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. 27, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011
Earnings Per Share [Abstract]
Net income	$ 145	$ 139	$ 605	$ 511
Net income available to common stockholders, basic	145	139	605	511
Net income available to common stockholders, diluted	$ 145	$ 139	$ 605	$ 511
Basic earnings per share	$ 0.36	$ 0.33	$ 1.48	$ 1.20
Diluted earnings per share	$ 0.36	$ 0.32	$ 1.45	$ 1.18
Average number of shares issued, basic	400.3	424.3	408.7	425.0
Shares to be issued under deferred compensation plans	1.0	1.0	1.2	1.0
Average number of shares outstanding, basic	401.3	425.3	409.9	426.0
Effect of dilutive securities-stock options, restricted stock and restricted stock units	6.6	6.5	6.6	6.2
Average number of shares outstanding, diluted	407.9	431.8	416.5	432.2