Supplemental Financial Statement Data (Other Expenses / (Income)) (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Apr. 29, 2018	Jan. 28, 2018	Apr. 30, 2017	Apr. 29, 2018	Apr. 30, 2017
Amortization of Intangible Assets		$ 10		$ 5	$ 18	$ 15
Intangible asset Impairment charges	[1]	608		0	683	212
Net periodic benefit expense (Income) other than service cost		(23)		(19)	(87)	(33)
(Gain) Loss on Investments		1		2	1	4
Business Acquisition, Transaction Costs	[2]	29		0	53	0
Legal charges		22		0	22	0
Other		0		(3)	(2)	(1)
Goodwill, Impairment Loss					540
Other expenses / (income)		647		$ (15)	688	197
Campbell Fresh [Member]
Goodwill, Impairment Loss					540
Campbell Fresh [Member] | Bolthouse Farms carrot and carrot ingredients reporting unit [Member]
Goodwill, Impairment Loss			$ 75			$ 212
Snyder's-Lance [Member]
Business Acquisition, Transaction Costs		$ 29			$ 53

[1] In the three- and nine-month periods ended April 29, 2018, we recognized impairment charges of $608 related to the intangible assets of the deli reporting unit and the Bolthouse Farms refrigerated beverages and salad dressings reporting unit. The nine-month period ended April 29, 2018, also includes an impairment charge of $75 related to the goodwill of the Bolthouse Farms carrot and carrot ingredients reporting unit. In 2017, we recognized impairment charges of $212 related to the intangible assets of the Bolthouse Farms carrot and carrot ingredients reporting unit and the Garden Fresh Gourmet reporting unit. See Note 5 for additional information.

[2] In the three- and nine-month periods ended April 29, 2018, we recognized transaction costs of $29 and $53, respectively, related to the acquisition of Snyder's-Lance. See Note 3 for additional information.