Divestitures (Schedule of Assets and Liabilites of Discontinued Operations) (Details) - USD ($) $ in Millions	Oct. 27, 2019	Jul. 28, 2019	Oct. 28, 2018	Jul. 29, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents	$ 115	$ 148	$ 120	$ 177
Disposal Group, Including Discontinued Operation, Assets, Current, Total	315	428
Current liabilities of discontinued operations	183	469
Campbell International [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents	115	148
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	101	135
Disposal Group, Including Discontinued Operation, Inventory	92	135
Disposal Group, Including Discontinued Operation, Other Assets, Current	7	10
Disposal Group, Including Discontinued Operation, Assets, Current, Total	315	428
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent	309	340
Disposal Group, Including Discontinued Operation, Goodwill	585	661
Disposal Group, Including Discontinued Operation, Intangible Assets	9	135
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent	41	31
Disposal Group, Including Discontinued Operation, Assets, Total	1,259	1,595
Disposal Group, Including Discontinued Operation, Accounts Payable	82	109
Disposal Group, Including Discontinued Operation, Accrued Liabilities	89	114
Disposal Group, Including Discontinued Operation, Accrued Income Tax Payable	12	14
Current liabilities of discontinued operations	183	469
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities	0	32
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent	34	27
Disposal Group, Including Discontinued Operation, Liabilities	224	534
Debt [Member] | Campbell International [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Other Liabilities, Current	0	232
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent	$ 7	$ 6