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Provisions (including post-retirement benefits) - Summary of Provisions, including post-retirement benefits (Detail)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure of other provisions [Line Items]        
Provisions (including post-retirement benefits), beginning balance $ 17,665   $ 15,103  
Adjustment on currency translation (546)   890  
Adjustments to mining properties/right of use assets:        
– increases to existing and new provisions 521   141  
– change in discount rate 0   816  
Charged/(credited) to profit:        
– increases to existing and new provisions 2,130   1,074  
– change in discount rate 0   140  
– unused amounts reversed (250)   (299)  
– exchange losses on provisions 23   (22)  
– amortisation of discount 418   377  
Utilised in year (900)   (774)  
Re-measurement (gains)/losses recognised in other comprehensive income (687)   250  
Transfers and other movements (338)   (31)  
Provisions (including post-retirement benefits), ending balance 18,036   17,665 $ 15,103
Balance sheet analysis:        
Current 2,106   1,729  
Non-current 15,930   15,936  
Total 18,036   17,665 15,103
Post-employment benefit expense, defined benefit plans 239   205 $ 146
Present value of defined benefit obligation        
Balance sheet analysis:        
Settlements 380   6  
FRANCE        
Balance sheet analysis:        
Post-employment benefit expense, defined benefit plans 3      
FRANCE | Present value of defined benefit obligation        
Balance sheet analysis:        
Settlements 294 € 247    
Pensions and post-retirement healthcare        
Disclosure of other provisions [Line Items]        
Provisions (including post-retirement benefits), beginning balance 3,055      
Adjustment on currency translation (11)      
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 161      
– change in discount rate 0      
– unused amounts reversed 0      
– exchange losses on provisions 0      
– amortisation of discount 0      
Utilised in year (129)      
Re-measurement (gains)/losses recognised in other comprehensive income (687)      
Transfers and other movements (291)      
Provisions (including post-retirement benefits), ending balance 2,098   3,055  
Balance sheet analysis:        
Current 66      
Non-current 2,032      
Total 2,098   3,055  
Pension asset value transferred 89      
Other employee entitlements        
Disclosure of other provisions [Line Items]        
Provisions (including post-retirement benefits), beginning balance 419      
Adjustment on currency translation (23)      
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 112      
– change in discount rate 0      
– unused amounts reversed (21)      
– exchange losses on provisions 0      
– amortisation of discount 0      
Utilised in year (102)      
Re-measurement (gains)/losses recognised in other comprehensive income 0      
Transfers and other movements 9      
Provisions (including post-retirement benefits), ending balance 394   419  
Balance sheet analysis:        
Current 317      
Non-current 77      
Total 394   419  
Close down and restoration/ environmental        
Disclosure of other provisions [Line Items]        
Provisions (including post-retirement benefits), beginning balance 13,335      
Adjustment on currency translation (483)      
Adjustments to mining properties/right of use assets:        
– increases to existing and new provisions 518      
– change in discount rate 0      
Charged/(credited) to profit:        
– increases to existing and new provisions 1,475      
– change in discount rate 0      
– unused amounts reversed (192)      
– exchange losses on provisions 23      
– amortisation of discount 415      
Utilised in year (541)      
Re-measurement (gains)/losses recognised in other comprehensive income 0      
Transfers and other movements (8)      
Provisions (including post-retirement benefits), ending balance 14,542   13,335  
Balance sheet analysis:        
Current 1,023      
Non-current 13,519      
Total 14,542   13,335  
Other        
Disclosure of other provisions [Line Items]        
Provisions (including post-retirement benefits), beginning balance 856      
Adjustment on currency translation (29)      
Adjustments to mining properties/right of use assets:        
– increases to existing and new provisions 3      
– change in discount rate 0      
Charged/(credited) to profit:        
– increases to existing and new provisions 382      
– change in discount rate 0      
– unused amounts reversed (37)      
– exchange losses on provisions 0      
– amortisation of discount 3      
Utilised in year (128)      
Re-measurement (gains)/losses recognised in other comprehensive income 0      
Transfers and other movements (48)      
Provisions (including post-retirement benefits), ending balance 1,002   856  
Balance sheet analysis:        
Current 700      
Non-current 302      
Total $ 1,002   $ 856