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Stockholders' Equity - Additional Information (Details) - USD ($) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 11, 2021 | Dec. 31, 2020 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Repurchased of common stock |  |  |  |  |  | $ 605,000,000 | $ 54,000,000 |  |
Common stock purchases |  |  |  |  |  | 606,000,000 | 47,000,000 | $ 0 |
Cash paid for partial termination of 1.125% Warrants |  |  |  |  |  | $ 30,000,000 | $ 514,000,000 | $ 549,000,000 |
Unrecognized compensation forfeited rate |  |  |  |  |  | 12.20% |  |  |
Stock option expiration period |  |  |  |  |  | 4 years |  |  |
Granted (in shares) |  |  |  |  |  | 0 | 0 | 0 |
RSAs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Maximum award vesting period |  |  |  |  |  | 4 years |  |  |
Weighted average period for recognition |  |  |  |  |  | 2 years 2 months 12 days |  |  |
Unrecognized compensation expense |  | $ 42,000,000 | $ 42,000,000 |  |  | $ 42,000,000 |  |  |
Weighted average period of unrecognized compensation expense |  |  |  |  |  | 2 years 2 months 12 days |  |  |
PSUs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Maximum award vesting period |  |  |  |  |  | 3 years |  |  |
Weighted average period for recognition |  |  |  |  |  | 1 year 2 months 12 days |  |  |
Unrecognized compensation expense |  | $ 23,000,000 | $ 23,000,000 |  |  | $ 23,000,000 |  |  |
Weighted average period of unrecognized compensation expense |  |  |  |  |  | 1 year 2 months 12 days |  |  |
Stock options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Maximum award vesting period |  |  |  |  |  | 4 years |  |  |
Stock option expiration period |  |  |  |  |  | 10 years |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Employee purchase price as a percentage of stock price |  |  |  |  |  | 85.00% |  |  |
Maximum annual contribution per employee |  |  |  |  |  | $ 25,000 |  |  |
Risk-free interest rate, minimum |  |  |  |  |  | 0.20% |  |  |
Risk-free interest rate, maximum |  |  |  |  |  | 2.30% |  |  |
Minimum expected volatility rate inputs for fair value measurement |  |  |  |  |  | 31.00% |  |  |
Maximum expected volatility rate inputs for fair value measurement |  |  |  |  |  | 51.00% |  |  |
Dividend yield |  |  |  |  |  | 0.00% |  |  |
Expected term of awards |  |  |  |  |  | 6 months |  |  |
2019 EIP |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares issued under ESPP (in shares) |  |  |  |  |  |  | 2,900,000 |  |
1.125% Warrants |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stated percentage of warrants |  | 1.125% | 1.125% |  |  | 1.125% |  |  |
Warrants outstanding (in shares) |  | 310,000 | 310,000 |  |  | 310,000 |  |  |
Cash paid for partial termination of 1.125% Warrants |  |  |  | $ 30,000,000 |  |  |  |  |
Stated interest rate |  | 1.125% | 1.125% |  |  | 1.125% |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock authorized |  |  |  |  |  |  | $ 500,000,000 |  | $ 500,000,000
Repurchased of common stock (in shares) |  | 29,000 | 766,000 |  | 3,400,000 | 4,000,000 |  |  |
Repurchased of common stock |  | $ 6,000,000 | $ 159,000,000 |  | $ 446,000,000 |  |  |  |
Common stock purchases |  |  |  | $ 7,000,000 |  |  |  |  |
Average cost (USD per share) |  |  | $ 208.37 |  | $ 132.45 |  |  |  |
Share-based compensation (in shares) |  |  |  |  |  | 1,000,000 |  |  |
Common Stock | Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation (in shares) |  |  |  |  |  | 244,000 | 242,000 |  |
Common Stock | Subsequent Event |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Repurchased of common stock (in shares) | 577,000 |  |  |  |  |  |  |  |
Repurchased of common stock | $ 122,000,000 |  |  |  |  |  |  |  |
Average cost (USD per share) | $ 211.65 |  |  |  |  |  |  |  |

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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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