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Cash and cash equivalents - Summary of Restricted Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of Restricted Cash And Cash Equivalents [Line Items]    
Cash and cash equivalents with restrictions on use $ 27 $ 22
Countries with restrictions on repatriation    
Disclosure of Restricted Cash And Cash Equivalents [Line Items]    
Cash and cash equivalents with restrictions on use 4 2
Capital expenditure under lease agreements    
Disclosure of Restricted Cash And Cash Equivalents [Line Items]    
Cash and cash equivalents with restrictions on use 17 15
Other restrictions    
Disclosure of Restricted Cash And Cash Equivalents [Line Items]    
Cash and cash equivalents with restrictions on use $ 6 $ 5