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Provisions, commitments, contingent items and related parties - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Norwegian state [member]    
Disclosure of other provisions [table]    
Amounts receivable, related party transactions $ 1,206 $ 435
Asset retirement obligations [member]    
Disclosure of other provisions [table]    
Reduction in exposure due to settlement 4,432  
Other provisions 12,985  
Deviation notices and disputes with Norwegian tax authorities [member]    
Disclosure of other provisions [table]    
Estimated financial effect of contingent assets 182  
Dispute regarding the level of Research & Development cost [member]    
Disclosure of other provisions [table]    
Estimated exposure $ 149