Restructuring Charges and Cost Savings Initiatives (Schedule Of Pre-Tax Charges) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Apr. 26, 2020	Apr. 28, 2019	Apr. 26, 2020	Apr. 28, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		$ 0	$ 2	$ 10	$ 22
2015 and Snyder's-Lance Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		0	2	10	22
Restructuring and Related Cost, Incurred Cost		14	21	50	90
Restructuring and Related Cost, Cost Incurred to Date		622		622
2015 and Snyder's-Lance Initiatives [Member] | Severance Pay And Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost				10
Restructuring and Related Cost, Cost Incurred to Date		215		215
2015 and Snyder's-Lance Initiatives [Member] | Asset Impairment Accelerated Depreciation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost				2
Restructuring and Related Cost, Cost Incurred to Date		65		65
2015 and Snyder's-Lance Initiatives [Member] | Implementation Costs and Other Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date		342		342
2015 and Snyder's-Lance Initiatives [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		0	(1)	0	0
Restructuring and Related Cost, Cost Incurred to Date	[1]	23		23
2015 and Snyder's-Lance Initiatives [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Severance Pay And Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date		19		19
2015 and Snyder's-Lance Initiatives [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Implementation Costs and Other Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date		4		4
2015 and Snyder's-Lance Initiatives [Member] | Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date		239		239
2015 and Snyder's-Lance Initiatives [Member] | General and Administrative Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		10	12	31	35
Restructuring and Related Cost, Cost Incurred to Date		294		294
2015 and Snyder's-Lance Initiatives [Member] | Cost Of Products Sold [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		4	4	6	25
Restructuring and Related Cost, Cost Incurred to Date		73		73
2015 and Snyder's-Lance Initiatives [Member] | Selling and Marketing Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		0	2	2	6
Restructuring and Related Cost, Cost Incurred to Date		12		12
2015 and Snyder's-Lance Initiatives [Member] | Research and Development Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		0	$ 1	1	$ 2
Restructuring and Related Cost, Cost Incurred to Date		$ 4		$ 4

[1] Includes $19 of severance pay and benefits and $4 of implementation costs and other related costs.