Goodwill And Intangible Assets (Narrative) (Details) - USD ($) $ in Millions			3 Months Ended		6 Months Ended
		Dec. 12, 2017	Jan. 28, 2018	Jan. 29, 2017	Jan. 28, 2018	Jan. 29, 2017	Jul. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Goodwill	[1]		$ 2,259		$ 2,259		$ 2,115
Goodwill, Impairment Loss					75
Amortization of Intangible Assets			4	$ 5	8	$ 10
Finite-Lived Intangible Assets, Amortization Expense, Current Year			18		18
Finite-Lived Intangible Assets, Amortization Expense, Year Two			20		20
Finite Lived Intangible Assets, Amortization Expense, Year Three			20		20
Finite Lived Intangible Assets, Amortization Expense, Year Four			20		20
Finite Lived Intangible Assets, Amortization Expense, Year Five			19		$ 19
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
Campbell Fresh [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill	[1]		465		$ 465		$ 540
Goodwill, Impairment Loss					75
Campbell Fresh [Member] | Bolthouse Farms carrot and carrot ingredients reporting unit [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Impairment Loss			75		75	$ 212
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure			$ 48		$ 48
Pacific Foods [Member]
Finite-Lived Intangible Assets [Line Items]
Payments To Acquire Business		$ 689
Goodwill		$ 202

[1] The Campbell Fresh segment includes accumulated impairment charges of $372 as of January 28, 2018, and $297 as of July 30, 2017 related to the Bolthouse Farms carrot and carrot ingredients reporting unit and the Garden Fresh Gourmet reporting unit.