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Derivatives - Net Investment Hedges (Details) - Net Investment Hedges
€ in Millions, ₩ in Billions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
KRW (₩)
Sep. 30, 2017
EUR (€)
Net investment hedges            
Effective portion of net investment hedge reclassified out of other comprehensive income into income $ 0 $ 0 $ 0 $ 0    
Pretax Gain (Loss) Recognized as Cumulative Translation within Other Comprehensive Income on Effective Portion of Instrument (188,000,000) (69,000,000) (606,000,000) (146,000,000)    
Ineffective portion of gain (loss) on derivative and amount excluded from effectiveness testing recognized in income 1,000,000   6,000,000 1,000,000    
Foreign currency forward contracts            
Net investment hedges            
Derivative notional amount         ₩ 248 € 250
Pretax Gain (Loss) Recognized as Cumulative Translation within Other Comprehensive Income on Effective Portion of Instrument (9,000,000) (14,000,000) (36,000,000) (41,000,000)    
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 1,000,000   6,000,000 1,000,000    
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 $ (179,000,000) $ (55,000,000) $ (570,000,000) $ (105,000,000)