Financing Activities (Detail Of Debt Repayments) (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Extinguishment of debt	$ 146
Debt repaid	149	$ 3
9.5% Amortizing Debentures due 2021
Extinguishment of debt	2	2
9.75% Amortizing Debentures Due 2021
Extinguishment of debt	1	1
6.7% Senior Debentures Due 2034
Extinguishment of debt	11	0
6.375% Senior Notes Due 2037
Extinguishment of debt	$ 135	$ 0