Goodwill And Intangible Assets (Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	Jul. 28, 2013	Jul. 29, 2012
Finite-Lived Intangible Assets [Line Items]
Non-amortizable intangible assets	$ 810	$ 485
Amortizable intangible assets	228	15
Accumulated amortization	(17)	(4)
Total net intangible assets	1,021	496
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets	156	7
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets	40	0
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets	$ 32	$ 8