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Segment Information (Schedule of Segment Reporting - Capital Expenditures) (Details) - USD ($) $ in Millions		3 Months Ended
		Nov. 02, 2025	Oct. 27, 2024
Segment Reporting Information [Line Items]
Segment Expenditure, Addition to PP&E		$ 127	$ 110
Meals & Beverages [Member]
Segment Reporting Information [Line Items]
Segment Expenditure, Addition to PP&E		71	34
Snacks [Member]
Segment Reporting Information [Line Items]
Segment Expenditure, Addition to PP&E		43	46
Corporate
Segment Reporting Information [Line Items]
Segment Expenditure, Addition to PP&E	[1]	$ 13	$ 30
[1] Represents primarily corporate offices and enterprise-wide information technology systems.

X

- Definition

Amount of expenditure for addition to long-lived assets. Excludes expenditure for addition to financial instrument, long-term customer relationship of financial institution, mortgage and other servicing rights, deferred policy acquisition cost, and deferred tax assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	cpb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

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.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=cpb_SnacksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateAndOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: