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Fair Value Measurements - Foreign Currency Forward Contracts (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Derivatives, Fair Value [Line Items]          
Net revenues $ 1,282 $ 1,512 $ 4,503 $ 5,119  
Foreign currency forward contracts | Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income          
Derivatives, Fair Value [Line Items]          
Net revenues 7 $ 3 24 $ (11)  
Foreign currency forward contracts | Designated as Hedging Instrument | Cash Flow Hedging          
Derivatives, Fair Value [Line Items]          
Notional amount 310   310   $ 723
Fair value gain (loss) 23   $ 23   12
Contract maturity (or less)     3 months    
Net realized gains     $ 2    
Deferred cash flow hedge gain (loss) in AOCI 2   2    
Buy USD, Sell EUR | Not Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Notional amount 81   81   0
Fair value gain (loss) 5   5   0
Buy EUR, Sell USD | Not Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Notional amount 79   79   0
Fair value gain (loss) (3)   (3)   0
Buy USD, Sell SEK | Not Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Notional amount 46   46   0
Fair value gain (loss) 2   2   0
Buy SEK, Sell USD | Not Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Notional amount 45   45   0
Fair value gain (loss) (1)   (1)   0
Buy USD, Sell GBP | Not Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Notional amount 13   13   55
Fair value gain (loss) 1   1   1
Buy GBP, Sell USD | Not Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Notional amount 13   13   0
Fair value gain (loss) $ 0   $ 0   $ 0