Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jan. 26, 2020	Jan. 27, 2019	Jan. 26, 2020	Jan. 27, 2019
Income Statement [Abstract]
Net sales		$ 2,162	$ 2,172	$ 4,345	$ 4,374
Costs and expenses
Cost of products sold		1,420	1,466	2,865	2,942
Marketing and selling expenses		237	221	443	432
Administrative expenses		148	146	282	294
Research and development expenses		22	20	44	43
Other expenses / (income)		(22)	(8)	34	(8)
Restructuring charges		7	2	10	20
Total costs and expenses		1,812	1,847	3,678	3,723
Earnings before interest and taxes		350	325	667	651
Interest expense		149	91	229	182
Interest income		3	0	3	1
Earnings before taxes		204	234	441	470
Taxes on earnings		33	58	101	114
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total		171	176	340	356
Earnings (loss) from discontinued operations		1,037	(235)	1,034	(221)
Net earnings (loss)		1,208	(59)	1,374	135
Less: Net earnings (loss) attributable to noncontrolling interests		0	0	0	0
Net earnings (loss) attributable to Campbell Soup Company		$ 1,208	$ (59)	$ 1,374	$ 135
Per Share - Basic
Earnings from continuing operations attributable to Campbell Soup Company		$ 0.57	$ 0.58	$ 1.13	$ 1.18
Earnings (loss) from discontinued operations		3.43	(0.78)	3.44	(0.73)
Net earnings (loss) attributable to Campbell Soup Company	[1]	$ 4.00	$ (0.20)	$ 4.56	$ 0.45
Weighted average shares outstanding - basic		302	301	301	301
Per Share - Assuming Dilution
Earnings from continuing operations attributable to Campbell Soup Company		$ 0.56	$ 0.58	$ 1.12	$ 1.18
Earnings (loss) from discontinued operations		3.41	(0.78)	3.41	(0.73)
Net earnings (loss) attributable to Campbell Soup Company		$ 3.97	$ (0.20)	$ 4.53	$ 0.45
Weighted average shares outstanding - assuming dilution		304	302	303	302

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