Goodwill and Purchased Intangible Assets (Schedule Of Goodwill By Reportable Segments) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 27, 2013	Jul. 28, 2012
Goodwill [Roll Forward]
Balance, Beginning	$ 16,998	$ 16,818
Goodwill, Acquired During Period	3,444
Goodwill changes for the period due to other acquisitions	1,469	237
Goodwill, Other Changes	8	(57)
Balance, ending	21,919	16,998
Americas
Goodwill [Roll Forward]
Balance, Beginning	11,755	11,627
Goodwill, Acquired During Period	1,230
Goodwill changes for the period due to other acquisitions	828	136
Goodwill, Other Changes	(13)	(8)
Balance, ending	13,800	11,755
EMEA
Goodwill [Roll Forward]
Balance, Beginning	3,287	3,272
Goodwill, Acquired During Period	1,327
Goodwill changes for the period due to other acquisitions	411	64
Goodwill, Other Changes	12	(49)
Balance, ending	5,037	3,287
APJC
Goodwill [Roll Forward]
Balance, Beginning	1,956	1,919
Goodwill, Acquired During Period	887
Goodwill changes for the period due to other acquisitions	230	37
Goodwill, Other Changes	9	0
Balance, ending	$ 3,082	$ 1,956