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	Jul. 28, 2019	Apr. 28, 2019	Jan. 27, 2019	Oct. 28, 2018	Jul. 29, 2018	Apr. 29, 2018	Jan. 28, 2018	Oct. 29, 2017	Jul. 29, 2018	Jul. 29, 2018	Jul. 28, 2019	Jul. 29, 2018	Jul. 30, 2017
Business Acquisition [Line Items]
Goodwill					$ 4,017				$ 3,864				$ 3,864	$ 3,864	$ 4,017	$ 3,864	$ 811
Business Combination, Acquisition Related Costs	[1]														0	53	0
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net															(3)	24	0
Net sales					$ 1,780	$ 1,953	$ 2,172	$ 2,202	$ 1,745	$ 1,618	$ 1,614	$ 1,638			8,107	6,615	5,837
Net earnings (loss)															211	261	$ 887
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] | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets			756
Snyder's-Lance [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)			1,997
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)
Pacific Foods [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets				$ 86
Finite-Lived Intangible Asset, Useful Life				20 years
Pacific Foods [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)				$ 280
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.