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Derivatives - Net Investment Hedges (Details) - Net Investment Hedges
€ in Millions, $ in Millions, ₩ in Billions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
EUR (€)
Jun. 30, 2019
KRW (₩)
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 (74) 322 33 188    
Ineffective Portion of Gain (Loss) on Instrument and Amount Excluded from Effectiveness Testing Recognized in Income   1   (2)    
Amount Excluded from Effectiveness Testing Recognized in Income 7   12      
Foreign currency forward contracts            
Net investment hedges            
Derivative notional amount         € 830 ₩ 248
Pretax Gain (Loss) Recognized as Cumulative Translation within Other Comprehensive Income on Effective Portion of Instrument (10) 23 5 17    
Foreign currency forward contracts | Cost of sales            
Net investment hedges            
Ineffective Portion of Gain (Loss) on Instrument and Amount Excluded from Effectiveness Testing Recognized in Income   1        
Amount Excluded from Effectiveness Testing Recognized in Income 7   12      
Foreign Currency Denominated Debt            
Net investment hedges            
Face amount of debt designated as a net investment hedge | €         € 4,100  
Pretax Gain (Loss) Recognized as Cumulative Translation within Other Comprehensive Income on Effective Portion of Instrument $ (64) $ 299 $ 28 171    
Ineffective Portion of Gain (Loss) on Instrument and Amount Excluded from Effectiveness Testing Recognized in Income       $ (2)