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Provisions including post-retirement benefits - Summary of provisions, including post-retirement benefits (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance $ 18,715 $ 18,053 $ 18,053
Adjustment on currency translation (98)   (841)
Adjustments to mining properties/right of use assets:      
– changes to existing and new provisions (55)   524
– change in discount rate (960)   0
Charged/(credited) to profit:      
– increases to existing and new provisions 336   1,137
– change in discount rate (184)   0
– decreases and unused amounts reversed (78)   (150)
– exchange (gains)/losses on provisions (11)   17
-amortisation of discount 592   1,519
Utilised in the period (492)   (1,039)
Re-measurement losses/(gains) recognised in other comprehensive income 42   (701)
Transfers and other movements (15)   196
Provisions (including post-retirement benefits), ending balance 17,792   18,715
Balance sheet analysis:      
Current 2,125   2,049
Non-current 15,667   16,666
Total 17,792   18,715
Post-retirement benefits and other employee entitlements      
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance 1,658    
Adjustment on currency translation 14    
Adjustments to mining properties/right of use assets:      
– changes to existing and new provisions 0    
– change in discount rate 0    
Charged/(credited) to profit:      
– increases to existing and new provisions 100    
– change in discount rate 0    
– decreases and unused amounts reversed (2)    
– exchange (gains)/losses on provisions 0    
Utilised in the period (115)    
Re-measurement losses/(gains) recognised in other comprehensive income 42    
Transfers and other movements 1    
Provisions (including post-retirement benefits), ending balance 1,698   1,658
Balance sheet analysis:      
Current 352    
Non-current 1,346    
Total 1,698   1,658
Provision for long service leave 281   271
Provisions for redundancy and severance payments 28   32
Post-retirement benefits and other employee entitlements | Amortisation of discount      
Charged/(credited) to profit:      
-amortisation of discount 0    
Close down restoration and environmental      
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance 15,759    
Adjustment on currency translation (105)    
Adjustments to mining properties/right of use assets:      
– changes to existing and new provisions (55)    
– change in discount rate (960)    
Charged/(credited) to profit:      
– increases to existing and new provisions 185    
– change in discount rate (166)    
– decreases and unused amounts reversed (52)    
– exchange (gains)/losses on provisions (9)    
Utilised in the period (333)    
Re-measurement losses/(gains) recognised in other comprehensive income 0    
Transfers and other movements 4    
Provisions (including post-retirement benefits), ending balance 14,846   15,759
Balance sheet analysis:      
Current 1,249    
Non-current 13,597    
Total 14,846   15,759
Closure related receivables $ 348   $ 351
Actuarial assumption of discount rates 2.00% 1.50% 1.50%
Close down restoration and environmental | Amortisation of discount      
Charged/(credited) to profit:      
-amortisation of discount $ 578 $ 503  
Other provisions      
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance 1,298    
Adjustment on currency translation (7)    
Adjustments to mining properties/right of use assets:      
– changes to existing and new provisions 0    
– change in discount rate 0    
Charged/(credited) to profit:      
– increases to existing and new provisions 51    
– change in discount rate (18)    
– decreases and unused amounts reversed (24)    
– exchange (gains)/losses on provisions (2)    
-amortisation of discount 14    
Utilised in the period (44)    
Re-measurement losses/(gains) recognised in other comprehensive income 0    
Transfers and other movements (20)    
Provisions (including post-retirement benefits), ending balance 1,248   $ 1,298
Balance sheet analysis:      
Current 524    
Non-current 724    
Total $ 1,248   $ 1,298