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Stock Based Awards and Other Equity Instruments - Additional Information (Details) - USD ($) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 05, 2017 | Jun. 28, 2013 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 21, 2018 | Dec. 20, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Capitalized stock based compensation as internal-use software and website development costs |  |  | $ 19,000,000 | $ 13,000,000 | $ 13,000,000 |  |
Common shares registered for issuance under incentive plan |  |  |  |  |  |  | 17,500,000
Common stock share issuance under plan |  | 15,000,000 |  |  |  |  |
Cash received from stock option exercises |  |  | $ 2,000,000 | 6,000,000 | 3,000,000 |  |
Nonqualified stock option award grant date | Aug. 28, 2013 |  |  |  |  |  |
Incremental fair value recognized to stock-based compensation expense | $ 5,000,000 |  |  |  |  |  |
2011 Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares registered for issuance under incentive plan |  |  |  |  |  |  | 17,400,000
Common stock share issuance under plan |  |  | 0 |  |  |  |
2011 Plan | Stock Options |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Closing stock price |  |  | $ 30.38 |  |  |  |
Total intrinsic value |  |  | $ 2,000,000 | 20,000,000 | 8,000,000 |  |
Total fair value of stock options vested |  |  | 15,000,000 | 38,000,000 | 40,000,000 |  |
Cash received from stock option exercises |  |  | $ 2,000,000 | $ 6,000,000 | $ 3,000,000 |  |
Deferred Compensation Plan for Non Employee Directors |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares registered for issuance under incentive plan |  |  |  |  |  |  | 100,000
2018 Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares registered for issuance under incentive plan |  |  |  |  |  | 6,000,000 |
2018 Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares reserved for future stock-based awards under plan |  |  | 10,100,000 |  |  |  |

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