Document and Entity Information Document - shares
3 Months Ended
Oct. 27, 2019
Nov. 25, 2019
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 Oct. 27, 2019  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   301,655,347
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