Financing Activities (Detail Of Debt Repayments) (Details) - USD ($) $ in Millions	9 Months Ended
	Oct. 31, 2015	Nov. 01, 2014
Debt repaid	$ 152	$ 462
Seven Point Five Percent Senior Debentures Due Two Thousand Fifteen [Member]
Extinguishment of debt	69	0
Eight Point One Two Five Percent Senior Debentures Due Two Thousand Thirty Five [Member]
Extinguishment of debt	76	0
Five point seven five percent senior notes due 2014[Member]
Extinguishment of debt	0	453
9.5% Amortizing Debentures due Two Thousand Twenty One [Member]
Extinguishment of debt	4	4
9.75% Amortizing Debentures Due Two Thousand Twenty One [Member]
Extinguishment of debt	2	2
Capital Lease and Other Long-Term Obligations [Member]
Extinguishment of debt	$ 1	$ 3