Business And Geographic Segment Information (Additional Product Information For Net Sales) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Aug. 02, 2020	Apr. 26, 2020	Jan. 26, 2020	Oct. 27, 2019	Jul. 28, 2019	Apr. 28, 2019	Jan. 27, 2019	Oct. 28, 2018	Aug. 02, 2020	Jul. 28, 2019	Jul. 29, 2018
Segment Reporting Information [Line Items]
Net sales	$ 2,108	$ 2,238	$ 2,162	$ 2,183	$ 1,780	$ 1,953	$ 2,172	$ 2,202	$ 8,691	$ 8,107	$ 6,615
Soup [Member]
Segment Reporting Information [Line Items]
Net sales									2,653	2,368	2,355
Snacks [Member]
Segment Reporting Information [Line Items]
Net sales									4,099	3,918	2,438
Other Simple Meals [Member]
Segment Reporting Information [Line Items]
Net sales									1,184	1,082	1,108
Beverages [Member]
Segment Reporting Information [Line Items]
Net sales									755	738	711
Other [Member]
Segment Reporting Information [Line Items]
Net sales									$ 0	$ 1	$ 3