Fair Value Measurements Fair Value Measurements Narrative (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Jul. 30, 2017	Jan. 29, 2017	Jul. 31, 2016	Jul. 30, 2017	Jul. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges	$ 12
Goodwill, Impairment Loss				$ 191	$ 106
Cash and Cash Equivalents, at Carrying Value	8		$ 74	8	74
Long-term Debt	2,499		2,755	2,499	2,755
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	8		74	8	74
Long-term Debt, Fair Value	$ 2,582		2,949	2,582	2,949
Campbell Fresh [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill, Impairment Loss				$ (191)	$ (106)
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