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Derivatives and Hedging - Narrative (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Derivative [Line Items]            
Estimated pretax losses currently included within Accumulated Other Comprehensive Loss that will be reclassified to earnings in next twelve months     $ 11      
Financial instruments     $ (34) $ (49)   $ 2
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]            
Derivative term of contract (in days)     30 days      
Financial instruments     $ (18) (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 $ 112 € 101   250 € 220  
Unrealized gain recognized in AOCI     $ 29 $ 21