Restructuring and Other Charges (Schedule Of Activities Related To Restructuring And Other Charges) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 25, 2015	Jul. 26, 2014	Jul. 27, 2013
Restructuring Reserve [Roll Forward]
Liability as of	$ 69	$ 28	$ 110
Gross charges	484	418	105
Cash payments	(459)	(352)	(184)
Non-cash items	(5)	(25)	(3)
Liability as of	89	69	28
Fiscal 2014 and 2011 Plans | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of	40	21	83
Gross charges	0	366	111
Cash payments	(29)	(345)	(173)
Non-cash items	0	(2)	0
Liability as of	11	40	21
Fiscal 2014 and 2011 Plans | Other
Restructuring Reserve [Roll Forward]
Liability as of	29	7	27
Gross charges	0	52
Change in estimate related to fiscal 2011 charges			(6)
Cash payments	(14)	(7)	(11)
Non-cash items	(1)	(23)	(3)
Liability as of	14	29	7
Fiscal 2015 Plan | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of	0	0	0
Gross charges	464		0
Cash payments	(413)	0	0
Non-cash items	(2)	0	0
Liability as of	49	0	0
Fiscal 2015 Plan | Other
Restructuring Reserve [Roll Forward]
Liability as of	0	0	0
Gross charges	20		0
Cash payments	(3)	0	0
Non-cash items	(2)	0	0
Liability as of	$ 15	$ 0	$ 0