Financing Activities (Detail Of Debt Repayments) (Details) - USD ($) $ in Millions	9 Months Ended
	Oct. 29, 2016	Oct. 31, 2015
Debt repaid	$ 174	$ 152
7.875% Senior Notes Due 2036[Member]
Extinguishment of debt	108	0
7.45% Senior Debentures Due 2016 [Member]
Extinguishment of debt	59	0
8.125% Senior Debentures Due 2035 [Member]
Extinguishment of debt	0	76
7.5% Senior Debentures Due 2015 [Member]
Extinguishment of debt	0	69
9.5% Amortizing Debentures due 2021 [Member]
Extinguishment of debt	4	4
9.75% Amortizing Debentures Due 2021 [Member]
Extinguishment of debt	2	2
Capital Lease and Other Long-Term Obligations [Member]
Extinguishment of debt	$ 1	$ 1