Supplemental Financial Statement Data (Schedule of Statements of Cash Flow) (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 02, 2020	Jul. 28, 2019	Jul. 29, 2018
Operating Lease, Expense	$ 75	$ 0	$ 0
Amortization of Debt Issuance Costs	9	14	4
Employee Benefit and Share-based Payment Arrangement, Noncash	12	6	8
Other Noncash Expense	5	4	12
Other Noncash Income (Expense)	101	24	24
Employee Benefits And Deferred Compensation Payments	(53)	(60)	(59)
Other Noncash Operating Activities, Cash Flow Statement	(6)	(4)	5
Other	(59)	(64)	(54)
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	287	367	152
Interest Received	4	3	4
Income Taxes Paid, Net	$ 222	$ 117	$ 128