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Fair Value Measurements - Recurring Basis (Details) - Recurring - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value $ 5,689 $ 5,422  
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 5,682 5,422  
Significant Other Observable Inputs (Level 2)      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 7 0  
Significant Unobservable Inputs (Level 3)      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 0 0  
Cash and cash equivalents | Money market funds      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 5,576 5,320  
Cash and cash equivalents | Foreign government treasury bills      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 32 37  
Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 5,576 5,320  
Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign government treasury bills      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 32 37  
Cash and cash equivalents | Significant Other Observable Inputs (Level 2) | Money market funds      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 0 0  
Cash and cash equivalents | Significant Other Observable Inputs (Level 2) | Foreign government treasury bills      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 0 0  
Cash and cash equivalents | Significant Unobservable Inputs (Level 3) | Money market funds      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 0 0  
Cash and cash equivalents | Significant Unobservable Inputs (Level 3) | Foreign government treasury bills      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 0 0  
Other current assets | U.S. treasuries and government agency securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 74 65  
Other current assets | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. treasuries and government agency securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 74 65  
Other current assets | Significant Other Observable Inputs (Level 2) | U.S. treasuries and government agency securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 0 0  
Other current assets | Significant Unobservable Inputs (Level 3) | U.S. treasuries and government agency securities      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 0 0  
Other current assets and Other assets | Foreign currency forward contracts | Designated as Hedging Instrument      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 7    
Other current assets and Other assets | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign currency forward contracts | Designated as Hedging Instrument      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 0    
Other current assets and Other assets | Significant Other Observable Inputs (Level 2) | Foreign currency forward contracts | Designated as Hedging Instrument      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value 7    
Other current assets and Other assets | Significant Unobservable Inputs (Level 3) | Foreign currency forward contracts | Designated as Hedging Instrument      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total assets at fair value $ 0    
Accrued expenses and other liabilities | Foreign currency forward contracts | Designated as Hedging Instrument      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total liabilities at fair value   (2) $ (1)
Accrued expenses and other liabilities | Foreign currency forward contracts | Not Designated as Hedging Instrument      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total liabilities at fair value   (2)  
Accrued expenses and other liabilities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign currency forward contracts | Designated as Hedging Instrument      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total liabilities at fair value   0 0
Accrued expenses and other liabilities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign currency forward contracts | Not Designated as Hedging Instrument      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total liabilities at fair value   0  
Accrued expenses and other liabilities | Significant Other Observable Inputs (Level 2) | Foreign currency forward contracts | Designated as Hedging Instrument      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total liabilities at fair value   (2) (1)
Accrued expenses and other liabilities | Significant Other Observable Inputs (Level 2) | Foreign currency forward contracts | Not Designated as Hedging Instrument      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total liabilities at fair value   (2)  
Accrued expenses and other liabilities | Significant Unobservable Inputs (Level 3) | Foreign currency forward contracts | Designated as Hedging Instrument      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total liabilities at fair value   0 $ 0
Accrued expenses and other liabilities | Significant Unobservable Inputs (Level 3) | Foreign currency forward contracts | Not Designated as Hedging Instrument      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Total liabilities at fair value   $ 0