Restructuring Charges and Cost Savings Initiatives (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended				25 Months Ended
		Jul. 29, 2018	Jul. 30, 2017	Jul. 31, 2016	Aug. 02, 2015	Aug. 26, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 62	$ 18	$ 31
Payments to Acquire Property, Plant, and Equipment		407	338	341
Americas Simple Meals and Beverages [Member]
Restructuring Cost and Reserve [Line Items]
Payments to Acquire Property, Plant, and Equipment		187	117	105
Global Biscuits and Snacks [Member]
Restructuring Cost and Reserve [Line Items]
Payments to Acquire Property, Plant, and Equipment		133	127	122
Campbell Fresh [Member]
Restructuring Cost and Reserve [Line Items]
Payments to Acquire Property, Plant, and Equipment		46	47	74
Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Payments to Acquire Property, Plant, and Equipment	[1]	41	47	40
Restructuring and Related Cost, Incurred Cost		136	40	47
2015 Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		49	18	35	$ 102
Payments to Acquire Property, Plant, and Equipment		114
Restructuring and Related Cost, Incurred Cost		$ 185	58	82	124
2015 Initiatives [Member] | Americas Simple Meals and Beverages [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Allocation		45.00%
Restructuring and Related Cost, Incurred Cost		$ 86
2015 Initiatives [Member] | Global Biscuits and Snacks [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Allocation		30.00%
Restructuring and Related Cost, Incurred Cost		$ 73
2015 Initiatives [Member] | Campbell Fresh [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Allocation		3.00%
Restructuring and Related Cost, Incurred Cost		$ 5
2015 Initiatives [Member] | Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Allocation		22.00%
Restructuring and Related Cost, Incurred Cost		$ 21
2015 Initiatives [Member] | Scenario, Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Payments to Acquire Property, Plant, and Equipment						$ 250
2015 Initiatives [Member] | Severance Pay And Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		195
Restructuring and Related Cost, Incurred Cost		43	7	34	87
2015 Initiatives [Member] | Asset Impairment Accelerated Depreciation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		95
Restructuring and Related Cost, Incurred Cost		33	12	0	0
2015 Initiatives [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		570
Effect on Future Cash Flows, Amount		465
2015 Initiatives [Member] | Minimum [Member] | Implementation Costs and Other Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		280
2015 Initiatives [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		605
Effect on Future Cash Flows, Amount		500
2015 Initiatives [Member] | Maximum [Member] | Implementation Costs and Other Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost		315
Snyder's-Lance Cost Transformation Program and Integration [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		13
Restructuring and Related Cost, Incurred Cost		25
Snyder's-Lance Cost Transformation Program and Integration [Member] | Global Biscuits and Snacks [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		25
Snyder's-Lance Cost Transformation Program and Integration [Member] | Severance Pay And Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		13
2014 Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				(4)
2014 Initiatives [Member] | Severance Pay And Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				(4)
2014 Initiatives [Member] | Asset Impairment Accelerated Depreciation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				0
General and Administrative Expense [Member] | 2015 Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		88	$ 36	$ 47	$ 22
General and Administrative Expense [Member] | Snyder's-Lance Cost Transformation Program and Integration [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		$ 12

[1] Represents primarily corporate offices.