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Derivative Financial Instruments - Summary of Effect of Foreign Currency Exchange Contracts (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gains recognized in AOCI $ 66 $ 28
Gains reclassified from AOCI into product sales 27 29
Gains (losses) recognized in Other income (expense), net $ 24 $ (6)