Goodwill And Purchased Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 31, 2010
Schedule of Goodwill and Purchased Intangible Assets [Line Items]
Goodwill reduction related to pending sale of the Company's manufacturing operations		$ 63
Impairment charges	12	164	28
Amortization of Acquired Intangible Assets	807	1,020	768
Restructuring And Other Charges	304	799
Cost Of Sales
Schedule of Goodwill and Purchased Intangible Assets [Line Items]
Impairment charges		64
Purchased Intangible Assets
Schedule of Goodwill and Purchased Intangible Assets [Line Items]
Amortization of Acquired Intangible Assets		92
Restructuring And Other Charges
Schedule of Goodwill and Purchased Intangible Assets [Line Items]
Restructuring And Other Charges		8
Technology
Schedule of Goodwill and Purchased Intangible Assets [Line Items]
Impairment charges		97
Customer Relationships
Schedule of Goodwill and Purchased Intangible Assets [Line Items]
Impairment charges		40
Other
Schedule of Goodwill and Purchased Intangible Assets [Line Items]
Impairment charges		$ 27