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Intangible assets - Summary of intangible assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period $ 2,779 $ 3,119  
Adjustment on currency translation 71 (245)  
Expenditure during the year 91 174  
Amortisation for the year (133) (133) $ (177)
Impairment charges (1) (2)  
Disposals, transfers and other movements (170) (134)  
Intangible assets at end of period 2,637 2,779 3,119
Cost [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 7,215    
Intangible assets at end of period 7,038 7,215  
Accumulated amortisation and impairment [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period (4,436)    
Intangible assets at end of period (4,401) (4,436)  
Exploration and evaluation      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 233 393  
Adjustment on currency translation (1) (25)  
Expenditure during the year 57 90  
Amortisation for the year 0 0  
Impairment charges 0 0  
Disposals, transfers and other movements (116) (225)  
Intangible assets at end of period 173 233 393
Exploration and evaluation | Cost [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 2,346    
Intangible assets at end of period 2,306 2,346  
Exploration and evaluation | Accumulated amortisation and impairment [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period (2,113)    
Intangible assets at end of period (2,133) (2,113)  
Trademarks, patented and non-patented technology      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 59 75  
Adjustment on currency translation (1) (3)  
Expenditure during the year 0 1  
Amortisation for the year (14) (14)  
Impairment charges 0 0  
Disposals, transfers and other movements 0 0  
Intangible assets at end of period 44 59 75
Trademarks, patented and non-patented technology | Cost [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 217    
Intangible assets at end of period 214 217  
Trademarks, patented and non-patented technology | Accumulated amortisation and impairment [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period (158)    
Intangible assets at end of period (170) (158)  
Contract based intangible assets      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 1,982 2,188  
Adjustment on currency translation 74 (171)  
Expenditure during the year 0 0  
Amortisation for the year (8) (23)  
Impairment charges 0 0  
Disposals, transfers and other movements (101) (12)  
Intangible assets at end of period 1,947 1,982 2,188
Contract based intangible assets | Cost [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 3,114    
Intangible assets at end of period 3,002 3,114  
Contract based intangible assets | Accumulated amortisation and impairment [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period (1,132)    
Intangible assets at end of period (1,055) (1,132)  
Other intangible assets      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 505 463  
Adjustment on currency translation (1) (46)  
Expenditure during the year 34 83  
Amortisation for the year (111) (96)  
Impairment charges (1) (2)  
Disposals, transfers and other movements 47 103  
Intangible assets at end of period 473 505 $ 463
Other intangible assets | Cost [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 1,538    
Intangible assets at end of period 1,516 1,538  
Other intangible assets | Accumulated amortisation and impairment [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period (1,033)    
Intangible assets at end of period $ (1,043) $ (1,033)