Earnings Per Share (Computation Of Basic and Diluted Earnings Per Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 28, 2012	Jul. 30, 2011
Earnings Per Share [Abstract]
Net income	$ 279	$ 241	$ 460	$ 372
Net income available to common stockholders, basic	279	241	460	372
Net income available to common stockholders, diluted	$ 279	$ 241	$ 460	$ 372
Basic earnings per share	$ 0.68	$ 0.56	$ 1.11	$ 0.87
Diluted earnings per share	$ 0.67	$ 0.55	$ 1.09	$ 0.86
Average number of shares issued, basic	410.2	426.5	412.8	425.3
Shares to be issued under deferred compensation plans	1.0	1.0	1.3	1.0
Average number of shares outstanding, basic	411.2	427.5	414.1	426.3
Effect of dilutive securities-stock options, restricted stock and restricted stock units	5.9	7.1	6.6	6.0
Average number of shares outstanding, diluted	417.1	434.6	420.7	432.3