Stockholders' Equity (Details) (USD $) In Billions, except Share data, unless otherwise specified	3 Months Ended
	Apr. 28, 2013
Notes to financial statements [Abstract]
Aggregate maximum amount of common stock to be repurchased	$ 2.7
Aggregate number of shares repurchased under stock repurchase program (in shares)	107,300,000
Cost of shares repurchased under stock repurchase program	1.66
Authorized number of shares of common stock (in shares)	2,000,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 1.04
Par value of common stock	$ 0.001