Goodwill and Purchased Intangible Assets (Schedule Of Goodwill By Reportable Segments) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 25, 2015	Jul. 26, 2014
Goodwill [Roll Forward]
Balance - Beg	$ 24,239	$ 21,919
Balance - End	24,469	24,239
Total acquisitions for the period [Member]
Goodwill [Roll Forward]
Goodwill change for the period	255	2,318
Other
Goodwill [Roll Forward]
Purchase Accounting Adjustments	(25)	2
Americas
Goodwill [Roll Forward]
Balance - Beg	15,080	13,800
Balance - End	15,212	15,080
Americas | Total acquisitions for the period [Member]
Goodwill [Roll Forward]
Goodwill change for the period	145	1,275
Americas | Other
Goodwill [Roll Forward]
Purchase Accounting Adjustments	(13)	5
EMEA
Goodwill [Roll Forward]
Balance - Beg	5,715	5,037
Balance - End	5,791	5,715
EMEA | Total acquisitions for the period [Member]
Goodwill [Roll Forward]
Goodwill change for the period	84	681
EMEA | Other
Goodwill [Roll Forward]
Purchase Accounting Adjustments	(8)	(3)
APJC
Goodwill [Roll Forward]
Balance - Beg	3,444	3,082
Balance - End	3,466	3,444
APJC | Total acquisitions for the period [Member]
Goodwill [Roll Forward]
Goodwill change for the period	26	362
APJC | Other
Goodwill [Roll Forward]
Purchase Accounting Adjustments	$ (4)	$ 0