Recent Accounting Pronouncements Schedule of Changes (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 29, 2017	Oct. 30, 2016
Cost of products sold	$ 1,378	$ 1,351
Marketing and selling expenses	219	230
Administrative expenses	149	125
Research and development expenses	30	27
Other expenses / (income)	$ 29	(11)
Accounting Standards Update 2017-07 [Member]
Cost of products sold		(10)
Marketing and selling expenses		2
Administrative expenses		2
Research and development expenses		1
Other expenses / (income)		$ (5)