Acquistions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended			6 Months Ended
		Dec. 12, 2017	Apr. 29, 2018	Jan. 28, 2018	Jan. 29, 2017	Jan. 28, 2018	Jan. 29, 2017	Dec. 18, 2017	Jul. 30, 2017
Business Acquisition [Line Items]
Business Acquisition, Transaction Costs				$ 24	$ 0	$ 24	$ 0
Goodwill	[1]			2,259		2,259			$ 2,115
Pacific Foods [Member]
Business Acquisition [Line Items]
Payments To Acquire Business		$ 689
Goodwill		202
Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual				28
Pacific Foods [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets		$ 86
Finite-Lived Intangible Asset, Useful Life		20 years
Pacific Foods [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)		$ 280
Snyder's-Lance [Member]
Business Acquisition [Line Items]
Business Acquisition, Transaction Costs				$ 24		$ 24
Snyder's-Lance [Member] | Scenario, Forecast [Member]
Business Acquisition [Line Items]
Business Acquisition, Share Price			$ 50.00
Expected Debt to Finance Acquisition			$ 6,200
Snyder's-Lance [Member] | Bridge Loan [Member]
Business Acquisition [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity								$ 6,200
Snyder's-Lance [Member] | Bridge Loan [Member] | Scenario, Forecast [Member]
Business Acquisition [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 5,000
Debt Instrument, Term			364 days
Snyder's-Lance [Member] | Term Loan [Member] | Scenario, Forecast [Member]
Business Acquisition [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,200

[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.