Basis of Presentation and Significant Accounting Polices (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	May. 01, 2016	May. 03, 2015	May. 01, 2016	May. 03, 2015	Aug. 02, 2015	Aug. 04, 2014
Cost of products sold	$ 1,210	$ 1,218	$ 4,040	$ 4,169
Marketing and selling expenses	228	213	677	695
Administrative expenses	154	142	456	408
Research and development expenses	31	30	86	83
Earnings before interest and taxes	268	285	997	1,011
Earnings before taxes	240	257	914	933
Taxes on earnings	55	78	270	284
Net earnings	185	179	644	649
Net earnings attributable to Campbell Soup Company	$ 185	$ 179	$ 644	$ 649
Earnings Per Share, Basic	$ 0.60	$ 0.58	$ 2.08	$ 2.07
Earnings Per Share, Diluted	$ 0.59	$ 0.57	$ 2.07	$ 2.07
Foreign currency translation adjustments, before tax	$ 101	$ 9	$ 58	$ (229)
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	829		829		$ 995
Other current assets	182		182		198
Accrued income taxes	54		54		29
Earnings retained in the business	2,105		2,105		1,754
Accumulated other comprehensive loss	(144)		(144)		(168)
Pension and postretirement benefit expense/(income)			167	9
Deferred income taxes			4	28
Other, net			2	15
Inventories			172	109
Accounts payable and accrued liabilities			(87)	(110)
Net cash provided by operating activities			1,183	971
Prior accounting principles [Member]
Cost of products sold	1,195		4,011
Marketing and selling expenses	223		672
Administrative expenses	151		454
Research and development expenses	30		85
Earnings before interest and taxes	292		1,034
Earnings before taxes	264		951
Taxes on earnings	63		281
Net earnings	201		670
Net earnings attributable to Campbell Soup Company	$ 201		$ 670
Earnings Per Share, Basic	$ 0.65		$ 2.17
Earnings Per Share, Diluted	$ 0.65		$ 2.15
Foreign currency translation adjustments, before tax	$ 101		$ 58
Net actuarial gain (loss) arising during the period, before tax	(68)		(181)
Reclassification of net actuarial loss included in net earnings	35		144
Tax benefit/(expense)	12		14
Inventories	827		827
Other current assets	183		183
Accrued income taxes	51		51
Earnings retained in the business	2,871		2,871
Accumulated other comprehensive loss	(908)		(908)
Pension and postretirement benefit expense/(income)			0
Deferred income taxes			18
Other, net			132
Inventories			172
Accounts payable and accrued liabilities			(90)
Net cash provided by operating activities			1,183
Previously reported [Member]
Cost of products sold		1,218		4,196
Marketing and selling expenses		213		702
Administrative expenses		141		416
Research and development expenses		29		85
Earnings before interest and taxes		287		967
Earnings before taxes		259		889
Taxes on earnings		77		266
Net earnings		182		623
Net earnings attributable to Campbell Soup Company		$ 182		$ 623
Earnings Per Share, Basic		$ 0.59		$ 1.99
Earnings Per Share, Diluted		$ 0.58		$ 1.98
Foreign currency translation adjustments, before tax		$ 12		$ (238)
Net actuarial gain (loss) arising during the period, before tax		(4)		13
Reclassification of net actuarial loss included in net earnings		24		72
Tax benefit/(expense)		(7)		(29)
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				12
Other, net				69
Inventories				108
Accounts payable and accrued liabilities				(112)
Net cash provided by operating activities				971
Restatement adjustment [Member]
Cost of products sold	15	0	29	(27)
Marketing and selling expenses	5	0	5	(7)
Administrative expenses	3	1	2	(8)
Research and development expenses	1	1	1	(2)
Earnings before interest and taxes	(24)	(2)	(37)	44
Earnings before taxes	(24)	(2)	(37)	44
Taxes on earnings	(8)	1	(11)	18
Net earnings	(16)	(3)	(26)	26
Net earnings attributable to Campbell Soup Company	$ (16)	$ (3)	$ (26)	$ 26
Earnings Per Share, Basic	$ (0.05)	$ (0.01)	$ (0.08)	$ 0.08
Earnings Per Share, Diluted	$ (0.05)	$ (0.01)	$ (0.08)	$ 0.08
Foreign currency translation adjustments, before tax	$ 0	$ (3)	$ 0	$ 9
Net actuarial gain (loss) arising during the period, before tax	68	4	181	(13)
Reclassification of net actuarial loss included in net earnings	(35)	(24)	(144)	(72)
Tax benefit/(expense)	(12)	$ 7	(14)	29
Inventories	2		2		2	$ (2)
Other current assets	(1)		(1)		(1)	1
Accrued income taxes	3		3		0
Earnings retained in the business	(766)		(766)		(740)	(715)
Accumulated other comprehensive loss	$ 764		764		$ 741	$ 714
Pension and postretirement benefit expense/(income)			167	9
Deferred income taxes			(14)	16
Other, net			(130)	(54)
Inventories			0	1
Accounts payable and accrued liabilities			3	2
Net cash provided by operating activities			$ 0	$ 0