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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, 2022
Jun. 30, 2021
Dec. 31, 2021
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance $ 18,053    
Adjustment on currency translation (587)    
Adjustments to mining properties/right of use assets:      
increases to existing and new provisions 345    
Charged/(credited) to profit:      
-Increases to existing and new provisions 525    
– unused amounts reversed (54)    
– exchange losses on provisions 25    
-amortisation of discount 504    
Utilised in the period (429)    
Re-measurement gains recognised in other comprehensive income (739)    
Transfers and other movements (11)    
Provisions (including post-retirement benefits), ending balance 17,632   $ 18,053
Balance sheet analysis:      
Current 2,308   2,106
Non-current 15,324   15,930
Total 17,632   18,053
Previously stated      
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance 18,036    
Charged/(credited) to profit:      
Provisions (including post-retirement benefits), ending balance     18,036
Balance sheet analysis:      
Total     18,036
Increase (decrease) due to changes in accounting policy required by IFRSs      
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance 17    
Charged/(credited) to profit:      
Provisions (including post-retirement benefits), ending balance     17
Balance sheet analysis:      
Total     17
Pensions and post-retirement healthcare      
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance 2,098    
Adjustment on currency translation (20)    
Adjustments to mining properties/right of use assets:      
increases to existing and new provisions 0    
Charged/(credited) to profit:      
-Increases to existing and new provisions 62    
– unused amounts reversed 0    
– exchange losses on provisions 0    
-amortisation of discount 0    
Utilised in the period (66)    
Re-measurement gains recognised in other comprehensive income (739)    
Transfers and other movements 0    
Provisions (including post-retirement benefits), ending balance 1,335   2,098
Balance sheet analysis:      
Current 68    
Non-current 1,267    
Total 1,335   2,098
Pensions and post-retirement healthcare | Previously stated      
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance 2,098    
Charged/(credited) to profit:      
Provisions (including post-retirement benefits), ending balance     2,098
Balance sheet analysis:      
Total     2,098
Pensions and post-retirement healthcare | Increase (decrease) due to changes in accounting policy required by IFRSs      
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance 0    
Charged/(credited) to profit:      
Provisions (including post-retirement benefits), ending balance     0
Balance sheet analysis:      
Total     0
Other employee entitlements      
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance 394    
Adjustment on currency translation (19)    
Adjustments to mining properties/right of use assets:      
increases to existing and new provisions 0    
Charged/(credited) to profit:      
-Increases to existing and new provisions 57    
– unused amounts reversed (10)    
– exchange losses on provisions 0    
-amortisation of discount 0    
Utilised in the period (56)    
Re-measurement gains recognised in other comprehensive income 0    
Transfers and other movements 0    
Provisions (including post-retirement benefits), ending balance 366   394
Balance sheet analysis:      
Current 293    
Non-current 73    
Total 366   394
Provision for long service leave 275   272
Provisions for redundancy and severance payments 31   60
Other employee entitlements | Previously stated      
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance 394    
Charged/(credited) to profit:      
Provisions (including post-retirement benefits), ending balance     394
Balance sheet analysis:      
Total     394
Other employee entitlements | Increase (decrease) due to changes in accounting policy required by IFRSs      
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance 0    
Charged/(credited) to profit:      
Provisions (including post-retirement benefits), ending balance     0
Balance sheet analysis:      
Total     0
Close down and restoration/ environmental      
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance 14,542    
Adjustment on currency translation (514)    
Adjustments to mining properties/right of use assets:      
increases to existing and new provisions 345    
Charged/(credited) to profit:      
-Increases to existing and new provisions 206    
– unused amounts reversed (18)    
– exchange losses on provisions 24    
Utilised in the period (256)    
Re-measurement gains recognised in other comprehensive income 0    
Transfers and other movements 3    
Provisions (including post-retirement benefits), ending balance 14,835   14,542
Balance sheet analysis:      
Current 1,145    
Non-current 13,690    
Total 14,835   14,542
Closure related receivables 391   410
Close down and restoration/ environmental | Amortisation of discount      
Charged/(credited) to profit:      
-amortisation of discount 503 $ 207  
Close down and restoration/ environmental | Adjustments to mining properties      
Charged/(credited) to profit:      
-amortisation of discount 360    
Close down and restoration/ environmental | Operating cost      
Charged/(credited) to profit:      
-amortisation of discount 180    
Close down and restoration/ environmental | Previously stated      
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance 14,542    
Charged/(credited) to profit:      
Provisions (including post-retirement benefits), ending balance     14,542
Balance sheet analysis:      
Total     14,542
Close down and restoration/ environmental | Increase (decrease) due to changes in accounting policy required by IFRSs      
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance 0    
Charged/(credited) to profit:      
Provisions (including post-retirement benefits), ending balance     0
Balance sheet analysis:      
Total     0
Other      
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance 1,019    
Adjustment on currency translation (34)    
Adjustments to mining properties/right of use assets:      
increases to existing and new provisions 0    
Charged/(credited) to profit:      
-Increases to existing and new provisions 200    
– unused amounts reversed (26)    
– exchange losses on provisions 1    
-amortisation of discount 1    
Utilised in the period (51)    
Re-measurement gains recognised in other comprehensive income 0    
Transfers and other movements (14)    
Provisions (including post-retirement benefits), ending balance 1,096   1,019
Balance sheet analysis:      
Current 802    
Non-current 294    
Total 1,096   1,019
Other | Previously stated      
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance 1,002    
Charged/(credited) to profit:      
Provisions (including post-retirement benefits), ending balance     1,002
Balance sheet analysis:      
Total     1,002
Other | Increase (decrease) due to changes in accounting policy required by IFRSs      
Disclosure of other provisions [Line Items]      
Provisions (including post-retirement benefits), beginning balance $ 17    
Charged/(credited) to profit:      
Provisions (including post-retirement benefits), ending balance     17
Balance sheet analysis:      
Total     $ 17