Supplemental Financial Statement Data (Schedule of Statements of Cash Flow) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Aug. 03, 2014	Jul. 28, 2013	Jul. 29, 2012
Statement of Financial Position [Abstract]
Non-cash Compensation Benefit Related Expense	$ 114	$ 134	$ 106
Other Noncash Operating Activities, Cash Flow Statement	4	21	12
Other Noncash Income (Expense)	118	155	118
Employee Benefits And Deferred Compensation Payments	(52)	(54)	(84)
Other Operating Activities, Cash Flow Statement	(1)	(4)	(2)
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities	(53)	(58)	(86)
Interest Paid	122	124	115
Interest Received	3	10	8
Income Taxes Paid, Net	$ 421	$ 345	$ 300