Accelerated Share Repurchase Agreement (Details) (Current Stock Repurchase Program [Member], USD $) In Millions, unless otherwise specified			0 Months Ended				9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 Maximum [Member]	Aug. 01, 2014 July 30 2014 Accelerated Share Repurchase Agreement [Member]	Sep. 30, 2014 July 30 2014 Accelerated Share Repurchase Agreement [Member]	Aug. 01, 2014 July 30 2014 Accelerated Share Repurchase Agreement [Member]	Jul. 30, 2014 July 30 2014 Accelerated Share Repurchase Agreement [Member]	Sep. 30, 2014 July 30 2014 Accelerated Share Repurchase Agreement [Member] Estimate
Accelerated Share Repurchase Agreement
Amount of common stock repurchased						$ 300
Cost to repurchase common shares			300
Delivery of shares			3.2
Delivery of holdback shares							0.7
Shares repurchased, as percent to the anticipated shares to be repurchased					80.00%
Remaining shares available to be repurchased under its program	0.8
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		4.0
Amount of holdback				$ 60