existing and new provisions 130        
– change in discount rate 816        
Charged/(credited) to profit:          
– increases to existing and new provisions 562        
– change in discount rate 138        
– unused amounts reversed (123)        
– exchange losses on provisions (21)        
– amortisation of discount 373        
Utilised in year (366)        
Actuarial losses recognised in equity 0        
Transfers and other movements 0        
Provisions (including post-retirement benefits) at ending balance 13,335 11,090      
Balance sheet analysis:          
Current     777    
Non-current     12,558    
Total 11,090 11,090 13,335 11,090  
Other          
Disclosure of other provisions [Line Items]          
Provisions (including post-retirement benefits) at beginning balance 945        
Adjustment to opening balance on transition to new accounting standard(d)       0  
Restated opening balance       945  
Adjustment on currency translation 37        
Adjustments to mining properties/right of use assets:          
– increases to existing and new provisions 11        
– change in discount rate 0        
Charged/(credited) to profit:          
– increases to existing and new provisions 185        
– change in discount rate 2        
– unused amounts reversed (157)        
– exchange losses on provisions (1)        
– amortisation of discount 4        
Utilised in year (139)        
Actuarial losses recognised in equity 0        
Transfers and other movements (31)        
Provisions (including post-retirement benefits) at ending balance 856 945      
Balance sheet analysis:          
Current     555    
Non-current     301    
Total $ 856 $ 945 $ 856 $ 945