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Subsequent Events (Narrative) (Details) (Subsequent Event [Member], Garden Fresh Gourmet [Member], USD $)
In Millions, unless otherwise specified
0 Months Ended
Jun. 09, 2015
Subsequent Event [Member] | Garden Fresh Gourmet [Member]
 
Subsequent Event [Line Items]  
Payments to Acquire Businesses, Gross $ 230us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= cpb_GardenFreshGourmetMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember