Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Apr. 30, 2017	May 01, 2016	Apr. 30, 2017	May 01, 2016
Statement of Comprehensive Income [Abstract]
Net earnings		$ 176	$ 185	$ 569	$ 644
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax [Abstract]
Foreign currency translation adjustments, before tax		(4)	101	(28)	58
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Unrealized gains (losses) arising during period, before Tax		2	(25)	32	(35)
Reclassification adjustment for (gains) losses included in net earnings, before tax		2	(3)	9	(9)
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	[1]	(5)	(1)	(18)	(2)
Other comprehensive income (loss), before tax		(5)	72	(5)	12
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax [Abstract]
Foreign currency translation adjustments, tax (expense) benefit		0	(1)	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract]
Unrealized gains (losses) arising during the period, tax (expense) benefit		0	7	(11)	11
Reclassification adjustment for (gains) losses included in net earnings, tax (expense) benefit		(1)	1	(3)	3
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax [Abstract]
Reclassification of prior service credit included in net earnings, tax (expense) benefit		1	0	6	0
Other comprehensive income (loss), tax (expense) benefit		0	7	(8)	14
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Foreign currency translation adjustments, after-tax		(4)	100	(28)	58
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Unrealized gains (losses) arising during the period, after-tax		2	(18)	21	(24)
Reclassification adjustment for (gains) losses included in net earnings, after-tax		1	(2)	6	(6)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]
Reclassification of prior service credit included in net earnings, after-tax		(4)	(1)	(12)	(2)
Other comprehensive income (loss), after tax		(5)	79	(13)	26
Total comprehensive income (loss), after-tax		171	264	556	670
Total comprehensive income (loss) attributable to noncontrolling interests		0	0	1	2
Total comprehensive income (loss) attributable to Campbell Soup Company		$ 171	$ 264	$ 555	$ 668

[1] This is included in the components of net periodic benefit (income) / expense (see Note 8 for additional details).