Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2022	Aug. 01, 2021	Aug. 02, 2020
Statement of Comprehensive Income [Abstract]
Net earnings	$ 757	$ 1,002	$ 1,628
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax [Abstract]
Foreign currency translation adjustments, before tax	(6)	12	(1)
Reclassification of currency translation adjustments realized upon disposal of business, before tax	0	0	206
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	17	(5)	3
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(12)	8	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract]
Reclassification of prior service credit included in net earnings, before tax	(1)	(5)	(28)
Other comprehensive income (loss), before tax	(2)	10	180
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax [Abstract]
Foreign currency translation adjustments, tax benefit (expense)	0	0	0
Reclassification of currency translation adjustments realized upon disposal of business, tax benefit (expense)	0	0	4
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	3	(1)	1
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	2	(1)	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax [Abstract]
Reclassification of prior service credit included in net earnings, tax (expense) benefit	0	1	6
Other comprehensive income (loss), tax (expense) benefit	(1)	1	9
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Foreign currency translation adjustments, after-tax	(6)	12	(1)
Reclassification of currency translation adjustments realized upon disposal of business, after-tax	0	0	(210)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	14	(4)	2
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	10	(7)	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]
Reclassification of prior service credit included in net earnings, after-tax	(1)	(4)	(22)
Other comprehensive income (loss), after tax	(3)	11	189
Total comprehensive income (loss), after-tax	754	1,013	1,817
Total comprehensive income (loss) attributable to noncontrolling interests	0	(4)	1
Total comprehensive income (loss) attributable to Campbell Soup Company	$ 754	$ 1,017	$ 1,816