Stockholders' Equity - Additional Information (Details) - USD ($) $ in Millions |
9 Months Ended | ||
|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Feb. 28, 2015 |
|
| Stockholders Equity Note [Line Items] | |||
| Shares of common stock repurchased | 1,000,000 | ||
| Aggregate cost of shares repurchased | $ 65 | $ 39 | |
| Share of common stock available for repurchase | 6,800,000 | ||
| Maximum | |||
| Stockholders Equity Note [Line Items] | |||
| Shares available under the program to purchase outstanding common stock | 10,000,000 | ||