Discontinued Operations (Schedule of Assets and Liabilites of Discontinued Operations) (Details) - USD ($) $ in Millions	Jul. 28, 2019	Jul. 29, 2018	Jul. 30, 2017	Jul. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents	$ 148	$ 177	$ 282	$ 230
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net		222
Disposal Group, Including Discontinued Operation, Inventory		312
Disposal Group, Including Discontinued Operation, Other Assets, Current		15
Current assets of discontinued operations	428	726
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent		767
Disposal Group, Including Discontinued Operation, Goodwill		716
Disposal Group, Including Discontinued Operation, Intangible Assets		532
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent		35
Disposal Group, Including Discontinued Operation, Assets		2,776
Disposal Group, Including Discontinued Operation, Accounts Payable		188
Disposal Group, Including Discontinued Operation, Accrued Liabilities		160
Disposal Group, Including Discontinued Operation, Accrued Income Tax Payable		12
Current liabilities of discontinued operations	469	731
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities		35
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent		22
Disposal Group, Including Discontinued Operation, Liabilities		795
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	148	169
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	135	138
Disposal Group, Including Discontinued Operation, Inventory	135	151
Disposal Group, Including Discontinued Operation, Other Assets, Current	10	12
Current assets of discontinued operations	428	470
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent	340	354
Disposal Group, Including Discontinued Operation, Goodwill	661	716
Disposal Group, Including Discontinued Operation, Intangible Assets	135	151
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent	31	31
Disposal Group, Including Discontinued Operation, Assets	1,595	1,722
Disposal Group, Including Discontinued Operation, Accounts Payable	109	109
Disposal Group, Including Discontinued Operation, Accrued Liabilities	114	121
Disposal Group, Including Discontinued Operation, Accrued Income Tax Payable	14	12
Current liabilities of discontinued operations	469	613
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities	32	36
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent	27	17
Disposal Group, Including Discontinued Operation, Liabilities	534	673
Campbell Fresh [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		8
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net		84
Disposal Group, Including Discontinued Operation, Inventory		161
Disposal Group, Including Discontinued Operation, Other Assets, Current		3
Current assets of discontinued operations		256
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent		413
Disposal Group, Including Discontinued Operation, Goodwill		0
Disposal Group, Including Discontinued Operation, Intangible Assets		381
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent		4
Disposal Group, Including Discontinued Operation, Assets		1,054
Disposal Group, Including Discontinued Operation, Accounts Payable		79
Disposal Group, Including Discontinued Operation, Accrued Liabilities		39
Disposal Group, Including Discontinued Operation, Accrued Income Tax Payable		0
Current liabilities of discontinued operations		118
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities		(1)
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent		5
Disposal Group, Including Discontinued Operation, Liabilities		122
Debt [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Other Liabilities, Current		371
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent		7
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	232	371
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent	$ 6	7
Debt [Member] | Campbell Fresh [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
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent		$ 0