Acquistions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended				4 Months Ended	8 Months Ended	12 Months Ended
	Mar. 26, 2018	Dec. 12, 2017	Jul. 29, 2018	Apr. 29, 2018	Jan. 28, 2018	Oct. 29, 2017	Jul. 29, 2018	Jul. 29, 2018	Jul. 29, 2018		Jul. 30, 2017	Jul. 31, 2016
Business Acquisition [Line Items]
Long-term Debt			$ 8,595				$ 8,595	$ 8,595	$ 8,595		$ 2,499
Goodwill			4,580				4,580	4,580	4,580		2,115	$ 2,263
Business Combination, Acquisition Related Costs			$ 8	$ 46	$ 19	$ 0			53	[1]	0	0
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net									24		$ 0	$ (1)
Snyder's-Lance [Member]
Business Acquisition [Line Items]
Business Acquisition, Share Price	$ 50.00
Payments to Acquire Businesses, Gross	$ 6,112
Goodwill	2,866
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)
Snyder's-Lance [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets	808
Snyder's-Lance [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	2,131
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)
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
Payoff of Indebtedness [Member] | Snyder's-Lance [Member]
Business Acquisition [Line Items]
Long-term Debt	$ 1,100

[1] In 2018, we recognized transaction costs of $53 related to the acquisition of Snyder's-Lance. See Note 3 for additional information.