Supplemental Financial Statement Data (Schedule of Statements of Cash Flow) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2016	Aug. 02, 2015	Aug. 03, 2014
Statement of Financial Position [Abstract]
Employee Benefits And Deferred Compensation Payments	$ (55)	$ (53)	$ (52)
Other Operating Activities, Cash Flow Statement	(3)	1	(1)
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities	(58)	(52)	(53)
Interest Paid	113	111	122
Interest Received	4	3	3
Income Taxes Paid, Net	$ 325	$ 333	$ 421