Stockholders' Equity (Details) (USD $)	3 Months Ended		6 Months Ended	9 Months Ended
	Oct. 26, 2014	Oct. 27, 2013	Jul. 27, 2014	Oct. 26, 2014	Oct. 27, 2013	Jan. 26, 2014
Accelerated Share Repurchases [Line Items]
Cost of shares repurchased under stock repurchase program				$ 3,260,000,000
Aggregate maximum amount of common stock to be repurchased	3,700,000,000			3,700,000,000
Stock repurchase program, additional authorized amount				1,000,000,000
Aggregate number of shares repurchased under stock repurchase program (in shares)				205,400,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	438,400,000			438,400,000
Intended return to shareholder in FY2015						1,000,000,000
Treasury Stock, Shares, Acquired	16,800,000		27,400,000
Treasury Stock Acquired, Average Cost Per Share	$ 18.47		$ 18.23
Payments for repurchase of common stock	310,000,000		500,000,000	810,000,000	850,000,000
Dividends, Cash [Abstract]
Payments of Dividends	$ 46,100,000			$ 140,235,000	$ 133,007,000
Cash dividends declared and paid per common share	$ 0.085	$ 0.075		$ 0.255	$ 0.225
Cash dividend per share - annual				$ 0.34
Authorized number of shares of common stock (in shares)	2,000,000,000			2,000,000,000
Par value of common stock	$ 0.001			$ 0.001