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Derivative Financial Instruments - Summary of Effect of Foreign Currency Exchange Contracts (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gains (losses) recognized in AOCI $ 28 $ (61)
Gains (losses) reclassified from AOCI into product sales 29 (48)
Gains (losses) recognized in Other income (expense), net $ (6) $ (14)