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Intangible assets - Summary of intangible assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period $ 3,119 $ 3,279  
Adjustment on currency translation (245) 216  
Expenditure during the year 174 122  
Amortisation for the year (133) (177) $ (227)
Impairment charges (2) (357)  
Disposals, transfers and other movements (134) 36  
Intangible assets at end of period 2,779 3,119 3,279
Cost [member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 7,857    
Intangible assets at end of period 7,215 7,857  
Accumulated amortisation and impairment [member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period (4,738)    
Intangible assets at end of period (4,436) (4,738)  
Exploration and evaluation [member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 393 711  
Adjustment on currency translation (25) 27  
Expenditure during the year 90 57  
Impairment charges   (357)  
Disposals, transfers and other movements (225) (45)  
Intangible assets at end of period 233 393 711
Exploration and evaluation [member] | Cost [member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 2,658    
Intangible assets at end of period 2,346 2,658  
Exploration and evaluation [member] | Accumulated amortisation and impairment [member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period (2,265)    
Intangible assets at end of period (2,113) (2,265)  
Trademarks, patented and non-patented technology [member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 75 78  
Adjustment on currency translation (3) 10  
Expenditure during the year 1    
Amortisation for the year (14) (13)  
Intangible assets at end of period 59 75 78
Trademarks, patented and non-patented technology [member] | Cost [member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 224    
Intangible assets at end of period 217 224  
Trademarks, patented and non-patented technology [member] | Accumulated amortisation and impairment [member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period (149)    
Intangible assets at end of period (158) (149)  
Contract based intangible assets [member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 2,188 2,103  
Adjustment on currency translation (171) 150  
Amortisation for the year (23) (67)  
Disposals, transfers and other movements (12) 2  
Intangible assets at end of period 1,982 2,188 2,103
Contract based intangible assets [member] | Cost [member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 3,438    
Intangible assets at end of period 3,114 3,438  
Contract based intangible assets [member] | Accumulated amortisation and impairment [member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period (1,250)    
Intangible assets at end of period (1,132) (1,250)  
Other intangible assets [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 463 387  
Adjustment on currency translation (46) 29  
Expenditure during the year 83 65  
Amortisation for the year (96) (97)  
Impairment charges (2)    
Disposals, transfers and other movements 103 79  
Intangible assets at end of period 505 463 $ 387
Other intangible assets [Member] | Cost [member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period 1,537    
Intangible assets at end of period 1,538 1,537  
Other intangible assets [Member] | Accumulated amortisation and impairment [member]      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets at beginning of period (1,074)    
Intangible assets at end of period $ (1,033) $ (1,074)