Financing Activities (Detail Of Debt Repayments) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Oct. 27, 2012	Oct. 29, 2011
Debt repaid	$ 803	$ 451
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
7.45% Senior Debentures Due 2011 [Member]
Extinguishment of Debt, Amount	0	109
9.5% Amortizing Debentures Due 2021 [Member]
Extinguishment of Debt, Amount	4	4
9.75% Amortizing Debentures Due 2021 [Member]
Extinguishment of Debt, Amount	2	2
Capital Lease and Other Long-Term Obligations [Member]
Extinguishment of Debt, Amount	$ 8	$ 6