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Material accounting policies - Reporting Entity (Details)
 12 Months Ended
Nov. 22, 2023
Dec. 31, 2023
company
storage_unit
Oct. 09, 2023
shareholder
vessel
Disclosure of detailed information about property, plant and equipment [line items]      
Number of companies entity grew out of | company   3  
Proportion of ownership interest in subsidiary   100.00%  
CMB | Euronav NV      
Disclosure of detailed information about property, plant and equipment [line items]      
Percentage of ownership interest acquired     0.2612
Proportion of ownership interest in subsidiary 49.05% 49.05%  
CMB | CMB.TECH NV      
Disclosure of detailed information about property, plant and equipment [line items]      
Proportion of ownership interest in subsidiary   100.00%  
24 VLCC tankers      
Disclosure of detailed information about property, plant and equipment [line items]      
Number of shareholders involved in transaction | shareholder     2
Number of vessels sold | vessel     24
FSOs | North Oil Company      
Disclosure of detailed information about property, plant and equipment [line items]      
Number of floating storage units under service contracts | storage_unit   2