Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Schecule of amounts reclassified from AOCI) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		May 02, 2021	Aug. 01, 2021	Aug. 02, 2020	Jul. 28, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of products sold			$ 5,665	$ 5,692	$ 5,414
Other expenses / (income)			(254)	221	140
Earnings (loss) from discontinued operations		$ (6)	(6)	1,036	(263)
Interest expense	[1]		210	345	356
Taxes on earnings			328	174	151
Net earnings attributable to Campbell Soup Company			(1,002)	(1,628)	(211)
Accumulated Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other expenses / (income)			0	23	0
Earnings (loss) from discontinued operations			0	(183)	(2)
Earnings before taxes			0	206	2
Taxes on earnings			0	4	0
Net earnings attributable to Campbell Soup Company			0	210	2
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Earnings before taxes			8	0	0
Taxes on earnings			(1)	0	0
Net earnings attributable to Campbell Soup Company			7	0	0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign Exchange Contract [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of products sold			6	(2)	(4)
Other expenses / (income)			1	0	0
Earnings (loss) from discontinued operations			0	(1)	(2)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Rate Contract [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest expense			1	1	2
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other expenses / (income)			(5)	(28)	(28)
Taxes on earnings			1	6	7
Net earnings attributable to Campbell Soup Company			$ (4)	$ (22)	$ (21)

[1] In 2020, we recognized a loss of $75 (including $65 of premium, fees and other costs paid with the tender offers and unamortized debt issuance costs). See Note 12 for additional information.