Business Combinations (Summary Of Allocation Of Total Purchase Consideration) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jan. 24, 2015
Business Acquisition [Line Items]
Purchase Consideration	$ 220
Net Liabilities Assumed	(17)
Purchased Intangible Assets	69
Goodwill	168us-gaap_GoodwillGross
Metacloud, Inc.
Business Acquisition [Line Items]
Purchase Consideration	149
Net Liabilities Assumed	(7)
Purchased Intangible Assets	29
Goodwill	127
All others (two in total)
Business Acquisition [Line Items]
Purchase Consideration	71
Net Liabilities Assumed	(10)
Purchased Intangible Assets	40
Goodwill	$ 41

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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