Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Aug. 03, 2014		Jul. 28, 2013		Jul. 29, 2012
Statement of Comprehensive Income [Abstract]
Net earnings	$ 807		$ 449		$ 764
Other comprehensive income (loss), before tax [Abstract]
Foreign currency translation adjustments, before tax	(12)		(95)		(127)
Reclassification of currency translation adjustments realized upon disposal of business, before tax	(22)		0		0
Cash-flow hedges, before tax [Abstract]
Unrealized gains (losses) arising during the period, before tax	(12)		20		15
Reclassification adjustment for (gains) losses included in net earnings, before tax	0		4		0
Pension and other postretirement benefits, before tax, [Abstract]
Net actuarial gain (loss) arising during the period, before tax	(55)		322		(428)
Reclassification of prior service credit included in net earnings, before tax	(2)	[1]	(2)	[1]	(1)	[1]
Reclassification of net actuarial loss included in net earnings before tax	113	[1]	124	[1]	83	[1]
Other comprehensive income (loss), before tax	10		373		(458)
Other comprehensive income (loss), tax (expense) benefit [Abstract]
Foreign currency translation adjustments, tax (expense) benefit	(1)		3		(8)
Reclassification of currency translation adjustments realized upon disposal of business, tax (expense) benefit	3		0		0
Cash-flow hedges, tax effect [Abstract]
Unrealized gains (losses) arising during the period, tax (expense) benefit	4		(8)		(5)
Reclassification adjustment for (gains) losses included in net earnings, tax (expense) benefit	0		(1)		0
Pension and other postretirement liability adjustments, tax effect [Abstract]
Net actuarial gain (loss) arising during the period, tax (expense) benefit	20		(103)		151
Reclassification of prior service credit included in net earnings, tax (expense) benefit	0		0		0
Reclassification of net actuarial loss included in net earnings, tax (expense) benefit	(39)		(54)		(29)
Other comprehensive income (loss), tax (expense) benefit	(13)		(163)		109
Other comprehensive income (loss), after-tax [Abstract]
Foreign currency translation adjustments, after-tax	(13)		(92)		(135)
Reclassification of currency translation adjustments realized upon disposal of business, after-tax	(19)		0		0
Cash-flow hedges, after-tax[Abstract]
Unrealized gains (losses) arising during the period, after-tax	(8)		12		10
Reclassification adjustment for (gains) losses included in net earnings, after-tax	0		3		0
Pension and other postretirement liability adjustments, after-tax [Abstract]
Net actuarial gain (loss) arising during the period, after-tax	(35)		219		(277)
Reclassification of prior service credit included in net earnings, after-tax	(2)		(2)		(1)
Reclassification of net actuarial loss included in net earnings, after-tax	74		70		54
Other comprehensive income (loss), after tax	(3)		210		(349)
Total comprehensive income (loss), after-tax	804		659		415
Total comprehensive income (loss) attributable to noncontrolling interests	(10)		(10)		(10)
Total comprehensive income (loss) attributable to Campbell Soup Company	$ 814		$ 669		$ 425

[1] In 2014, net actuarial losses of $2 were recognized in Earnings (loss) from discontinued operations as a result of the sale of the European simple meals business. Excluding the net actuarial losses related to the sale of the business in 2014, these items are included in the components of net periodic benefit costs (see Note 11 for additional details).