Segment Information (Additional Product Information For Net Sales) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 28, 2018	Jan. 29, 2017	Jan. 28, 2018	Jan. 29, 2017
Segment Reporting Information [Line Items]
Net sales	$ 2,180	$ 2,171	$ 4,341	$ 4,373
Soup [Member]
Segment Reporting Information [Line Items]
Net sales	814	831	1,621	1,694
Baked Snacks [Member]
Segment Reporting Information [Line Items]
Net sales	690	661	1,367	1,314
Other Simple Meals [Member]
Segment Reporting Information [Line Items]
Net sales	434	436	869	865
Beverages [Member]
Segment Reporting Information [Line Items]
Net sales	241	243	483	500
Other [Member]
Segment Reporting Information [Line Items]
Net sales	$ 1	$ 0	$ 1	$ 0