Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Jul. 29, 2018	Apr. 29, 2018	Jan. 28, 2018	Oct. 29, 2017	Jul. 30, 2017	Apr. 30, 2017	Jan. 29, 2017	Oct. 30, 2016	Jul. 29, 2018		Jul. 30, 2017	Jul. 31, 2016
Net sales	$ 2,219	$ 2,125	$ 2,180	$ 2,161	$ 1,664	$ 1,853	$ 2,171	$ 2,202	$ 8,685		$ 7,890	$ 7,961
Gross profit	649	618	766	783	598	665	811	851
Net earnings attributable to Campbell Soup Company	$ 94	$ (393)	$ 285	$ 275	$ 318	$ 176	$ 101	$ 292	$ 261		$ 887	$ 563
Earnings per share, basic	$ 0.31	$ (1.31)	$ 0.95	$ 0.91	$ 1.05	$ 0.58	$ 0.33	$ 0.95	$ 0.87		$ 2.91	$ 1.82
Common Stock, Dividends, Per Share, Declared	0.35	0.35	0.35	0.35	0.35	0.35	0.35	0.35	1.40		1.40	1.248
Earnings Per Share, Diluted	$ 0.31	$ (1.31)	$ 0.95	$ 0.91	$ 1.04	$ 0.58	$ 0.33	$ 0.94	$ 0.86		$ 2.89	$ 1.81
Goodwill and Intangible Asset Impairment, net of tax	$ 41	$ 497	$ 74	$ 0	$ 0	$ 0	$ 180	$ 0
Restructuring charges, implementation costs and other related costs, net of tax	33	45	46	12	26	4	0	6
Pension and postretirement benefits mark to market adj, net of tax	(93)	0	0	(9)	(129)	0	0	13
Business Combination, Acquisition Related Costs	8	46	19	0					$ 53	[1]	$ 0	$ 0
Charges Related to Litigation Settlement, net of tax	0	15	0	0
Tax reform	$ (6)	$ 0	$ (124)	$ 0
Sale of Notes Net of Taxes					$ (56)	$ 0	$ 0	$ 0
Goodwill and Intangible Impairment, Per Diluted Share	$ 0.14	$ 1.65	$ 0.25	$ 0.00	$ 0.00	$ 0.00	$ 0.58	$ 0.00
Restructuring charges, Per Diluted Share	0.11	0.15	0.15	0.04	0.09	0.01	0.00	0.02
Pension and postretirement benefits mark to market adjustment, Per Diluted Share	(0.31)	(0.00)	(0.00)	(0.03)	(0.42)	(0.00)	(0.00)	0.04
Business Combination, Acquisition Related Costs Per Diluted Shar	0.03	0.15	0.06	0.00
Charges Related to Litigation Settlement, Per Diluted Share	0.00	0.05	0.00	0.00
Tax Cuts and Jobs Act of 2017, Provisional Income Tax Expense (Benefit), Per Diluted Share	(0.02)	0.00	(0.41)	0.00
Sale of Notes, Per Diluted Share					(0.18)	(0.00)	(0.00)	(0.00)
Maximum [Member]
Share Price	42.88	48.10	51.07	54.37	59.14	64.23	63.50	62.30	$ 42.88		$ 59.14
Minimum [Member]
Share Price	$ 32.63	$ 39.79	$ 45.07	$ 45.00	$ 50.62	$ 56.05	$ 52.59	$ 52.74	$ 32.63		$ 50.62

[1] In 2018, we recognized transaction costs of $53 related to the acquisition of Snyder's-Lance. See Note 3 for additional information.