Restructuring and Other Charges (Schedule Of Activities Related To Restructuring And Other Charges) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 26, 2014	Jul. 27, 2013	Jul. 28, 2012
Restructuring Reserve [Roll Forward]
Liability as of	$ 28	$ 110	$ 262
Gross charges	(418)	(105)	(353)
Change in estimate related to fiscal 2011 charges			(49)
Cash payments	(352)	(184)	(436)
Non-cash items	(25)	(3)	(20)
Liability as of	69	28	110
Fiscal 2011 Plans | Voluntary Early Retirement Program
Restructuring Reserve [Roll Forward]
Liability as of	0	0	17
Gross charges	0		0
Change in estimate related to fiscal 2011 charges			0
Cash payments	0	0	(17)
Non-cash items	0	0	0
Liability as of	0	0	0
Fiscal 2011 Plans | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of	21	83	234
Gross charges	0	(111)	(299)
Change in estimate related to fiscal 2011 charges			(49)
Cash payments	(19)	(173)	(401)
Non-cash items	(2)	0	0
Liability as of	0	21	83
Fiscal 2011 Plans | Other
Restructuring Reserve [Roll Forward]
Liability as of	7	27	11
Gross charges	0	6	(54)
Change in estimate related to fiscal 2011 charges			0
Cash payments	(3)	(11)	(18)
Non-cash items	(1)	(3)	(20)
Liability as of	3	7	27
Fiscal 2014 Plan
Restructuring Reserve [Roll Forward]
Gross charges	(418)
Fiscal 2014 Plan | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of	0	0	0
Gross charges	(366)		0
Change in estimate related to fiscal 2011 charges			0
Cash payments	(326)	0	0
Non-cash items	0	0	0
Liability as of	40	0	0
Fiscal 2014 Plan | Other
Restructuring Reserve [Roll Forward]
Liability as of	0	0	0
Gross charges	(52)		0
Change in estimate related to fiscal 2011 charges			0
Cash payments	(4)	0	0
Non-cash items	(22)	0	0
Liability as of	$ 26	$ 0	$ 0