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Business And Geographic Segment Information (Additional Product Information For Net Sales) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
May 03, 2015
Apr. 27, 2014
May 03, 2015
Apr. 27, 2014
Segment Reporting Information [Line Items]        
Net sales $ 1,900us-gaap_SalesRevenueGoodsNet $ 1,970us-gaap_SalesRevenueGoodsNet $ 6,389us-gaap_SalesRevenueGoodsNet $ 6,416us-gaap_SalesRevenueGoodsNet
Simple Meals [Member]        
Segment Reporting Information [Line Items]        
Net sales 1,011us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_SimpleMealsMember		 1,063us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_SimpleMealsMember		 3,612us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_SimpleMealsMember		 3,626us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_SimpleMealsMember
Baked Snacks [Member]        
Segment Reporting Information [Line Items]        
Net sales 587us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_BakedSnacksMember		 597us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_BakedSnacksMember		 1,919us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_BakedSnacksMember		 1,912us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_BakedSnacksMember
Beverages [Member]        
Segment Reporting Information [Line Items]        
Net sales $ 302us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_BeveragesMember		 $ 310us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_BeveragesMember		 $ 858us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_BeveragesMember		 $ 878us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_BeveragesMember