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Cash, cash equivalents and restricted cash (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash, cash equivalents and restricted cash        
Cash at bank and in hand $ 214 $ 324    
Short term bank deposits 388 110    
Restricted cash 8 9    
Total $ 610 $ 443 $ 555 $ 463