Subsequent Events (Details) - USD ($) $ / shares in Units, shares in Millions						2 Months Ended	12 Months Ended
	Jan. 26, 2017	Oct. 25, 2016	Jul. 26, 2016	Apr. 28, 2016	Jan. 27, 2016	Feb. 24, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Feb. 16, 2017	Jul. 31, 2015	Oct. 31, 2014
Subsequent Event [Line Items]
Cash dividends declared per share of common stock (in dollars per share)		$ 0.10	$ 0.10	$ 0.10	$ 0.10		$ 0.40	$ 0.40	$ 0.20
Stock Repurchase Program 2014 [Member]
Subsequent Event [Line Items]
Additional amount authorized under Stock Repurchase Plan											$ 500,000,000	$ 1,300,000,000.0
Repurchases under stock repurchase programs, average price (in dollar per share)							$ 23.25	$ 25.16	$ 22.42
Stock repurchase program, remaining authorized repurchase amount							$ 219,700,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Cash dividends declared per share of common stock (in dollars per share)	$ 0.10
Subsequent Event [Member] | Stock Repurchase Program 2014 [Member]
Subsequent Event [Line Items]
Additional amount authorized under Stock Repurchase Plan										$ 500,000,000
Common stock repurchased (in shares)						4.5
Common stock repurchased, value						$ 125,000,000
Repurchases under stock repurchase programs, average price (in dollar per share)						$ 28.03
Repurchases settled (in shares)						3.7
Stock repurchase program, remaining authorized repurchase amount						$ 594,700,000