Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Jul. 30, 2017	Apr. 30, 2017	Jan. 29, 2017	Oct. 30, 2016	Jul. 31, 2016	May 01, 2016	Jan. 31, 2016	Nov. 01, 2015	Jul. 30, 2017	Jul. 31, 2016	Aug. 02, 2015
Net sales	$ 1,664	$ 1,853	$ 2,171	$ 2,202	$ 1,687	$ 1,870	$ 2,201	$ 2,203	$ 7,890	$ 7,961	$ 8,082
Gross profit	715	678	825	841	546	660	819	755
Net earnings attributable to Campbell Soup Company	$ 318	$ 176	$ 101	$ 292	$ (81)	$ 185	$ 265	$ 194	$ 887	$ 563	$ 666
Earnings per share, basic	$ 1.05	$ 0.58	$ 0.33	$ 0.95	$ (0.26)	$ 0.60	$ 0.85	$ 0.63	$ 2.91	$ 1.82	$ 2.13
Common Stock, Dividends, Per Share, Declared	0.350	0.350	0.350	0.350	0.312	0.312	0.312	0.312	$ 1.40	$ 1.248	$ 1.248
Taxes on earnings									$ 406	$ 286	$ 283
Earnings Per Share, Diluted	$ 1.04	$ 0.58	$ 0.33	$ 0.94	$ (0.26)	$ 0.59	$ 0.85	$ 0.62	$ 2.89	$ 1.81	$ 2.13
Goodwill and Intangible Asset Impairment, net of tax	$ 0	$ 0	$ 180	$ 0	$ 127	$ 0	$ 0	$ 0
Restructuring charges, implementation costs and other related costs, net of tax	26	4	0	6	7	9	10	23
Pension and postretirement benefits mark to market adj, net of tax	(129)	0	0	13	90	34	(4)	80
Sale of notes, net of tax	$ (56)	$ 0	$ 0	$ 0
Other Income claim settlement, net of tax					$ 0	$ (25)	$ 0	$ 0
Goodwill and Intangible Impairment, Per Diluted Share	$ 0.00	$ 0.00	$ 0.58	$ 0.00	$ 0.41	$ 0.00	$ 0.00	$ 0.00
Restructuring charges, Per Diluted Share	0.09	0.01	0.00	0.02	0.02	0.03	0.03	0.07
Pension and postretirement benefits mark to market adjustment, Per Diluted Share	(0.42)	(0.00)	(0.00)	0.04	0.29	0.11	(0.01)	0.26
Sale of Notes, Per Diluted Share	(0.18)	0.00	0.00	0.00
Other Income claim settlement, Per Diluted Share					(0.00)	(0.08)	(0.00)	(0.00)
Maximum [Member]
Share Price	59.14	64.23	63.50	62.30	67.89	65.48	56.63	52.37	59.14	67.89
Minimum [Member]
Share Price	$ 50.62	$ 56.05	$ 52.59	$ 52.74	$ 59.51	$ 54.97	$ 47.77	$ 45.23	$ 50.62	$ 59.51
Restatement Adjustment [Member]
Taxes on earnings					$ 13
Earnings Per Share, Diluted					$ 0.04