v2.4.0.8

Restructuring And Other Charges (Additional Information) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 26, 2013	Oct. 27, 2012
August Fiscal 2014 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected Number of Positions Eliminated (headcounts)	4,000
Restructuring, position eliminated of total positions, percent	5.00%
Restructuring and Related Cost, Cost Incurred to Date	$ 237
Restructuring and Related Cost, Expected Cost	550
Restructuring Reserve	170
Restructuring Charges	237
Fiscal 2011 Plans
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	1,100
Restructuring Reserve	22
Restructuring Charges	$ 0	$ 59

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Amount of costs incurred to date for the specified type of restructuring cost.

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Amount expected to be recognized in earnings for the specified restructuring cost.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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