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Stockholders' Equity - Additional Information (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Feb. 07, 2020 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2013 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Repurchased of common stock |  |  |  | $ 54,000,000 |  |  |  |
Cash paid for partial termination of 1.125% Warrants |  |  |  | 514,000,000 | $ 549,000,000 | $ 0 |  |
Unrecognized compensation expense | $ 49,000,000 |  | $ 49,000,000 | $ 49,000,000 |  |  |  |
Unrecognized compensation forfeited rate |  |  |  | 15.90% |  |  |  |
Weighted average grant date fair value of stock options granted (usd per share) |  |  |  | $ 41.43 |  |  |  |
Common stock issued during period (in shares) |  |  |  | 142,000 | 216,000 | 351,000 |  |
RSAs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Maximum award vesting period |  |  |  | 4 years |  |  |  |
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] |  |  |  |  |  |  |  |
Weighted average period of unrecognized compensation expense |  |  |  | 1 year 7 months 6 days |  |  |  |
Stock options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Maximum award vesting period |  |  |  | 4 years |  |  |  |
Unrecognized compensation expense | $ 4,000,000 |  | $ 4,000,000 | $ 4,000,000 |  |  |  |
Weighted average period of unrecognized compensation expense |  |  |  | 9 months 18 days |  |  |  |
Stock option expiration period |  |  |  | 10 years |  |  |  |
Risk free interest rate |  |  |  | 2.30% |  |  |  |
Expected volatility rate |  |  |  | 38.40% |  |  |  |
Dividend yield |  |  |  | 0.00% |  |  |  |
Expected term of awards |  |  |  | 8 years 4 months 24 days |  |  |  |
Options exercised, intrinsic value |  |  |  |  |  | $ 2,000,000 |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Dividend yield |  |  |  | 0.00% | 0.00% | 0.00% |  |
Expected term of awards |  |  |  | 6 months | 6 months | 6 months |  |
Employee purchase price as a percentage of stock price |  |  |  | 85.00% |  |  |  |
Maximum annual contribution per employee |  |  |  | $ 25,000 |  |  |  |
Risk-free interest rate, minimum |  |  |  | 0.60% | 0.60% | 0.60% |  |
Risk-free interest rate, maximum |  |  |  | 2.30% | 2.30% | 2.30% |  |
Minimum expected volatility rate inputs for fair value measurement |  |  |  | 31.00% | 31.00% | 31.00% |  |
Maximum expected volatility rate inputs for fair value measurement |  |  |  | 45.00% | 45.00% | 45.00% |  |
2019 EIP |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares issued under ESPP (in shares) |  |  |  |  |  |  |  | 2,900,000
2019 ESPP |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares issued under ESPP (in shares) |  |  |  |  |  |  |  | 3,000,000.0
1.125% Warrants |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stated interest rate | 1.125% |  | 1.125% | 1.125% |  |  |  |
Number of warrants issued (in shares) |  |  |  |  |  |  | 13,500,000 |
Striking price of warrants (USD per share) |  |  |  |  |  |  | $ 53.8475 |
Class of warrant | 310,000 |  | 310,000 | 310,000 |  |  |  |
Cash paid for partial termination of 1.125% Warrants |  |  |  | $ 514,000,000 |  |  |  |
Number of warrants terminated (in shares) |  |  |  | 5,900,000 |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock authorized | $ 500,000,000 |  | $ 500,000,000 | $ 500,000,000 |  |  |  |
Repurchased of common stock (in shares) | 55,000 |  |  | 400,000 |  |  |  |
Repurchased of common stock | $ 7,000,000 |  |  | $ 54,000,000 |  |  |  |
Average cost (USD per share) |  |  | $ 135.30 |  |  |  |  |
Share-based compensation (in shares) |  |  |  | 242,000 | 365,000,000 |  |  |
Subsequent Event | Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Repurchased of common stock (in shares) |  | 1,533,000 |  |  |  |  |  |
Repurchased of common stock |  | $ 203,000,000 |  |  |  |  |  |
Average cost (USD per share) |  | $ 132.69 |  |  |  |  |  |

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- Definition The estimated measure of the 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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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