Segment Information (Additional Product Information For Net Sales) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 29, 2017	Oct. 30, 2016
Segment Reporting Information [Line Items]
Net sales	$ 2,161	$ 2,202
Soup [Member]
Segment Reporting Information [Line Items]
Net sales	807	863
Baked Snacks [Member]
Segment Reporting Information [Line Items]
Net sales	677	653
Other Simple Meals [Member]
Segment Reporting Information [Line Items]
Net sales	435	429
Beverages [Member]
Segment Reporting Information [Line Items]
Net sales	$ 242	$ 257