Stockholders' Equity (Details) (USD $)	3 Months Ended			9 Months Ended
	Jan. 26, 2014	Oct. 27, 2013	Jul. 28, 2013	Oct. 27, 2013
Accelerated Share Repurchases [Line Items]
Cost of shares repurchased under stock repurchase program				$ 2,410,000,000
Aggregate maximum amount of common stock to be repurchased				2,700,000,000
Stock repurchase program, additional authorized amount	1,000,000,000
Accelerated Share Repurchases, Settlement (Payment) or Receipt		750,000,000		750,000,000
Treasury Stock, Shares, Acquired		14,600,000	36,900,000	51,500,000
Treasury Stock Acquired, Average Cost Per Share		$ 14.56
Aggregate number of shares repurchased under stock repurchase program (in shares)				159,000,000
Authorized number of shares of common stock (in shares)		2,000,000,000		2,000,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 1,290,000,000			$ 285,700,000
Par value of common stock		$ 0.001		$ 0.001