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Material accounting policies - Reporting Entity (Details)
 12 Months Ended
Feb. 07, 2024
Nov. 22, 2023
Dec. 31, 2024
company
vessel
Dec. 31, 2023
Oct. 09, 2023
vessel
shareholder
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%    
Number of vessels owned and operated     160    
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%      
CMB | CMB.TECH NV          
Disclosure of detailed information about property, plant and equipment [line items]          
Proportion of ownership interest in subsidiary 100.00%     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         24