Goodwill And Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Jan. 29, 2017	Jul. 31, 2016	Aug. 02, 2015	Jul. 30, 2017	Jul. 31, 2016	Aug. 02, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill, Impairment Loss				$ 191	$ 106
Amortization of Intangible Assets				19	20	$ 17
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months				16
Finite-Lived Intangible Assets, Amortization Expense, Year Two				16
Finite Lived Intangible Assets, Amortization Expense, Year Three				15
Finite Lived Intangible Assets, Amortization Expense, Year Four				15
Finite Lived Intangible Assets, Amortization Expense, Year Five				15
Campbell Fresh [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Impairment Loss				(191)	(106)
Campbell Fresh [Member] | Bolthouse Farms carrot and carrot ingredients reporting unit [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Impairment Loss	$ 127	$ 106
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	20	35
Campbell Fresh [Member] | Bolthouse Farms carrot and carrot ingredients reporting unit [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Fair Value Disclosure	75	202			202
Indefinite-lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure	48	$ 68			68
Campbell Fresh [Member] | Garden Fresh Gourmet [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Impairment Loss	64
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	1
Campbell Fresh [Member] | Garden Fresh Gourmet [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Fair Value Disclosure	52
Indefinite-lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure	$ 37
Global Biscuits and Snacks [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Impairment Loss				$ 0	$ 0
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)			$ 6			$ 6
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life				5 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life				20 years