Acquistions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions					3 Months Ended								4 Months Ended	8 Months Ended	12 Months Ended
		Oct. 30, 2018	Mar. 26, 2018	Dec. 12, 2017	Aug. 02, 2020	Apr. 26, 2020	Jan. 26, 2020	Oct. 27, 2019	Jul. 28, 2019	Apr. 28, 2019	Jan. 27, 2019	Oct. 28, 2018	Jul. 29, 2018	Jul. 29, 2018	Aug. 02, 2020	Jul. 28, 2019	Jul. 29, 2018
Business Acquisition [Line Items]
Goodwill					$ 3,986				$ 4,017				$ 3,864	$ 3,864	$ 3,986	$ 4,017	$ 3,864
Business Combination, Acquisition Related Costs	[1]														0	0	53
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net															(8)	(3)	24
Net sales					$ 2,108	$ 2,238	$ 2,162	$ 2,183	$ 1,780	$ 1,953	$ 2,172	$ 2,202			8,691	8,107	6,615
Net earnings (loss)															$ 1,628	211	261
Snyder's-Lance [Member]
Business Acquisition [Line Items]
Business Acquisition, Share Price			$ 50.00
Payments to Acquire Businesses, Gross			$ 6,112
Goodwill			3,006
Business Combination Transaction and Integration Related Costs																	102
Business Combination, Acquisition Related Costs																	53
Revenue of Acquiree since Acquisition Date, Actual													772
Earnings / (Loss) of Acquiree since Acquisition Date, Actual													$ (84)
Net sales																2,192
Net earnings (loss)																(36)
Snyder's-Lance [Member] | Cost Of Products Sold [Member]
Business Acquisition [Line Items]
Business Combination Amortization of Inventory Fair Value Adjustment																	42
Snyder's-Lance [Member] | Restructuring Charges [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs																	13
Snyder's-Lance [Member] | General and Administrative Expense [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs																	12
Snyder's-Lance [Member] | Interest Expense [Member]
Business Acquisition [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net																	$ 18
Pacific Foods [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross				$ 688
Goodwill				$ 202
Revenue of Acquiree since Acquisition Date, Actual														123
Earnings / (Loss) of Acquiree since Acquisition Date, Actual														$ (13)
Net sales																222
Net earnings (loss)																$ (12)
Yellow Chips [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		$ 18
Payoff of Indebtedness [Member] | Snyder's-Lance [Member]
Business Acquisition [Line Items]
Long-term Debt			$ 1,100
Indefinite-lived Intangible Assets [Member] | Snyder's-Lance [Member]
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles								(134)
Finite-Lived Intangible Assets [Member] | Snyder's-Lance [Member]
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles								(52)
Other Liabilities [Member] | Snyder's-Lance [Member]
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities								(43)
Goodwill [Member] | Snyder's-Lance [Member]
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles								$ 140

[1] In 2018, we recognized transaction costs of $53 related to the acquisition of Snyder's-Lance. See Note 4 for additional information.