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General information (Details)
 12 Months Ended
Dec. 31, 2021
Subsidiaries
CrudeCarrier
t
Disclosure of subsidiaries [abstract]  
Number of wholly owned subsidiaries 32
Number of large crude carriers | CrudeCarrier 26
Total carrying capacity | t 8,043,657
Top of Range [Member]  
Disclosure of subsidiaries [abstract]  
Weight of tankers | t 320,000
Bottom of Range [Member]  
Disclosure of subsidiaries [abstract]  
Weight of tankers | t 200,000
Marshall Island [Member]  
Disclosure of subsidiaries [abstract]  
Number of wholly owned subsidiaries 20
Number of vessel-owning subsidiaries 20
Cayman Islands [Member]  
Disclosure of subsidiaries [abstract]  
Number of wholly owned subsidiaries 7
Number of vessel-owning subsidiaries 7
Singapore [Member]  
Disclosure of subsidiaries [abstract]  
Number of wholly owned subsidiaries 3
Monegasque [Member]  
Disclosure of subsidiaries [abstract]  
Number of wholly owned subsidiaries 1
Norwegian [Member]  
Disclosure of subsidiaries [abstract]  
Number of wholly owned subsidiaries 1