Supplemental Financial Statement Data (Other Expenses / (Income)) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 28, 2018	Jan. 29, 2017	Jan. 28, 2018	Jan. 29, 2017
Amortization of Intangible Assets	$ 4	$ 5	$ 8	$ 10
Goodwill and Intangible Asset Impairment	75	212	75	212
Net Periodic Defined Benefits Expense (Income), Excluding Service Cost Component	(22)	(19)	(64)	(14)
(Gain) Loss on Investments	(8)	2	0	2
Business Acquisition, Transaction Costs	24	0	24	0
Other Nonoperating Expense	(3)	1	(2)	2
Goodwill, Impairment Loss			75
Other Nonoperating Income (Expense)	(70)	$ (201)	(41)	(212)
Campbell Fresh [Member]
Goodwill, Impairment Loss			75
Campbell Fresh [Member] | Bolthouse Farms carrot and carrot ingredients reporting unit [Member]
Goodwill, Impairment Loss	75		75	$ 212
Snyder's-Lance [Member]
Business Acquisition, Transaction Costs	$ 24		$ 24