Discontinued Operations (Schedule of Assets and Liabilities of Discontinued Operations) (Details) - USD ($) $ in Millions	Apr. 28, 2019	Jul. 29, 2018	Apr. 29, 2018	Jul. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents	$ 4	$ 8	$ 4	$ 5
Discontinued Operation, Accounts receivable, net	77	84
Discontinued Operation, Inventories	137	161
Other current assets of discontinued operations	2	3
Current assets of discontinued operations	220	256
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent	199	413
Disposal Group, Including Discontinued Operation, Intangible Assets	143	381
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent	4	4
Disposal Group, Including Discontinued Operation, Assets	566	1,054
Disposal Group, Including Discontinued Operation, Accounts Payable	57	79
Disposal Group, Including Discontinued Operation, Accrued Liabilities	43	39
Current liabilities on discontinued operations	100	118
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities	0	(1)
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent	4	5
Disposal Group, Including Discontinued Operation, Liabilities	$ 104	$ 122