Restructuring and Other Charges (Schedule Of Activities Related To Restructuring And Other Charges) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 30, 2016	Jul. 25, 2015	Jul. 26, 2014
Restructuring Reserve [Roll Forward]
Liability as of	$ 89	$ 69	$ 28
Gross charges	268	484	418
Cash payments	(279)	(459)	(352)
Non-cash items	(33)	(5)	(25)
Liability as of	45	89	69
Fiscal 2014 and 2011 Plans | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of	11	40	21
Gross charges	0	0	366
Cash payments	(11)	(29)	(345)
Non-cash items	0	0	(2)
Liability as of	0	11	40
Fiscal 2014 and 2011 Plans | Other
Restructuring Reserve [Roll Forward]
Liability as of	14	29	7
Gross charges	(1)	0	52
Cash payments	(4)	(14)	(7)
Non-cash items	0	(1)	(23)
Liability as of	9	14	29
Fiscal 2015 Plan | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of	49	0	0
Gross charges	225	464	0
Cash payments	(253)	(413)	0
Non-cash items	0	(2)	0
Liability as of	21	49	0
Fiscal 2015 Plan | Other
Restructuring Reserve [Roll Forward]
Liability as of	15	0	0
Gross charges	44	20	0
Cash payments	(11)	(3)	0
Non-cash items	(33)	(2)	0
Liability as of	$ 15	$ 15	$ 0