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Income Taxes (Income Before Provision For Income Taxes) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 26, 2013	Jan. 28, 2012	Jan. 26, 2013	Jan. 28, 2012
Income Tax Disclosure [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$ 2,780	$ 2,749	$ 5,411	$ 4,994
Income Tax Expense (Benefit)	$ (363)	$ 567	$ 176	$ 1,035
Effective Income Tax Rate, Continuing Operations	(13.10%)	20.60%	3.30%	20.70%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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