Recent Accounting Pronouncements Schedule of Changes (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 30, 2017	Jul. 31, 2016	Aug. 02, 2015
Cost of products sold	$ 4,831	$ 5,181	$ 5,300
Marketing and selling expenses	817	893	884
Administrative expenses	488	641	601
Research and development expenses	98	124	117
Other Operating Income (Expense), Net	(238)	(131)	(24)
Accounting Standards Update 2017-07 [Member]
Cost of products sold	134	(148)	(42)
Marketing and selling expenses	38	(41)	(12)
Administrative expenses	62	(66)	(21)
Research and development expenses	13	(19)	(8)
Other Operating Income (Expense), Net	$ 247	$ (274)	$ (83)