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Derivative Financial Instruments - Summary of Effect of Foreign Currency Exchange Contracts (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Losses recognized in AOCI $ (61) $ (94)
Gains (losses) reclassified from AOCI into product sales (48) 43
Gains recognized in Other income (expense), net 0 13
Losses recognized in Other income (expense), net $ (14) $ (135)