Restructuring and Other Charges (Schedule Of Activities Related To Restructuring And Other Charges) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 27, 2013	Jul. 28, 2012	Jul. 30, 2011
Restructuring Reserve [Roll Forward]
Beginning balance	$ 110	$ 262
Gross charges	105	353	799
Cash payments	(184)	(436)	(449)
Non-cash items	(3)	(20)	(88)
Change in estimate related to fiscal 2011 charges		(49)
Ending balance	28	110	262
Voluntary Early Retirement Program
Restructuring Reserve [Roll Forward]
Beginning balance	0	17
Gross charges	0	0	453
Cash payments	0	(17)	(436)
Ending balance	0	0	17
Employee Severance
Restructuring Reserve [Roll Forward]
Beginning balance	83	234
Gross charges	111	299	247
Cash payments	(173)	(401)	(13)
Change in estimate related to fiscal 2011 charges		(49)
Ending balance	21	83	234
Goodwill And Intangible Assets
Restructuring Reserve [Roll Forward]
Beginning balance	0	0
Gross charges	0	0	71
Non-cash items	0	0	(71)
Ending balance	0	0	0
Other
Restructuring Reserve [Roll Forward]
Beginning balance	27	11
Gross charges	(6)	54	28
Cash payments	(11)	(18)	0
Non-cash items	(3)	(20)	(17)
Ending balance	$ 7	$ 27	$ 11