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Acquistions (Narrative) (Details) (Kelsen [Member], USD $)
In Millions, unless otherwise specified
0 Months Ended 3 Months Ended 9 Months Ended
Aug. 08, 2013
Apr. 27, 2014
Apr. 27, 2014
Kelsen [Member]
     
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross $ 331us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= cpb_KelsenMember
   
Number of Countries in which Entity Operates 85us-gaap_NumberOfCountriesInWhichEntityOperates
/ us-gaap_BusinessAcquisitionAxis
= cpb_KelsenMember
   
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual   17us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= cpb_KelsenMember
161us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= cpb_KelsenMember
Business Combination, Pro Forma Information, Earnings or (Loss) of Acquiree since Acquisition Date, Actual   $ (4)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= cpb_KelsenMember
$ 7us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= cpb_KelsenMember