Stockholders' Equity (Details) (USD $)	3 Months Ended			6 Months Ended
	Jul. 27, 2014	Apr. 27, 2014	Jul. 28, 2013	Jul. 27, 2014	Jul. 28, 2013	Jan. 26, 2014
Accelerated Share Repurchases [Line Items]
Cost of shares repurchased under stock repurchase program				$ 2,950,000,000
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
Treasury Stock, Shares, Acquired	6,800,000	20,600,000		27,400,000
Treasury Stock Acquired, Average Cost Per Share	$ 18.23
Aggregate number of shares repurchased under stock repurchase program (in shares)				188,700,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	748,400,000			748,400,000
Intended return to shareholder in FY2015						1,000,000,000
Payments for Repurchase of Common Stock		500,000,000		500,000,000	850,000,000
Payments of Dividends	$ 47,400,000			$ 94,163,000	$ 89,610,000
Cash dividends declared and paid per common share	$ 0.085		$ 0.075	$ 0.170	$ 0.150
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