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Intangible assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangibles beginning $ 9,672    
Expensed exploration expenditures previously capitalised (777) $ (357) $ 8
Intangibles ending $ 10,738 9,672  
Minimum [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets with finite useful lives 10 years    
Maximum [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets with finite useful lives 20 years    
Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangibles beginning $ 9,901 8,836  
Additions through business combinations 1,080 773  
Additions 1,571 1,302  
Disposals at cost (367) (364)  
Increase (decrease) through transfers, intangible assets and goodwill (213) (161)  
Assets reclassified to held for sale 0 0  
Expensed exploration expenditures previously capitalised (777) (357)  
Impairment of goodwill (164)    
Effect of changes in foreign exchange 3 (128)  
Intangibles ending 11,033 9,901 8,836
Accumulated depreciation, amortisation and impairment [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangibles beginning (229) (215)  
Amortisation and impairments for the year (60) (13)  
Amortisation and impairment losses disposed intangible assets (6) (2)  
Effect of changes in foreign exchange 1 1  
Intangibles ending (295) (229) (215)
Exploration expenses [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangibles beginning 2,685    
Intangibles ending 3,014 2,685  
Impairments, intangible assets 49 52  
Exploration expenses [Member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangibles beginning 2,685 2,715  
Additions through business combinations 0 0  
Additions 515 392  
Disposals at cost (7) (272)  
Increase (decrease) through transfers, intangible assets and goodwill (71) (13)  
Assets reclassified to held for sale 0 0  
Expensed exploration expenditures previously capitalised (120) (68)  
Impairment of goodwill 0    
Effect of changes in foreign exchange 11 (70)  
Intangibles ending 3,014 2,685 2,715
Acquisition costs related to oil and gas prospects [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangibles beginning 5,854    
Intangibles ending 5,599 5,854  
Acquisition costs related to oil and gas prospects [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangibles beginning 5,854 5,363  
Additions through business combinations 0 116  
Additions 900 917  
Disposals at cost (361) (89)  
Increase (decrease) through transfers, intangible assets and goodwill (143) (148)  
Assets reclassified to held for sale 0 0  
Expensed exploration expenditures previously capitalised (657) (289)  
Impairment of goodwill 0    
Effect of changes in foreign exchange 5 (17)  
Intangibles ending 5,599 5,854 5,363
Goodwill [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangibles beginning 565    
Intangibles ending 1,458 565  
Goodwill [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangibles beginning 565 339  
Additions through business combinations 1,070 265  
Additions 0 0  
Disposals at cost 0 0  
Increase (decrease) through transfers, intangible assets and goodwill 0 0  
Assets reclassified to held for sale 0 0  
Expensed exploration expenditures previously capitalised 0 0  
Impairment of goodwill (164)    
Effect of changes in foreign exchange (12) (39)  
Intangibles ending 1,458 565 339
Goodwill [member] | Accumulated depreciation, amortisation and impairment [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangibles beginning 0 0  
Amortisation and impairments for the year 0 0  
Amortisation and impairment losses disposed intangible assets 0 0  
Effect of changes in foreign exchange 0 0  
Intangibles ending 0 0 0
Other intangible assets [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangibles beginning 568    
Intangibles ending 667 568  
Impairments, intangible assets 41    
Other intangible assets [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangibles beginning 797 419  
Additions through business combinations 10 392  
Additions 155 (7)  
Disposals at cost 0 (4)  
Increase (decrease) through transfers, intangible assets and goodwill 0 0  
Assets reclassified to held for sale 0 0  
Expensed exploration expenditures previously capitalised 0 0  
Impairment of goodwill 0    
Effect of changes in foreign exchange (1) (2)  
Intangibles ending 962 797 419
Other intangible assets [member] | Accumulated depreciation, amortisation and impairment [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangibles beginning (229) (215)  
Amortisation and impairments for the year (60) (13)  
Amortisation and impairment losses disposed intangible assets (6) (2)  
Effect of changes in foreign exchange 1 1  
Intangibles ending (295) (229) $ (215)
Signature bonuses and acquisition costs [Member] | North America [member] | Unconventional assets [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Impairments, intangible assets $ 608 $ 237