Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 28, 2018	Jan. 29, 2017	Jan. 28, 2018	Jan. 29, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 285	$ 101	$ 560	$ 393
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax [Abstract]
Foreign currency translation adjustments, before tax	66	(16)	34	(24)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Unrealized gains (losses) arising during period, before Tax	2	17	11	30
Reclassification adjustment for (gains) losses included in net earnings, before tax	3	5	1	7
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	(3)	0	(3)	0
Reclassification of prior service credit included in net earnings, before tax	(6)	(7)	(13)	(13)
Other comprehensive income (loss), before tax	62	(1)	30	0
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax [Abstract]
Foreign currency translation adjustments, tax (expense) benefit	0	0	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract]
Unrealized gains (losses) arising during the period, tax (expense) benefit	(2)	(6)	(4)	(11)
Reclassification adjustment for (gains) losses included in net earnings, tax (expense) benefit	0	(2)	0	(2)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Tax	1	0	1	0
Reclassification of prior service credit included in net earnings, tax (expense) benefit	2	3	4	5
Other comprehensive income (loss), tax (expense) benefit	1	(5)	1	(8)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Foreign currency translation adjustments, after-tax	66	(16)	34	(24)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Unrealized gains (losses) arising during the period, after-tax	0	11	7	19
Reclassification adjustment for (gains) losses included in net earnings, after-tax	3	3	1	5
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax	(2)	0	(2)	0
Reclassification of prior service credit included in net earnings, after-tax	(4)	(4)	(9)	(8)
Other comprehensive income (loss), after tax	63	(6)	31	(8)
Total comprehensive income (loss), after-tax	348	95	591	385
Total comprehensive income (loss) attributable to noncontrolling interests	(1)	0	(1)	1
Total comprehensive income (loss) attributable to Campbell Soup Company	$ 349	$ 95	$ 592	$ 384