Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Oct. 29, 2017	Oct. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 275	$ 292
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax [Abstract]
Foreign currency translation adjustments, before tax	(32)	(8)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Unrealized gains (losses) arising during period, before Tax	9	13
Reclassification adjustment for (gains) losses included in net earnings, before tax	(2)	2
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	(7)	(6)
Other comprehensive income (loss), before tax	(32)	1
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax [Abstract]
Foreign currency translation adjustments, tax (expense) benefit	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract]
Unrealized gains (losses) arising during the period, tax (expense) benefit	(2)	(5)
Reclassification adjustment for (gains) losses 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	2	2
Other comprehensive income (loss), tax (expense) benefit	0	(3)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Foreign currency translation adjustments, after-tax	(32)	(8)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Unrealized gains (losses) arising during the period, after-tax	7	8
Reclassification adjustment for (gains) losses included in net earnings, after-tax	(2)	2
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]
Reclassification of prior service credit included in net earnings, after-tax	(5)	(4)
Other comprehensive income (loss), after tax	(32)	(2)
Total comprehensive income (loss), after-tax	243	290
Total comprehensive income (loss) attributable to noncontrolling interests	0	1
Total comprehensive income (loss) attributable to Campbell Soup Company	$ 243	$ 289