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Fair Value Measurements - Foreign Currency Forward Contracts (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Derivatives, Fair Value [Line Items]          
Net revenues $ 1,396 $ 1,641 $ 3,220 $ 3,607  
Foreign currency forward contracts | Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income          
Derivatives, Fair Value [Line Items]          
Net revenues 6 $ (4) 17 $ (14)  
Foreign currency forward contracts | Designated as Hedging Instrument | Cash Flow Hedging          
Derivatives, Fair Value [Line Items]          
Notional amount 409   409   $ 723
Fair value gain (loss) 11   $ 11   12
Contract maturity (or less)     6 months    
Net realized gains     $ 2    
Deferred cash flow hedge gain (loss) in AOCI 2   2    
Buy USD, Sell SEK | Not Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Notional amount 393   393   0
Fair value gain (loss) (4)   (4)   0
Buy USD, Sell EUR | Not Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Notional amount 142   142   0
Fair value gain (loss) 3   3   0
Buy EUR, Sell USD | Not Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Notional amount 142   142   0
Fair value gain (loss) 1   1   0
Buy USD, Sell GBP | Not Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Notional amount 28   28   55
Fair value gain (loss) 1   1   1
Buy GBP, Sell USD | Not Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Notional amount 28   28   0
Fair value gain (loss) $ 0   $ 0   $ 0