Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Jul. 28, 2024	Jul. 30, 2023	Jul. 31, 2022
Statement of Comprehensive Income [Abstract]
Net earnings	$ 567	$ 858	$ 757
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax [Abstract]
Foreign currency translation adjustments, before tax	(9)	(1)	(6)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract]
Unrealized gains (losses) arising during the period, before tax	(5)	5	17
Reclassification adjustment for losses (gains) included in net earnings, before tax	(1)	(10)	(12)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract]
Reclassification of prior service credit included in net earnings, before tax	0	0	(1)
Other comprehensive income (loss), before tax	(15)	(6)	(2)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax [Abstract]
Foreign currency translation adjustments, tax benefit (expense)	0	0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax [Abstract]
Unrealized gains (losses) arising during the period, tax benefit (expense)	1	(1)	(3)
Reclassification adjustment for losses (gains) included in net earnings, tax benefit (expense)	0	2	2
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax [Abstract]
Reclassification of prior service credit included in net earnings, tax benefit (expense)	0	0	0
Other comprehensive income (loss), tax benefit (expense)	1	1	(1)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Foreign currency translation adjustments, after-tax	(9)	(1)	(6)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract]
Unrealized gains (losses) arising during the period, after-tax	(4)	4	14
Reclassification adjustment for losses (gains) included in net earnings, after-tax	(1)	(8)	(10)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]
Reclassification of prior service credit included in net earnings, after-tax	0	0	(1)
Other comprehensive income (loss), after-tax	(14)	(5)	(3)
Total comprehensive income (loss), after-tax	553	853	754
Total comprehensive income (loss) attributable to noncontrolling interests	0	0	0
Total comprehensive income (loss) attributable to Campbell Soup Company	$ 553	$ 853	$ 754