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Fair Value Measurements - Foreign Currency Forward Contracts (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]                      
Net revenues $ 2,381 $ 1,512 $ 1,641 $ 1,965 $ 2,043 $ 1,618 $ 1,631 $ 1,726 $ 7,500 $ 7,017 $ 6,608
Foreign currency forward contracts | Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income                      
Derivatives, Fair Value [Line Items]                      
Net revenues                 7 (1) $ 4
Foreign currency forward contracts | Designated as Hedges | Cash Flow Hedging                      
Derivatives, Fair Value [Line Items]                      
Notional amount of foreign currency derivatives 723       521       723 521  
Fair value of foreign currency forward contracts 12       (5)       $ 12 (5)  
Maximum length of time over which our foreign currency forward contracts mature                 12 months    
Deferred cash flow hedge gain (loss) to be reclassified within twelve months                 $ 11    
Deferred cash flow hedge gain (loss) in AOCI 11               11    
Foreign currency forward contracts | Not Designated as Hedging Instrument                      
Derivatives, Fair Value [Line Items]                      
Notional amount of foreign currency derivatives 55       0       55 0  
Fair value of foreign currency forward contracts $ 1       $ 0       $ 1 $ 0