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Financial assets and liabilities - Net Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financial assets and liabilities        
Net borrowings $ 3,902 $ 3,734    
Cash, cash equivalents and restricted cash (610) (443) $ (555) $ (463)
Derivative financial instruments used to hedge foreign currency and interest rate risk 13 21    
Net debt 3,305 3,312 $ 3,037  
Non-current borrowings 3,797 3,640    
Current borrowings $ 105 $ 94