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Fair Value Measurements - Foreign Currency Forward Contracts (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Derivatives, Fair Value [Line Items]          
Net revenues $ 1,932 $ 1,396 $ 3,719 $ 3,220  
Carrying value of the investment 42   42   $ 42
Buy USD, Sell Euro | Designated as Hedging Instrument | Cash Flow Hedging          
Derivatives, Fair Value [Line Items]          
Notional amount 623   623   350
Fair value gain (loss) (1)   (1)   (2)
Foreign currency forward contracts | Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income          
Derivatives, Fair Value [Line Items]          
Net revenues 3 $ 6 $ 12 $ 17  
Foreign currency forward contracts | Designated as Hedging Instrument | Cash Flow Hedging          
Derivatives, Fair Value [Line Items]          
Contract maturity (or less)     17 months    
Buy USD, Sell GBP | Not Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Notional amount 25   $ 25   25
Fair value gain (loss) $ 0   $ 0   $ (2)