Document and Entity Information Document - USD ($)	12 Months Ended
	Jul. 28, 2019	Sep. 18, 2019	Jan. 25, 2019
Entity Information [Line Items]
Entity Registrant Name	CAMPBELL SOUP CO
Entity Central Index Key	0000016732
Current Fiscal Year End Date	--07-28
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Jul. 28, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		301,186,638
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 6,542,735,608
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false