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Provisions and post-retirement benefits - Summary of Provisions, including post-retirement benefits (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Disclosure of other provisions [Line Items]      
Opening balance $ 15,103    
Adjustment on currency translation (298)    
Adjustments to property, plant and equipment:      
– changes in estimate 84    
Charged/(credited) to profit:      
– increases to existing and new provisions 504    
– decreases to existing provisions and unused amounts reversed (168)    
– amortisation of discount 216    
Utilised in the period (351)    
Actuarial losses recognised in equity 345    
Transfers and other movements (32)    
Closing balance 15,403    
Balance sheet analysis:      
Current   $ 1,480 $ 1,399
Non-current   13,923 13,704
Total 15,403 15,403 15,103
Pensions and post retirement healthcare      
Disclosure of other provisions [Line Items]      
Opening balance 2,714    
Adjustment on currency translation (81)    
Adjustments to property, plant and equipment:      
– changes in estimate 0    
Charged/(credited) to profit:      
– increases to existing and new provisions 97    
– decreases to existing provisions and unused amounts reversed 0    
– amortisation of discount 0    
Utilised in the period (97)    
Actuarial losses recognised in equity 345    
Transfers and other movements 0    
Closing balance 2,978    
Balance sheet analysis:      
Current   71  
Non-current   2,907  
Total 2,978 2,978 2,714
Other employee entitlements      
Disclosure of other provisions [Line Items]      
Opening balance 354    
Adjustment on currency translation (6)    
Adjustments to property, plant and equipment:      
– changes in estimate 0    
Charged/(credited) to profit:      
– increases to existing and new provisions 52    
– decreases to existing provisions and unused amounts reversed (6)    
– amortisation of discount 0    
Utilised in the period (26)    
Actuarial losses recognised in equity 0    
Transfers and other movements 0    
Closing balance 368    
Balance sheet analysis:      
Current   282  
Non-current   86  
Total 368 368 354
Close down and restoration/ environmental      
Disclosure of other provisions [Line Items]      
Opening balance 11,090    
Adjustment on currency translation (194)    
Adjustments to property, plant and equipment:      
– changes in estimate 72    
Charged/(credited) to profit:      
– increases to existing and new provisions 275    
– decreases to existing provisions and unused amounts reversed (94)    
– amortisation of discount 214    
Utilised in the period (155)    
Actuarial losses recognised in equity 0    
Transfers and other movements (2)    
Closing balance 11,206    
Balance sheet analysis:      
Current   612  
Non-current   10,594  
Total 11,090 11,206 11,090
Other      
Disclosure of other provisions [Line Items]      
Opening balance 945    
Adjustment on currency translation (17)    
Adjustments to property, plant and equipment:      
– changes in estimate 12    
Charged/(credited) to profit:      
– increases to existing and new provisions 80    
– decreases to existing provisions and unused amounts reversed (68)    
– amortisation of discount 2    
Utilised in the period (73)    
Actuarial losses recognised in equity 0    
Transfers and other movements (30)    
Closing balance 851    
Balance sheet analysis:      
Current   515  
Non-current   336  
Total $ 851 $ 851 $ 945