Stockholders' Equity (Details) (USD $) In Billions, except Share data	9 Months Ended
	Oct. 30, 2011
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)	90,900,000
Cost of shares repurchased under stock repurchase program	1.46
Authorized cost of shares to be repurchased	$ 1.24
Authorized number of shares of common stock (in shares)	2,000,000,000
Par value of common stock	$ 0.001