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Financial instruments - Financial instruments indexed to LIBOR (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Debt $ 265 $ 582
Term Loan | Financial instruments indexed to LIBOR    
Disclosure of detailed information about financial instruments [line items]    
Debt 200  
Interest rate swap contract | Financial instruments indexed to LIBOR    
Disclosure of detailed information about financial instruments [line items]    
Derivatives $ 2