Goodwill And Purchased Intangible Assets (Schedule Of Estimated Future Amortization Expense Of Purchased Intangible Assets) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 27, 2012
Disclosure Goodwill And Purchased Intangible Assets Schedule Of Estimated Future Amortization Expense Of Purchased Intangible Assets [Abstract]
2013 (remaining nine months)	$ 702
2014	785
2015	701
2016	474
2017	325
Thereafter	368
Total	$ 3,355