Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Jul. 31, 2016	May 01, 2016	Jan. 31, 2016	Nov. 01, 2015	Aug. 02, 2015	May 03, 2015	Feb. 01, 2015	Nov. 02, 2014	Jul. 31, 2016	Aug. 02, 2015	Aug. 03, 2014
Taxes on earnings									$ 286	$ 283	$ 374
Fiscal Period Duration									364 days	364 days	371 days
Earnings Per Share, Diluted	$ (0.26)	$ 0.59	$ 0.85	$ 0.62	$ 0.05	$ 0.57	$ 0.71	$ 0.78	$ 1.81	$ 2.13	$ 2.74
Building [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life									45 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life									20 years
Restatement Adjustment [Member]
Taxes on earnings	$ 13
Earnings Per Share, Diluted	$ 0.04