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Financial assets and liabilities - Derivative financial instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Commodity forward contracts        
Disclosure of detailed information about financial instruments [line items]        
Cash gain (loss) on hedging recognized $ 1 $ 20 $ (11) $ 30