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Stock Based Awards and Other Equity Instruments - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Capitalized stock based compensation as internal-use software and website development costs $ 5,000,000 $ 3,000,000 $ 14,000,000 $ 10,000,000
Cash received from stock option exercises     2,000,000 3,000,000
Income tax benefits from exercise or settlement of stock-based awards $ 1,000,000 $ 1,000,000 $ 23,000,000 10,000,000
Stock Options        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of stock options issued     687,000  
RSU        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock units issued under incentive plan     2,904,000  
MSUs        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock units issued under incentive plan [1]     78,000  
MSUs | Employees        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Requisite service period for estimated grant-date fair value of stock awards     Dec. 31, 2021  
2018 Plan | Stock Options        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of stock options issued     687,000  
Term of stock options, granted     10 years  
Stock awards vest period     4 years  
Closing stock price $ 38.68   $ 38.68  
Total intrinsic value     $ 2,000,000 7,000,000
Total fair value of stock options vested     11,000,000 35,000,000
Cash received from stock option exercises     $ 2,000,000 $ 3,000,000
2018 Plan | RSU        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock awards vest period     4 years  
Stock units issued under incentive plan     2,904,000  
[1] MSUs provide for vesting based upon the Company’s total shareholder return, or TSR, performance over the period commencing January 1, 2019 through December 31, 2021 relative to the TSR performance of the Nasdaq Composite Total Return Index. Based upon actual attainment relative to the target performance metric, the grantee has the ability to receive up to 200% of the target number of MSUs originally granted, or to be issued none at all.