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Derivatives and Hedging - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Derivative [Line Items]            
Estimated pretax losses currently included within Accumulated Other Comprehensive Loss that will be reclassified to earnings in next twelve months     $ 7      
Gain (loss) on derivative     $ (11)   $ (34) $ (49)
Gross foreign exchange contracts | Not accounted for as hedges            
Derivative [Line Items]            
Derivative term of contract     90 days 90 days    
Gain (loss) on derivative     $ 1   (18) $ 27
Gross foreign exchange contracts | Not accounted for as hedges | Maximum            
Derivative [Line Items]            
Derivative term of contract     1 year 1 year    
Cash Flow Hedging            
Derivative [Line Items]            
Foreign currency exposures, maximum average hedging period (in years)     2 years 2 years    
Net Investment Hedging            
Derivative [Line Items]            
Outstanding Euro-denominated commercial paper $ 112 € 101,000,000   € 0    
Unrealized gain recognized in AOCI     $ 29   $ 29