Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jan. 31, 2021	Jan. 26, 2020	Jan. 31, 2021	Jan. 26, 2020
Income Statement [Abstract]
Net sales		$ 2,279	$ 2,162	$ 4,619	$ 4,345
Costs and expenses
Cost of products sold		1,496	1,420	3,023	2,865
Marketing and selling expenses		232	237	440	443
Administrative expenses		158	148	299	282
Research and development expenses		19	22	39	44
Other expenses / (income)		(45)	(22)	(63)	34
Restructuring charges		18	7	19	10
Total costs and expenses		1,878	1,812	3,757	3,678
Earnings before interest and taxes		401	350	862	667
Interest expense		55	149	110	229
Interest income		1	3	1	3
Earnings before taxes		347	204	753	441
Taxes on earnings		102	33	199	101
Earnings from continuing operations		245	171	554	340
Earnings from discontinued operations		0	1,037	0	1,034
Net earnings		245	1,208	554	1,374
Less: Net earnings (loss) attributable to noncontrolling interests		0	0	0	0
Net earnings attributable to Campbell Soup Company		$ 245	$ 1,208	$ 554	$ 1,374
Per Share - Basic
Earnings from continuing operations attributable to Campbell Soup Company		$ 0.81	$ 0.57	$ 1.83	$ 1.13
Earnings from discontinued operations		0	3.43	0	3.44
Net earnings attributable to Campbell Soup Company	[1]	$ 0.81	$ 4.00	$ 1.83	$ 4.56
Weighted average shares outstanding - basic		303	302	303	301
Per Share - Assuming Dilution
Earnings from continuing operations attributable to Campbell Soup Company		$ 0.80	$ 0.56	$ 1.82	$ 1.12
Earnings from discontinued operations		0	3.41	0	3.41
Net earnings attributable to Campbell Soup Company		$ 0.80	$ 3.97	$ 1.82	$ 4.53
Weighted average shares outstanding - assuming dilution		305	304	305	303

[1] Sum of the individual amounts may not add due to rounding.