For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Aggregate notional amount of foreign currency exchange rate derivatives. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

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Derivatives and Foreign Exchange Risk Management, Credit Risk and Other Disclosures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jul. 26, 2013	Jul. 27, 2012	Apr. 26, 2013
General Discussion of Derivatives
Notional amount of currency exchange rate derivative instruments	$ 6,623		$ 6,812
Currency exchange rate gains/(losses)	3	19
Italy, Spain, Portugal and Greece
Statement [Line Items]
Accounts receivable net of allowance	783		770
Spain
Statement [Line Items]
Proceeds from customers		212
GREECE
Statement [Line Items]
Deferred Revenue	$ 14		$ 21