Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2021	Nov. 01, 2020
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 261	$ 309
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax [Abstract]
Foreign currency translation adjustments, before tax	0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract]
Unrealized gains (losses) arising during the period, before tax	3	(1)
Reclassification adjustment for losses (gains) included in net earnings, before tax	0	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]
Reclassification of prior service credit included in net earnings, before tax	0	(1)
Other comprehensive income (loss), before tax	3	(2)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax [Abstract]
Foreign currency translation adjustments, tax (expense) benefit	0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax [Abstract]
Unrealized gains (losses) arising during the period, tax	(1)	1
Reclassification adjustment for losses (gains) included in net earnings, tax (expense) benefit	0	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	0
Other comprehensive income (loss), tax (expense) benefit	(1)	1
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Foreign currency translation adjustments, after-tax	0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract]
Unrealized gains (loss) arising during the period, after-tax	2	0
Reclassification adjustment for losses (gains) included in net earnings, after-tax	0	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	0	(1)
Other comprehensive income (loss), after-tax	2	(1)
Total comprehensive income (loss), after-tax	263	308
Total comprehensive income (loss) attributable to noncontrolling interests	0	(2)
Total comprehensive income (loss) attributable to Campbell Soup Company	$ 263	$ 310