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Other commitments, contingent liabilities and contingent assets (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Wells
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure of other provisions and other liabilities [line items]        
Contractual commitments   $ 7,038    
Trade, other payables and provisions   14,310 $ 10,510 $ 10,450
Wells committed to drill [member]        
Disclosure of other provisions and other liabilities [line items]        
Contractual commitments   $ 409    
Number of wells, committed to drill | Wells   36    
Average ownership interest in wells committed to drill   46.00%    
Various long term agreements [Member] | Maximum [member]        
Disclosure of other provisions and other liabilities [line items]        
Contract Term   2060    
Leases Agreements [Member]        
Disclosure of other provisions and other liabilities [line items]        
Provisions, net of tax   $ 2,022    
Agbami redetermination [member]        
Disclosure of other provisions and other liabilities [line items]        
Reduction in exposure $ 822      
Other Revenue $ 57      
Guarantees [member]        
Disclosure of other provisions and other liabilities [line items]        
Estimated exposure   439    
Claim from Petrofac [member]        
Disclosure of other provisions and other liabilities [line items]        
Estimated exposure   $ 163    
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    
Dispute with Brazilian tax authorities [member] | Maximum [member]        
Disclosure of other provisions and other liabilities [line items]        
Estimated exposure   135    
ICMS indirect tax [member]        
Disclosure of other provisions and other liabilities [line items]        
Estimated exposure   $ 460    
Indirect tax rate   18.00%    
KKD oil sands partnership [Member]        
Disclosure of other provisions and other liabilities [line items]        
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   $ 397    
Norwegian tax authorities [member] | Maximum [member]        
Disclosure of other provisions and other liabilities [line items]        
Estimated exposure   182    
Research & Development cost [Member] | Maximum [member]        
Disclosure of other provisions and other liabilities [line items]        
Estimated exposure   206    
Internal pricing of certain products of natural gas liquids [Member] | Maximum [member]        
Disclosure of other provisions and other liabilities [line items]        
Estimated exposure   $ 100    
New Brazilian law [Member]        
Disclosure of other provisions and other liabilities [line items]        
Percent of savings from ICMS tax incentives   10.00%    
New Brazilian law [Member] | Maximum [member]        
Disclosure of other provisions and other liabilities [line items]        
Estimated exposure   $ 112