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Other commitments, contingent liabilities and contingent assets (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Wells
Dec. 31, 2011
Dec. 31, 2019
USD ($)
Disclosure of other provisions and other liabilities [line items]      
Contractual commitments $ 5,849,000    
Trade, other payables and provisions $ 10,510,000   $ 10,450,000
Wells committed to drill [member]      
Disclosure of other provisions and other liabilities [line items]      
Number of wells, committed to drill | Wells 26    
Average ownership interest in wells committed to drill 37.00%    
Provisions, net of tax $ 323,000    
Various long term agreements [Member] | Maximum [member]      
Disclosure of other provisions and other liabilities [line items]      
Contract Term 2044    
Leases Agreements [Member]      
Disclosure of other provisions and other liabilities [line items]      
Provisions, net of tax $ 2,222,000    
Agbami redetermination [member]      
Disclosure of other provisions and other liabilities [line items]      
Trade, other payables and provisions 872,000    
Guarantees [member]      
Disclosure of other provisions and other liabilities [line items]      
Estimated exposure 316,000    
Mineral rights dispute along the Missouri riverbank [member] | Maximum [member]      
Disclosure of other provisions and other liabilities [line items]      
Estimated exposure 91,000    
Claim from Petrofac [member]      
Disclosure of other provisions and other liabilities [line items]      
Estimated exposure $ 163,000    
Percentage Share of Contingent Liability 31.85%    
Claim from Petrofac [member] | Petrofac International (UAE) LLC [Member]      
Disclosure of other provisions and other liabilities [line items]      
Estimated exposure $ 533,000    
Dispute with Brazilian tax authorities [member]      
Disclosure of other provisions and other liabilities [line items]      
Estimated exposure 111,000    
Dispute with Brazilian tax authorities [member] | Portion of Peregrino field, divestiture [Member]      
Disclosure of other provisions and other liabilities [line items]      
Proportion of ownership interest divested   40.00%  
ICMS indirect tax [member]      
Disclosure of other provisions and other liabilities [line items]      
Estimated exposure $ 647,000    
Indirect tax rate 18.00%    
KKD oil sands partnership [Member]      
Disclosure of other provisions and other liabilities [line items]      
Provisions, net of tax $ 0    
Proportion of ownership interest divested 40.00%    
KKD oil sands partnership [Member] | Maximum [member]      
Disclosure of other provisions and other liabilities [line items]      
Estimated exposure $ 396,000    
Capital structure of the subsidiary [Member]      
Disclosure of other provisions and other liabilities [line items]      
Estimated exposure 188,000    
Research & Development cost [Member]      
Disclosure of other provisions and other liabilities [line items]      
Estimated exposure 220,000    
Internal pricing of certain products of natural gas liquids [Member]      
Disclosure of other provisions and other liabilities [line items]      
Estimated exposure 100,000    
Price review arbitration [member]      
Disclosure of other provisions and other liabilities [line items]      
Reduction in exposure (1,300,000)    
Price review related income before tax 150,000    
Price review related income after tax $ 30,000