XML 48 R40.htm IDEA: XBRL DOCUMENT v3.21.2
Provisions and post-retirement benefits - Summary of Provisions, including post-retirement benefits (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Disclosure of other provisions [Line Items]    
Opening balance $ 17,665  
Adjustment on currency translation (109)  
Adjustments to mining properties/right of use assets:    
– changes in estimate 24  
Charged/(credited) to profit:    
– increases to existing and new provisions 502  
– decreases to existing provisions and unused amounts reversed (24)  
– exchange losses on provisions 7  
– amortisation of discount 207  
Utilised in the period (425)  
Actuarial gains recognised in equity (616)  
Transfers and other movements (321)  
Closing balance 16,910  
Balance sheet analysis:    
Current 1,834 $ 1,729
Non-current 15,076 15,936
Total 16,910 17,665
Pensions and post retirement healthcare    
Disclosure of other provisions [Line Items]    
Opening balance 3,055  
Adjustment on currency translation 41  
Adjustments to mining properties/right of use assets:    
– changes in estimate 0  
Charged/(credited) to profit:    
– increases to existing and new provisions 82  
– decreases to existing provisions and unused amounts reversed 0  
– exchange losses on provisions 0  
– amortisation of discount 0  
Utilised in the period (76)  
Actuarial gains recognised in equity (616)  
Transfers and other movements (291)  
Closing balance 2,195  
Balance sheet analysis:    
Current 71  
Non-current 2,124  
Total 2,195 3,055
Other employee entitlements    
Disclosure of other provisions [Line Items]    
Opening balance 419  
Adjustment on currency translation (10)  
Adjustments to mining properties/right of use assets:    
– changes in estimate 0  
Charged/(credited) to profit:    
– increases to existing and new provisions 60  
– decreases to existing provisions and unused amounts reversed (10)  
– exchange losses on provisions 0  
– amortisation of discount 0  
Utilised in the period (63)  
Actuarial gains recognised in equity 0  
Transfers and other movements 0  
Closing balance 396  
Balance sheet analysis:    
Current 306  
Non-current 90  
Total 396 419
Close down and restoration/ environmental    
Disclosure of other provisions [Line Items]    
Opening balance 13,335  
Adjustment on currency translation (133)  
Adjustments to mining properties/right of use assets:    
– changes in estimate 21  
Charged/(credited) to profit:    
– increases to existing and new provisions 265  
– decreases to existing provisions and unused amounts reversed (2)  
– exchange losses on provisions 7  
– amortisation of discount 206  
Utilised in the period (231)  
Actuarial gains recognised in equity 0  
Transfers and other movements (1)  
Closing balance 13,467  
Balance sheet analysis:    
Current 917  
Non-current 12,550  
Total 13,467 13,335
Other    
Disclosure of other provisions [Line Items]    
Opening balance 856  
Adjustment on currency translation (7)  
Adjustments to mining properties/right of use assets:    
– changes in estimate 3  
Charged/(credited) to profit:    
– increases to existing and new provisions 95  
– decreases to existing provisions and unused amounts reversed (12)  
– exchange losses on provisions 0  
– amortisation of discount 1  
Utilised in the period (55)  
Actuarial gains recognised in equity 0  
Transfers and other movements (29)  
Closing balance 852  
Balance sheet analysis:    
Current 540  
Non-current 312  
Total $ 852 $ 856