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
	Apr. 28, 2012	Apr. 30, 2011
Earnings Per Share [Abstract]
Net income (loss)	$ 181	$ 131
Net income (loss) available to common stockholders, basic	181	131
Net income (loss) available to common stockholders, diluted	$ 181	$ 131
Basic earnings per share	$ 0.43	$ 0.31
Diluted earnings per share	$ 0.43	$ 0.30
Average number of shares issued, basic	415.4	424.1
Shares to be issued under deferred compensation plans	1.7	1.0
Average number of shares outstanding, basic	417.1	425.1
Effect of dilutive securities-stock options, restricted stock and restricted stock units	7.2	4.9
Average number of shares outstanding, diluted	424.3	430.0