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Other commitments, contingent liabilities and contingent assets (Details)
 1 Months Ended 12 Months Ended
Jan. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Wells
Jun. 30, 2019
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Feb. 28, 2018
USD ($)
Disclosure of other provisions and other liabilities [line items]            
Contractual commitments   $ 5,205,000,000        
Trade, other payables and provisions   10,450,000,000   $ 8,335,000,000 $ 8,369,000,000  
Wells committed to drill [member]            
Disclosure of other provisions and other liabilities [line items]            
Contractual commitments   $ 663,000,000        
Number of wells, committed to drill | Wells   38        
Average ownership interest in wells committed to drill   44.00%        
Various long term agreements [Member]            
Disclosure of other provisions and other liabilities [line items]            
Provisions, net of tax   $ 3,009,000,000        
Various long term agreements [Member] | Maximum [member]            
Disclosure of other provisions and other liabilities [line items]            
Contract Term   2044        
Long-term charter agreement with Teekay [Member]            
Disclosure of other provisions and other liabilities [line items]            
Provisions, net of tax   $ 300,000,000        
Agbami redetermination [member]            
Disclosure of other provisions and other liabilities [line items]            
Trade, other payables and provisions   853,000,000        
Guarantees [member]            
Disclosure of other provisions and other liabilities [line items]            
Estimated exposure   1,200,000,000        
Gas price review clauses [member]            
Disclosure of other provisions and other liabilities [line items]            
Estimated exposure     $ 1,300,000,000      
Tax contingent liability [member]            
Disclosure of other provisions and other liabilities [line items]            
Estimated exposure   180,000,000       $ 500,000,000
Provisions, net of tax   0        
Federal Government of Nigeria disputes [Member]            
Disclosure of other provisions and other liabilities [line items]            
Provisions, net of tax   0        
Contract for the drilling rig COSL Innovator [Member]            
Disclosure of other provisions and other liabilities [line items]            
Effect of dispute resolution recongised in income $ 57,500,000          
Dispute with Brazilian tax authorities [Member] | Portion of Peregrino field, divestiture [Member]            
Disclosure of other provisions and other liabilities [line items]            
Estimated exposure   $ 0        
Proportion of ownership interest divested   40.00%        
ICMS indirect tax [Member]            
Disclosure of other provisions and other liabilities [line items]            
Estimated exposure   $ 700,000,000        
Indirect tax rate   20.00%