Repurchase of Common Stock (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended	12 Months Ended	24 Months Ended
	Apr. 30, 2016	Jan. 30, 2016	Jan. 27, 2018	Feb. 25, 2016	Jun. 30, 2011
June 2011 share repurchase program [Domain]
Accelerated Share Repurchases [Line Items]
Stock Repurchased and Retired During Period, Shares	3.3
Stock Repurchased and Retired During Period, Value	$ 101.0
January 2016 ASR [Domain]
Accelerated Share Repurchases [Line Items]
Stock Repurchased and Retired During Period, Shares	1.6	4.4
Stock Repurchased and Retired During Period, Shares	1.7
Stock Repurchased and Retired During Period, Value	$ 45.0	$ 120.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 2,900.0	$ 3,000.0
Stock Repurchase Program, Authorized Amount				$ 1,000.0	$ 5,000.0
Stock Repurchase Program, Period in Force			2 years
Open market [Domain] | June 2011 share repurchase program [Domain]
Accelerated Share Repurchases [Line Items]
Unsettled shares, shares	0.1
Stock Repurchased and Retired During Period, Value	$ 56.0
Unsettled shares, cost	$ 4.0