Taxes (Reconciliation Of Beginning And Ending Amount Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Balance, beginning of period	$ 178	$ 172	$ 189
Additions based on tax positions related to the current year	16	30	33
Additions for tax positions of prior years	0	0	0
Reductions for tax positions of prior years	(12)	(7)	(15)
Settlements	(4)	(3)	(23)
Statute expirations	(11)	(14)	(12)
Balance, end of period	167	178	172
Current income taxes				$ 6	$ 12	$ 11
Unrecognized tax benefits	$ 178	$ 172	$ 189	167	178	172
Long term deferred income taxes [Member]
Long-term uncertian tax positions				4	5	6
Other noncurrent liabilities [Member]
Long-term uncertian tax positions				$ 157	$ 161	$ 155