Restructuring and Other Charges (Schedule Of Activities Related To Restructuring And Other Charges) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 28, 2012	Jul. 30, 2011
Restructuring Cost and Reserve [Line Items]
Charges	$ 353	$ 799
Change in estimate	(49)
Cash payments	(436)	(449)
Non-cash items	(20)	(88)
Ending balance	110	262
Voluntary Early Retirement Program
Restructuring Cost and Reserve [Line Items]
Charges		453
Cash payments	(17)	(436)
Ending balance		17
Employee Severance
Restructuring Cost and Reserve [Line Items]
Charges	299	247
Change in estimate	(49)
Cash payments	(401)	(13)
Ending balance	83	234
Goodwill And Intangible Assets
Restructuring Cost and Reserve [Line Items]
Charges		71
Non-cash items		(71)
All Others
Restructuring Cost and Reserve [Line Items]
Charges	54	28
Cash payments	(18)
Non-cash items	(20)	(17)
Ending balance	$ 27	$ 11