Goodwill And Intangible Assets (Goodwill) (Details) $ in Millions	9 Months Ended
	Apr. 28, 2019 USD ($)
Goodwill [Line Items]
Beginning Balance	$ 4,580
Goodwill, Purchase Accounting Adjustments	140
Goodwill, Acquired During Period	21
Foreign currency translation adjustment	(39)
Ending Balance	4,702
Meals and Beverages [Member]
Goodwill [Line Items]
Beginning Balance	978
Goodwill, Purchase Accounting Adjustments	0
Goodwill, Acquired During Period	0
Foreign currency translation adjustment	(3)
Ending Balance	975
Global Biscuits and Snacks [Member]
Goodwill [Line Items]
Beginning Balance	3,602
Goodwill, Purchase Accounting Adjustments	140
Goodwill, Acquired During Period	21
Foreign currency translation adjustment	(36)
Ending Balance	$ 3,727