Restructuring Charges and Cost Savings Initiatives (Schedule Of Restructuring Charges Associated With Each Reportable Segment) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
		Jan. 27, 2019	Jan. 28, 2018	Jan. 27, 2019	Jan. 28, 2018	Jul. 29, 2018
Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		$ 22	$ 27	$ 49	$ 44
2015 and Snyder's-Lance Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		24	$ 60	70	$ 79
Restructuring and Related Cost, Cost Incurred to Date	[1]	544		544
2015 and Snyder's-Lance Initiatives [Member] | Meals and Beverages [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		12		35
Restructuring and Related Cost, Cost Incurred to Date		213		213
2015 and Snyder's-Lance Initiatives [Member] | Global Biscuits and Snacks [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		7		16
Restructuring and Related Cost, Cost Incurred to Date	[2]	192		192
2015 and Snyder's-Lance Initiatives [Member] | Campbell Fresh [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		0		3
Restructuring and Related Cost, Cost Incurred to Date		14		14
2015 and Snyder's-Lance Initiatives [Member] | Corporate, Non-Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		5		16
Restructuring and Related Cost, Cost Incurred to Date		$ 125		$ 125
Snyder's-Lance Cost Transformation Program and Integration [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost						$ 13
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

[1] Includes $13 of Restructuring charges and $12 of Administrative expenses associated with the Snyder's-Lance cost transformation program and integration recognized in 2018.

[2] Includes $25 of pre-tax costs associated with the Global Biscuits and Snacks segment recognized in 2018 related to the Snyder's-Lance cost transformation program and integration.