Financing (Detail Of Debt Repayments) (Details) - USD ($) $ in Millions				12 Months Ended
	Aug. 15, 2016	Aug. 17, 2015	Nov. 18, 2014	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Extinguishment of debt			$ 407
Debt repaid				$ 751	$ 152	$ 870
8.125% Senior Debentures Due 2035 [Member]
Extinguishment of debt	$ 108	$ 76		$ 0	76	0
Debt instrument interest rate, stated percentage	7.875%	8.125%		8.125%
5.75% Senior Notes due 2014 [Member]
Extinguishment of debt				$ 0	0	453
Debt instrument interest rate, stated percentage				5.75%
7.625% Senior Debentures Due 2013 [Member]
Extinguishment of debt				$ 0	0	407
Debt instrument interest rate, stated percentage				7.875%
9.5% Amortizing Debentures Due 2021 [Member]
Extinguishment of debt				$ 4	4	4
Debt instrument interest rate, stated percentage				9.50%
9.75% Amortizing Debentures Due 2021 [Member]
Extinguishment of debt				$ 2	3	2
Debt instrument interest rate, stated percentage				9.75%
Capital Lease and Other Long-Term Obligations [Member]
Extinguishment of debt				$ 1	0	4
5.90% Senior Notes Due 2016 [Member]
Extinguishment of debt				$ 577	0	0
Debt instrument interest rate, stated percentage				5.90%
7.875% Senior Notes Due 2015 [Member]
Extinguishment of debt				$ 108	0	0
Debt instrument interest rate, stated percentage				7.875%
7.5% Senior Debentures Due 2015 [Member]
Extinguishment of debt				$ 0	69	0
Debt instrument interest rate, stated percentage				7.50%
7.45% Senior Debentures Due 2016 [Member]
Extinguishment of debt				$ 59	$ 0	$ 0
Debt instrument interest rate, stated percentage				7.45%