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Derivatives - Net Investment Hedges (Details) - Net Investment Hedges
€ in Millions, $ in Millions, ₩ in Billions
3 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2017
KRW (₩)
Mar. 31, 2017
EUR (€)
Net investment hedges        
Effective portion of net investment hedge reclassified out of other comprehensive income into income $ 0 $ 0    
Pretax Gain (Loss) Recognized as Cumulative Translation within Other Comprehensive Income on Effective Portion of Instrument (141) (187)    
Ineffective portion of gain (loss) on derivative and amount excluded from effectiveness testing recognized in income 2 (2)    
Foreign currency forward contracts        
Net investment hedges        
Derivative notional amount     ₩ 248 € 150
Pretax Gain (Loss) Recognized as Cumulative Translation within Other Comprehensive Income on Effective Portion of Instrument (20) (43)    
Foreign currency forward contracts | Cost of sales        
Net investment hedges        
Ineffective portion of gain (loss) on derivative and amount excluded from effectiveness testing recognized in income 2 (2)    
Foreign Currency Denominated Debt        
Net investment hedges        
Face amount of debt designated as a net investment hedge | €       € 4,400
Pretax Gain (Loss) Recognized as Cumulative Translation within Other Comprehensive Income on Effective Portion of Instrument $ (121) $ (144)