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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 6 Months Ended
Feb. 01, 2015
Jan. 26, 2014
Feb. 01, 2015
Jan. 26, 2014
Segment Reporting Information [Line Items]        
Net sales $ 2,234us-gaap_SalesRevenueGoodsNet $ 2,281us-gaap_SalesRevenueGoodsNet $ 4,489us-gaap_SalesRevenueGoodsNet $ 4,446us-gaap_SalesRevenueGoodsNet
Simple Meals [Member]        
Segment Reporting Information [Line Items]        
Net sales 1,290us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_SimpleMealsMember		 1,329us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_SimpleMealsMember		 2,601us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_SimpleMealsMember		 2,563us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_SimpleMealsMember
Baked Snacks [Member]        
Segment Reporting Information [Line Items]        
Net sales 669us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_BakedSnacksMember		 670us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_BakedSnacksMember		 1,332us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_BakedSnacksMember		 1,315us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_BakedSnacksMember
Beverages [Member]        
Segment Reporting Information [Line Items]        
Net sales $ 275us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_BeveragesMember		 $ 282us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_BeveragesMember		 $ 556us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_BeveragesMember		 $ 568us-gaap_SalesRevenueGoodsNet
/ us-gaap_ProductOrServiceAxis
= cpb_BeveragesMember