Goodwill And Purchased Intangible Assets (Scedule Of Goodwill By Reportable Segments) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 26, 2013
Goodwill [Roll Forward]
Balance, beginning	$ 21,919
Acquisitions	1,886
Other	(1)
Balance, ending	23,804
Americas [Member]
Goodwill [Roll Forward]
Balance, beginning	13,800
Acquisitions	1,012
Other	0
Balance, ending	14,812
EMEA
Goodwill [Roll Forward]
Balance, beginning	5,037
Acquisitions	575
Other	(1)
Balance, ending	5,611
APJC
Goodwill [Roll Forward]
Balance, beginning	3,082
Acquisitions	299
Other	0
Balance, ending	$ 3,381