Acquistions Acquisitions (Schedule of Purchase Price Allocation) (Details) - USD ($) $ in Millions	Jul. 29, 2018	Mar. 26, 2018	Dec. 12, 2017	Jul. 30, 2017	Jul. 31, 2016
Business Acquisition [Line Items]
Goodwill	$ 4,580			$ 2,115	$ 2,263
Snyder's-Lance [Member]
Business Acquisition [Line Items]
Cash		$ 21
Accounts receivable		221
Inventories		219
Other current assets		32
Plant assets		696
Goodwill		2,866
Other intangible assets		2,947
Other assets		65
Short-term debt		(1)
Accounts payable		(124)
Accrued liabilities		(115)
Deferred incomes taxes		(640)
Other liabilities		(28)
Noncontrolling interest		(47)
Total assets acquired and liabilities assumed		$ 6,112
Pacific Foods [Member]
Business Acquisition [Line Items]
Cash			$ 7
Accounts receivable			16
Inventories			48
Other current assets			1
Plant assets			78
Goodwill			202
Other intangible assets			366
Other assets			0
Short-term debt			0
Accounts payable			(24)
Accrued liabilities			(6)
Deferred incomes taxes			0
Other liabilities			0
Noncontrolling interest			0
Total assets acquired and liabilities assumed			$ 688