Basis of Presentation and Significant Accounting Polices (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jan. 31, 2016	Feb. 01, 2015	Jan. 31, 2016	Feb. 01, 2015	Aug. 02, 2015	Aug. 04, 2014
Cost of products sold	$ 1,382	$ 1,491	$ 2,830	$ 2,951
Marketing and selling expenses	223	239	449	482
Administrative expenses	146	135	302	266
Research and development expenses	23	25	55	53
Earnings before interest and taxes	414	337	729	726
Earnings before taxes	387	312	674	676
Taxes on earnings	122	90	215	206
Net earnings	265	222	459	470
Net earnings attributable to Campbell Soup Company	$ 265	$ 222	$ 459	$ 470
Earnings Per Share, Basic	$ 0.85	$ 0.71	$ 1.48	$ 1.50
Earnings Per Share, Diluted	$ 0.85	$ 0.71	$ 1.47	$ 1.50
Foreign currency translation adjustments, before tax	$ (17)	$ (157)	$ (43)	$ (238)
Net actuarial gain (loss) arising during the period, before tax	0	0	0	0
Reclassification of net actuarial loss included in net earnings	0	0	0	0
Tax benefit/(expense)	0	0	0	0
Inventories	855		855		$ 995
Other current assets	201		201		198
Accrued income taxes	75		75		29
Earnings retained in the business	2,017		2,017		1,754
Accumulated other comprehensive loss	(223)		(223)		(168)
Pension and postretirement benefit expense/(income)			109	(12)
Deferred income taxes			(14)	18
Other, net			4	10
Inventories			133	73
Accounts payable and accrued liabilities			(30)	(16)
Net cash provided by operating activities			727	584
Prior accounting principles [Member]
Cost of products sold	1,404		2,816
Marketing and selling expenses	233		449
Administrative expenses	154		303
Research and development expenses	26		55
Earnings before interest and taxes	371		742
Earnings before taxes	344		687
Taxes on earnings	108		218
Net earnings	236		469
Net earnings attributable to Campbell Soup Company	$ 236		$ 469
Earnings Per Share, Basic	$ 0.76		$ 1.51
Earnings Per Share, Diluted	$ 0.76		$ 1.50
Foreign currency translation adjustments, before tax	$ (17)		$ (43)
Net actuarial gain (loss) arising during the period, before tax	23		(113)
Reclassification of net actuarial loss included in net earnings	32		109
Tax benefit/(expense)	(20)		2
Inventories	862		862
Other current assets	199		199
Accrued income taxes	73		73
Earnings retained in the business	2,767		2,767
Accumulated other comprehensive loss	(966)		(966)
Pension and postretirement benefit expense/(income)			0
Deferred income taxes			(9)
Other, net			109
Inventories			124
Accounts payable and accrued liabilities			(32)
Net cash provided by operating activities			727
Previously reported [Member]
Cost of products sold		1,506		2,978
Marketing and selling expenses		242		489
Administrative expenses		140		275
Research and development expenses		27		56
Earnings before interest and taxes		312		680
Earnings before taxes		287		630
Taxes on earnings		80		189
Net earnings		207		441
Net earnings attributable to Campbell Soup Company		$ 207		$ 441
Earnings Per Share, Basic		$ 0.66		$ 1.41
Earnings Per Share, Diluted		$ 0.66		$ 1.40
Foreign currency translation adjustments, before tax		$ (167)		$ (250)
Net actuarial gain (loss) arising during the period, before tax		13		17
Reclassification of net actuarial loss included in net earnings		24		48
Tax benefit/(expense)		(12)		(22)
Inventories					993
Other current assets					199
Accrued income taxes					29
Earnings retained in the business					2,494
Accumulated other comprehensive loss					(909)
Pension and postretirement benefit expense/(income)				0
Deferred income taxes				1
Other, net				46
Inventories				71
Accounts payable and accrued liabilities				(16)
Net cash provided by operating activities				584
Restatement adjustment [Member]
Cost of products sold	(22)	(15)	14	(27)
Marketing and selling expenses	(10)	(3)	0	(7)
Administrative expenses	(8)	(5)	(1)	(9)
Research and development expenses	(3)	(2)	0	(3)
Earnings before interest and taxes	43	25	(13)	46
Earnings before taxes	43	25	(13)	46
Taxes on earnings	14	10	(3)	17
Net earnings	29	15	(10)	29
Net earnings attributable to Campbell Soup Company	$ 29	$ 15	$ (10)	$ 29
Earnings Per Share, Basic	$ 0.09	$ 0.05	$ (0.03)	$ 0.09
Earnings Per Share, Diluted	$ 0.09	$ 0.05	$ (0.03)	$ 0.09
Foreign currency translation adjustments, before tax	$ 0	$ 10	$ 0	$ 12
Net actuarial gain (loss) arising during the period, before tax	(23)	(13)	113	(17)
Reclassification of net actuarial loss included in net earnings	(32)	(24)	(109)	(48)
Tax benefit/(expense)	20	$ 12	(2)	22
Inventories	(7)		(7)		2	$ (2)
Other current assets	2		2		(1)	1
Accrued income taxes	2		2		0
Earnings retained in the business	(750)		(750)		(740)	(715)
Accumulated other comprehensive loss	$ 743		743		$ 741	$ 714
Pension and postretirement benefit expense/(income)			109	(12)
Deferred income taxes			(5)	17
Other, net			(105)	(36)
Inventories			9	2
Accounts payable and accrued liabilities			2	0
Net cash provided by operating activities			$ 0	$ 0