Income Taxes (Additional Information) (Details) (USD $)	3 Months Ended	6 Months Ended
Jan. 24, 2015	Jan. 24, 2015
Income Tax Disclosure [Abstract]
R&D tax benefit related to FY 2014	$ 91,000,000	$ 91,000,000
Unrecognized Tax Benefits	2,000,000,000us-gaap_UnrecognizedTaxBenefits	2,000,000,000us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1,800,000,000	1,800,000,000
Unrecognized tax benefit that could be reduced in next 12 months	$ 300,000,000	$ 300,000,000

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

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The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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-Publisher FASB

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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