Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jan. 29, 2017	Jan. 31, 2016	Jan. 29, 2017	Jan. 31, 2016
Statement of Comprehensive Income [Abstract]
Net earnings		$ 101	$ 265	$ 393	$ 459
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax [Abstract]
Foreign currency translation adjustments, before tax		(16)	(17)	(24)	(43)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract]
Unrealized gains (losses) arising during period, before Tax		17	(2)	30	(10)
Reclassification adjustment for (gains) losses included in net earnings, before tax		5	(4)	7	(6)
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]	(7)	(1)	(13)	(1)
Other comprehensive income (loss), before tax		(1)	(24)	0	(60)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax [Abstract]
Foreign currency translation adjustments, tax (expense) benefit		0	0	0	1
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract]
Unrealized gains (losses) arising during the period, tax (expense) benefit		(6)	1	(11)	4
Reclassification adjustment for (gains) losses included in net earnings, tax (expense) benefit		(2)	2	(2)	2
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax [Abstract]
Reclassification of prior service credit included in net earnings, tax (expense) benefit		3	0	5	0
Other comprehensive income (loss), tax (expense) benefit		(5)	3	(8)	7
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [Abstract]
Foreign currency translation adjustments, after-tax		(16)	(17)	(24)	(42)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Unrealized gains (losses) arising during the period, after-tax		11	(1)	19	(6)
Reclassification adjustment for (gains) losses included in net earnings, after-tax		3	(2)	5	(4)
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)	(8)	(1)
Other comprehensive income (loss), after tax		(6)	(21)	(8)	(53)
Total comprehensive income (loss), after-tax		95	244	385	406
Total comprehensive income (loss) attributable to noncontrolling interests		0	2	1	2
Total comprehensive income (loss) attributable to Campbell Soup Company		$ 95	$ 242	$ 384	$ 404

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