Document and Entity Information Document - USD ($)	12 Months Ended
	Aug. 01, 2021	Sep. 15, 2021	Jan. 29, 2021
Document and Entity Information [Abstract]
Entity Registrant Name	CAMPBELL SOUP COMPANY
Entity Central Index Key	0000016732
Document Type	10-K
Current Fiscal Year End Date	--08-01
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Aug. 01, 2021
Entity File Number	1-3822
Entity Incorporation, State or Country Code	NJ
Entity Tax Identification Number	21-0419870
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	08103-1799
City Area Code	856
Local Phone Number	342-4800
Title of 12(b) Security	Capital Stock, par value $.0375
Trading Symbol	CPB
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Amendment Flag	false
Entity Common Stock, Shares Outstanding		301,517,743
Entity Public Float			$ 9,319,572,891