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Derivatives - Net Investment Hedges (Details) - Net Investment Hedges
€ in Millions, $ in Millions, ₩ in Billions
3 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2016
KRW (₩)
Mar. 31, 2016
EUR (€)
Net investment hedges        
Effective portion of net investment hedge reclassified out of other comprehensive income into income $ 0      
Pretax Gain (Loss) Recognized as Cumulative Translation within Other Comprehensive Income on Effective Portion of Instrument (187) $ 397    
Ineffective portion of gain (loss) on derivative and amount excluded from effectiveness testing recognized in income (2)      
Foreign currency forward contracts        
Net investment hedges        
Derivative notional amount     ₩ 248 € 974
Pretax Gain (Loss) Recognized as Cumulative Translation within Other Comprehensive Income on Effective Portion of Instrument (43) 157    
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)      
Foreign Currency Denominated Debt        
Net investment hedges        
Face amount of debt designated as a net investment hedge | €       € 3,600
Pretax Gain (Loss) Recognized as Cumulative Translation within Other Comprehensive Income on Effective Portion of Instrument $ (144) $ 240