Fair Value Measurements Fair Value Measurements Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 29, 2017	Jul. 31, 2016	Apr. 30, 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		$ 74	24
Long-term Debt		2,755	2,673
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		74	24
Long-term Debt, Fair Value		2,949	2,745
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