Document and Entity Information Document - USD ($)	12 Months Ended
	Jul. 29, 2018	Sep. 17, 2018	Jan. 26, 2018
Entity Information [Line Items]
Entity Registrant Name	CAMPBELL SOUP CO
Entity Central Index Key	0000016732
Current Fiscal Year End Date	--07-29
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Jul. 29, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		300,656,129
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 9,014,993,646