Segment information (Reconciliation of Net Sales from Segment to Consolidated) (Details) (USD $) In Millions	3 Months Ended
	Apr. 30, 2011		May 01, 2010
Total net sales	$ 3,295		$ 3,329
United States [Member]
Total net sales	2,622	[1]	2,714	[1]
Foreign [Member]
Total net sales	$ 673		$ 615

[1] U.S. includes the United States and Puerto Rico.