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Derivatives and Hedging - Narrative (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Derivative [Line Items]          
Estimated pretax losses currently included within Accumulated Other Comprehensive Loss that will be reclassified to earnings in next twelve months     $ 13    
Gain (loss) recognized in income on ineffective portion of derivatives     0 $ 0 $ 0
Financial instruments     $ (49) 2 $ (14)
Not accounted for as hedges          
Derivative [Line Items]          
Maximum length of time hedged in foreign currency undesignated hedge (in years)     1 year    
Gross foreign exchange contracts | Not accounted for as hedges          
Derivative [Line Items]          
Financial instruments     $ 27 $ 7  
Cash Flow Hedging          
Derivative [Line Items]          
Foreign currency exposures, maximum average hedging period ( in years)     2 years    
Net Investment Hedging          
Derivative [Line Items]          
Outstanding Euro-denominated commercial paper $ 250 € 220      
Unrealized gain recognized in AOCI     $ 21