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Derivative Financial Instruments - Summary of Effect of Foreign Currency Exchange Contracts (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Gains (losses) recognized in AOCI $ (6) $ (78) $ 52 $ (289)
Gains (losses) reclassified from AOCI into product sales (8) (26) (101) 4
Gains recognized in Other income (expense), net 0 10 0 32
Gains (losses) recognized in Other income (expense), net $ 15 $ (2) $ 11 $ (112)