Acquistions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended		9 Months Ended
		Mar. 26, 2018	Dec. 12, 2017	Apr. 29, 2018	Apr. 30, 2017	Apr. 29, 2018	Apr. 30, 2017	Jul. 30, 2017
Business Acquisition [Line Items]
Long-term Debt				$ 8,593		$ 8,593		$ 2,499
Goodwill	[1]			4,608		4,608		$ 2,115
Business Acquisition, Transaction Costs	[2]			29	$ 0	53	$ 0
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net				16	$ (3)	23	6
Snyder's-Lance [Member]
Business Acquisition [Line Items]
Business Acquisition, Share Price		$ 50.00
Payments To Acquire Business		$ 6,112
Goodwill		2,867
Business Combination Transaction and Integration Related Costs				64		88
Business Acquisition, Transaction Costs				29		53
Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual				207		207
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual				(52)
Snyder's-Lance [Member] | Cost Of Products Sold [Member]
Business Acquisition [Line Items]
Business Combination Amortization of Inventory Fair Value Adjustment				37		37
Snyder's-Lance [Member] | Restructuring Charges [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs				10		10
Snyder's-Lance [Member] | Administrative expenses [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs				6		6
Snyder's-Lance [Member] | Interest Expense [Member]
Business Acquisition [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net				18		18
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
Pacific Foods [Member]
Business Acquisition [Line Items]
Payments To Acquire Business			$ 689
Goodwill			202
Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual				$ 55		$ 83
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
Pro Forma [Member] | Snyder's-Lance [Member]
Business Acquisition [Line Items]
Business Acquisition, Transaction Costs							53
Pro Forma [Member] | Snyder's-Lance [Member] | Cost Of Products Sold [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs							42
Pro Forma [Member] | Snyder's-Lance [Member] | Interest Expense [Member]
Business Acquisition [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net							$ 18
Payoff of Indebtedness [Member] | Snyder's-Lance [Member]
Business Acquisition [Line Items]
Long-term Debt		$ 1,100

[1] The Campbell Fresh segment includes accumulated impairment charges of $837 as of April 29, 2018, and $297 as of July 30, 2017 related to the Bolthouse Farms carrot and carrot ingredients reporting unit, the deli reporting unit, and the Bolthouse Farms refrigerated beverages and salad dressings reporting unit.

[2] In the three- and nine-month periods ended April 29, 2018, we recognized transaction costs of $29 and $53, respectively, related to the acquisition of Snyder's-Lance. See Note 3 for additional information.