Earnings Per Share And Shareholders' Equity (Schedule of Company's Repurchase Program) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	9 Months Ended				12 Months Ended	9 Months Ended					0 Months Ended		9 Months Ended		0 Months Ended		9 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 29, 2011 November 2010 [Member]		Jan. 29, 2011 November 2010 [Member]	Oct. 29, 2011 March 2011 Repurchase Program [Member]		Oct. 29, 2011 May 2011 Repurchase Program [Member]		Oct. 27, 2012 November 2011 [Member]	Nov. 12, 2012 February 2012 Repurchase Program [Member]		Oct. 27, 2012 February 2012 Repurchase Program [Member]		Nov. 12, 2012 February 2012 Repurchase Program [Member] Subsequent Event [Member]	Nov. 23, 2012 November 2012 Repurchase Program [Member] Subsequent Event [Member]	Oct. 27, 2012 November 2012 Repurchase Program [Member] Subsequent Event [Member]
Amount Authorized			$ 200	[1]		$ 500	[1]	$ 500	[1]	$ 250			$ 500	[2]			$ 250	[2]
Treasury Stock, Shares, Acquired	13,473	29,661	3,431			13,695	[1]	12,535		3,657			9,816	[2]	55	53
Treasury Stock, Value, Acquired, Cost Method	612	1,077	109			500	[1]	468	[1]	164			448	[2]	2	2
Treasury Stock Acquired, Average Cost Per Share			$ 31.65			$ 36.49		$ 37.30		$ 44.90			$ 45.60
Remaining authorized repurchase amount					31						50	[2]	52
Share repurchase reflected in Accounts payable													$ 0

[1] (a)The February 2012 repurchase program had $52 million remaining as of October 27, 2012.

[2] (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.