Financing Activities (Detail Of Debt Repayments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 28, 2012	Apr. 30, 2011
Debt repaid	$ 795	$ 335
5.35% Senior Notes Due 2012 [Member]
Extinguishment of Debt, Amount	616	0
8.0% Senior Debentures Due 2012 [Member]
Extinguishment of Debt, Amount	173	0
6.625% Senior Notes Due 2011 [Member]
Extinguishment of Debt, Amount	0	330
9.5% Amortizing Debentures Due 2021 [Member]
Extinguishment of Debt, Amount	2	2
9.75% Amortizing Debentures Due 2021 [Member]
Extinguishment of Debt, Amount	1	1
Capital Lease and Other Long-Term Obligations [Member]
Extinguishment of Debt, Amount	$ 3	$ 2