Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	6 Months Ended
	Jul. 27, 2017	Jun. 30, 2017	Feb. 28, 2015
Payments for Repurchase of Equity [Abstract]
Authorized share repurchase			10,000,000
Stock repurchased, shares		800,000
Stock repurchased, value		$ 102
Average repurchase price per share (in dollars per share)		$ 130.95
Shares authorized and remaining under the repurchase program		6,500,000
Subsequent Event
Payments for Repurchase of Equity [Abstract]
Stock repurchased, shares	200,000
Stock repurchased, value	$ 33
Average repurchase price per share (in dollars per share)	$ 150.37