Financing (Detail Of Debt Repayments) (Details) (USD $) In Millions	3 Months Ended
	Apr. 30, 2011	May 01, 2010
Debt repaid	$ 335	$ 505
6.625% Senior Notes Due 2011 [Member]
Debt repaid	330	57
7.45% Senior Debentures Due 2011 [Member]
Debt repaid	0	9
5.35% Senior Notes Due 2012 [Member]
Debt repaid	0	425
8.0% Senior Debentures Due 2012 [Member]
Debt repaid	0	9
9.5% Amortizing Debentures Due 2021 [Member]
Debt repaid	2	2
9.75% Amortizing Debentures Due 2021 [Member]
Debt repaid	1	1
Capital Leases and Other Obligations [Member]
Debt repaid	$ 2	$ 2