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Derivative instruments - Effect of Derivative Contracts Not Designated as Hedging Instruments on Income Statement (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments $ (5) $ 5 $ (11) $ 0
Gain (Loss) on Foreign Currency Fair Value Hedge Derivatives 0 10 0 (22)
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments $ 3 $ 0 $ 5 $ 0