Accumulated Other Comprehensive Loss (Activity Associated With Accumulated Other Comprehensive Loss) (Detail) (USD $) In Millions	3 Months Ended
	Apr. 30, 2011	May 01, 2010
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss, at beginning of period	$ (730)	$ (753)
Unrealized loss on marketable equity securities, net of income tax effect of $1 million and $1 million	(2)	(2)
Reclassification of realized gain on marketable equity securities to net income, net of income tax effect of $4 million	(8)	0
Post employment and postretirement benefit plans:
Recognition of net actuarial (gain) loss, net of income tax effect of $9 million and $6 million	13	9
Prior service cost, net of income tax effect	0	0
Accumulated other comprehensive loss, at end of period	$ (727)	$ (746)