Fair Value Measurements Fair Value Measurements Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 29, 2017	Jul. 31, 2016	Jan. 29, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill, Impairment Loss			$ 191
Cash and Cash Equivalents, at Carrying Value	$ 122	$ 74	122
Long-term Debt	2,692	2,755	2,692
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	122	74	122
Long-term Debt, Fair Value	2,747	2,949	2,747
Campbell Fresh [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill, Impairment Loss			$ 191
Campbell Fresh [Member] | Bolthouse Farms carrot and carrot ingredients reporting unit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill, Impairment Loss	127	106
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	20	$ 35
Campbell Fresh [Member] | Garden Fresh Gourmet [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill, Impairment Loss	64
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 1