Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Amount of tax expense (benefit) on gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Amount of other expense attributable to disposal group, including, but not limited to, discontinued operation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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Discontinued Operations (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended	12 Months Ended
	Sep. 23, 2019	Jul. 28, 2019	Apr. 28, 2019	Jan. 27, 2019	Oct. 28, 2018	Jan. 26, 2020	Jul. 28, 2019	Jul. 29, 2018	Jul. 30, 2017
Arnott's and International [Member] \| Scenario, Forecast [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses						$ 2,200
Campbell Fresh [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax							$ (32)	$ 0	$ 0
Discontinued Operation, Tax expense (benefit) of loss / costs associated with selling the businesses							19	0	0
Campbell Fresh [Member] \| Costs Associated With Sale Of Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax							(32)
Campbell Fresh [Member] \| Deferred tax asset write-off [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Tax expense (benefit) of loss / costs associated with selling the businesses							29
Kelsen [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Impairment charges		$ 10
Kelsen [Member] \| Trademarks [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Impairment charges		7
Kelsen [Member] \| Subsequent Event [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses	$ 300
Campbell International [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax							(12)	0	0
Discontinued Operation, Tax expense (benefit) of loss / costs associated with selling the businesses							(2)	$ 0	$ 0
Campbell International [Member] \| Costs Associated With Sale Of Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax							$ (12)
U.S Refrigerated Soup & Garden Fresh Gourmet [Member] \| Campbell Fresh [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses			$ 55
Bolthouse Farms [Member] \| Campbell Fresh [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses		$ 500
Bolthouse Farms refrigerated beverages and salad dressing [Member] \| Campbell Fresh [Member] \| Customer Relationships [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Impairment charges				$ 22
Bolthouse Farms refrigerated beverages and salad dressing [Member] \| Campbell Fresh [Member] \| Trademarks [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Impairment charges				74
Bolthouse Farms refrigerated beverages and salad dressing [Member] \| Campbell Fresh [Member] \| Property, Plant and Equipment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Impairment charges				9
Garden Fresh Gourmet [Member] \| Campbell Fresh [Member] \| Customer Relationships [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Impairment charges				39
Garden Fresh Gourmet [Member] \| Campbell Fresh [Member] \| Trademarks [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Impairment charges				23
Garden Fresh Gourmet [Member] \| Campbell Fresh [Member] \| Property, Plant and Equipment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Impairment charges				2
Bolthouse Farms carrot and carrot ingredients [Member] \| Campbell Fresh [Member] \| Customer Relationships [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Impairment charges				40
Bolthouse Farms carrot and carrot ingredients [Member] \| Campbell Fresh [Member] \| Technology-Based Intangible Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Impairment charges				15
Bolthouse Farms carrot and carrot ingredients [Member] \| Campbell Fresh [Member] \| Trademarks [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Impairment charges				18
Bolthouse Farms carrot and carrot ingredients [Member] \| Campbell Fresh [Member] \| Property, Plant and Equipment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Impairment charges				$ 104
U.S. Refrigerated Soup [Member] \| Campbell Fresh [Member] \| Property, Plant and Equipment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Impairment charges					$ 14