Goodwill and Purchased Intangible Assets (Schedule Of Goodwill By Reportable Segments) (Details) (USD $) In Millions, unless otherwise specified				12 Months Ended								12 Months Ended								12 Months Ended								12 Months Ended
	Jul. 26, 2014	Jul. 27, 2013	Jul. 28, 2012	Jul. 26, 2014 Total acquisitions for the period [Member]	Jul. 27, 2013 NDS Group Limited [Member]	Jul. 27, 2013 Other Acquisitions [Member]	Jul. 26, 2014 Other	Jul. 27, 2013 Other	Jul. 26, 2014 Americas	Jul. 27, 2013 Americas	Jul. 28, 2012 Americas	Jul. 26, 2014 Americas Total acquisitions for the period [Member]	Jul. 27, 2013 Americas NDS Group Limited [Member]	Jul. 27, 2013 Americas Other Acquisitions [Member]	Jul. 26, 2014 Americas Other	Jul. 27, 2013 Americas Other	Jul. 26, 2014 EMEA	Jul. 27, 2013 EMEA	Jul. 28, 2012 EMEA	Jul. 26, 2014 EMEA Total acquisitions for the period [Member]	Jul. 27, 2013 EMEA NDS Group Limited [Member]	Jul. 27, 2013 EMEA Other Acquisitions [Member]	Jul. 26, 2014 EMEA Other	Jul. 27, 2013 EMEA Other	Jul. 26, 2014 APJC	Jul. 27, 2013 APJC	Jul. 28, 2012 APJC	Jul. 26, 2014 APJC Total acquisitions for the period [Member]	Jul. 27, 2013 APJC NDS Group Limited [Member]	Jul. 27, 2013 APJC Other Acquisitions [Member]	Jul. 26, 2014 APJC Other	Jul. 27, 2013 APJC Other
Goodwill [Roll Forward]
Balance	$ 24,239	$ 21,919	$ 16,998						$ 15,080	$ 13,800	$ 11,755						$ 5,715	$ 5,037	$ 3,287						$ 3,444	$ 3,082	$ 1,956
Goodwill change for the period				2,318	3,444	1,469						1,275	1,230	828						681	1,327	411						362	887	230
Balance	24,239	21,919	16,998						15,080	13,800	11,755						5,715	5,037	3,287						3,444	3,082	1,956
Goodwill, Translation and Purchase Accounting Adjustments							$ 2	$ 8							$ 5	$ (13)							$ (3)	$ 12							$ 0	$ 9