Supplemental Financial Statement Data (Schedule Of Balance Sheets - Other Assets) (Details) (USD $) In Millions, unless otherwise specified	Jul. 29, 2012	Jul. 31, 2011
Supplemental Financial Statement Data [Abstract]
Fair value of derivatives	$ 10	$ 20
Deferred taxes	49	47
Other Assets, Noncurrent	64	69
Other assets	$ 123	$ 136

The noncurrent portion as of the balance sheet date of the aggregate carrying amount of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; after the valuation allowance, if any, to reduce such amount to net realizable value. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, is classified according to the expected reversal date of the temporary difference.

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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments which are expected to exist longer than one year or beyond the normal operating cycle, if longer, net of the effects of master netting arrangements.

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