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Stockholders' Equity - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jan. 01, 2019
Jun. 30, 2019
Jun. 30, 2019
Apr. 01, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized amount for stock repurchases       $ 1,000,000,000.0
Remaining authorized repurchase amount   $ 900,000,000.0 $ 900,000,000.0  
2014 Employee Stock Purchase Plan | ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of additional shares authorized for issuance (in shares) 756,679      
Percent of shares outstanding to increase number of shares available for grant and issuance 1.00%      
Maximum increase of number of shares available for issuance (in shares) 2,500,000      
Shares issued during period (in shares)   45,743    
Common stock reserved for issuance (in shares)   3,244,374 3,244,374  
Weighted-average grant-date fair value of options granted (in dollars per share)     $ 190.31