Financing Activities (Detail Of Debt Repayments) (Details) - USD ($) $ in Millions	9 Months Ended
	Oct. 28, 2017	Oct. 29, 2016
Extinguishment of debt	$ 247
Debt repaid	554	$ 174
seven point four five senior debentures due 2017 [Member]
Extinguishment of debt	300	0
7.45% Senior notes due 2016 [Member]
Extinguishment of debt	0	59
7.875% senior debentures [Member]
Extinguishment of debt	0	108
9.5% Amortizing Debentures due 2021
Extinguishment of debt	4	4
9.75% Amortizing Debentures Due 2021
Extinguishment of debt	2	2
Capital Lease and Other Long-Term Obligations [Member]
Extinguishment of debt	1	1
6.375% Senior Notes Due 2037
Extinguishment of debt	135	0
6.9% senior debentures due 2032
Extinguishment of debt	72	0
6.7% Senior Debentures Due 2034
Extinguishment of debt	28	0
6.65% senior debentures due 2024
Extinguishment of debt	4	0
6.9% senior debentures due 2029
Extinguishment of debt	3	0
6.7% senior debentures due 2028
Extinguishment of debt	3	0
7.0% senior debentures due 2028
Extinguishment of debt	$ 2	$ 0