Document and Entity Information Document - shares	9 Months Ended
	Apr. 26, 2020	May 27, 2020
Document and Entity Information [Abstract]
Entity Registrant Name	CAMPBELL SOUP CO
Entity Central Index Key	0000016732
Current Fiscal Year End Date	--08-02
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Apr. 26, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		302,164,426
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Address, Address Line One	1 Campbell Place
Entity Address, City or Town	Camden
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	08103
City Area Code	856
Local Phone Number	342-4800
Entity Interactive Data Current	Yes
Entity File Number	1-3822
Title of 12(b) Security	Capital Stock, par value $.0375
Trading Symbol	CPB
Security Exchange Name	NYSE
Document Quarterly Report	true
Document Transition Report	false
Entity Incorporation, State or Country Code	NJ
Entity Tax Identification Number	21-0419870