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Fair Value Measurements - Foreign Currency Forward Contracts (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Derivatives, Fair Value [Line Items]      
Net revenues $ 1,825 $ 1,965  
Foreign currency forward contracts | Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income      
Derivatives, Fair Value [Line Items]      
Net revenues 11 $ (10)  
Foreign currency forward contracts | Designated as Hedging Instrument | Cash Flow Hedging      
Derivatives, Fair Value [Line Items]      
Notional amount 530   $ 723
Fair value gain (loss) $ 21   12
Contract maturity (or less) 9 months    
Net realized gains $ 4    
Deferred cash flow hedge gain (loss) in AOCI 4    
Buy USD, Sell SEK | Not Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Notional amount 396   0
Fair value gain (loss) (1)   0
Buy USD, Sell EUR | Not Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Notional amount 64   0
Fair value gain (loss) 1   0
Buy EUR, Sell USD | Not Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Notional amount 64   0
Fair value gain (loss) (1)   0
Buy USD, Sell GBP | Not Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Notional amount 43   55
Fair value gain (loss) $ (1)   $ 1