Earnings Per Share And Shareholders' Equity (Schedule of Company's Repurchase Program) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	6 Months Ended												12 Months Ended	3 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 28, 2012 February Repurchase Program [Member]	Jul. 28, 2012 February 2012 [Member]		Jul. 28, 2012 November 2011 [Member]	Jul. 30, 2011 May 2011 [Member]		Jul. 30, 2011 March 2011 [Member]		Jul. 30, 2011 November 2010 [Member]		Jan. 29, 2011 November 2010 [Member]	Jul. 28, 2012 Share Repurchase Program [Member] February Repurchase Program [Member]
Amount Authorized				$ 500	[1]	$ 250	$ 500	[2]	$ 500	[2]	$ 200	[2]
Shares Repurchased	13,302	24,876		9,645	[1]	3,657	7,750		13,695	[2]	3,431			0
Amount Repurchased	603	905		439	[1]	164	296	[2]	500	[2]	109
Treasury Stock Acquired, Average Cost Per Share				$ 45.54		$ 44.90	$ 38.13		$ 36.49		$ 31.65
Remaining authorized repurchase amount			$ 61										$ 31

[1] (b)The November 2010 repurchase program had $31 million remaining at the time it was cancelled in conjunction with the approval of the March 2011 repurchase program.

[2] (a)The February 2012 repurchase program had $61 million remaining as of July 28, 2012.