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Intangible assets - Summary of intangible assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period $ 2,637 $ 2,779  
Adjustment on currency translation 111 71  
Expenditure during the year 156 91  
Amortisation for the year (161) (133) $ (133)
Impairment charges (4) (1)  
Disposals, transfers and other movements 16 (170)  
Intangible assets at end of period 2,755 2,637 2,779
Cost      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 7,038    
Intangible assets at end of period 7,427 7,038  
Accumulated amortisation and impairment      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period (4,401)    
Intangible assets at end of period (4,672) (4,401)  
Exploration and evaluation      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 173 233  
Adjustment on currency translation 17 (1)  
Expenditure during the year 87 57  
Amortisation for the year 0 0  
Impairment charges 0 0  
Disposals, transfers and other movements (6) (116)  
Intangible assets at end of period 271 173 233
Exploration and evaluation | Cost      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 2,306    
Intangible assets at end of period 2,415 2,306  
Exploration and evaluation | Accumulated amortisation and impairment      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period (2,133)    
Intangible assets at end of period (2,144) (2,133)  
Trademarks, patented and non-patented technology      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 44 59  
Adjustment on currency translation 3 (1)  
Expenditure during the year 0 0  
Amortisation for the year (14) (14)  
Impairment charges 0 0  
Disposals, transfers and other movements 0 0  
Intangible assets at end of period 33 44 59
Trademarks, patented and non-patented technology | Cost      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 214    
Intangible assets at end of period 232 214  
Trademarks, patented and non-patented technology | Accumulated amortisation and impairment      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period (170)    
Intangible assets at end of period (199) (170)  
Contract based intangible assets      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 1,947 1,982  
Adjustment on currency translation 56 74  
Expenditure during the year 0 0  
Amortisation for the year (8) (8)  
Impairment charges 0 0  
Disposals, transfers and other movements (1) (101)  
Intangible assets at end of period 1,994 1,947 1,982
Contract based intangible assets | Cost      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 3,002    
Intangible assets at end of period 3,070 3,002  
Contract based intangible assets | Accumulated amortisation and impairment      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period (1,055)    
Intangible assets at end of period (1,076) (1,055)  
Other intangible assets      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 473 505  
Adjustment on currency translation 35 (1)  
Expenditure during the year 69 34  
Amortisation for the year (139) (111)  
Impairment charges (4) (1)  
Disposals, transfers and other movements 23 47  
Intangible assets at end of period 457 473 $ 505
Other intangible assets | Cost      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 1,516    
Intangible assets at end of period 1,710 1,516  
Other intangible assets | Accumulated amortisation and impairment      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period (1,043)    
Intangible assets at end of period $ (1,253) $ (1,043)