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		9 Months Ended
	Oct. 29, 2011	Oct. 30, 2010	Oct. 29, 2011	Oct. 30, 2010
Earnings Per Share [Abstract]
Net income	$ 139	$ 10	$ 511	$ 180
Average number of shares issued, basic	424.3	422.4	425.0	421.9
Shares to be issued under deferred compensation plans	1.0	1.1	1.0	1.1
Net income available to common stockholders, basic	139	10	511	180
Average number of shares outstanding, basic	425.3	423.5	426.0	423.0
Basic earnings per share	$ 0.33	$ 0.02	$ 1.20	$ 0.43
Effect of dilutive securities-stock options, restricted stock and restricted stock units	6.5	4.1	6.2	3.7
Net income available to common stockholders, diluted	$ 139	$ 10	$ 511	$ 180
Average number of shares outstanding, diluted	431.8	427.6	432.2	426.7
Diluted earnings per share	$ 0.32	$ 0.02	$ 1.18	$ 0.42