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Derivative Financial Instruments - Summary of Effect of Foreign Currency Exchange Contracts (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Gains (losses) recognized in AOCI $ (42) $ 1 $ 24 $ 29
Gains (losses) reclassified from AOCI into product sales 18 36 45 65
Gains (losses) recognized in Other income (expense), net $ (21) $ (5) $ 3 $ (11)