Restructuring Charges and Cost Savings Initiatives (Schedule Of Pre-Tax Charges) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jan. 26, 2020	Jan. 27, 2019	Jan. 26, 2020	Jan. 27, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		$ 7	$ 2	$ 10	$ 20
2015 and Snyder's-Lance Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		7	2	10	20
Restructuring and Related Cost, Incurred Cost		25	24	36	69
Restructuring and Related Cost, Cost Incurred to Date		608		608
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		328		328
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	0	0	1
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		13	10	21	23
Restructuring and Related Cost, Cost Incurred to Date		284		284
2015 and Snyder's-Lance Initiatives [Member] | Cost Of Products Sold [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		2	9	2	21
Restructuring and Related Cost, Cost Incurred to Date		69		69
2015 and Snyder's-Lance Initiatives [Member] | Selling and Marketing Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost		2	2	2	4
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		1	$ 1	1	$ 1
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.