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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Derivatives and Foreign Exchange Risk Management, Credit Risk and Other Disclosures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended					3 Months Ended
	Oct. 25, 2013	Oct. 26, 2012	Oct. 25, 2013	Oct. 26, 2012	Apr. 26, 2013	Oct. 25, 2013 Italy, Spain, Portugal and Greece	Apr. 26, 2013 Italy, Spain, Portugal and Greece	Jul. 27, 2012 Spain	Oct. 25, 2013 GREECE	Apr. 26, 2013 GREECE
General Discussion of Derivatives
Notional amount of currency exchange rate derivative instruments	$ 7,289		$ 7,289		$ 6,812
Currency exchange rate gains/(losses)	1	(25)	3	(6)
Statement [Line Items]
Accounts receivable net of allowance						757	770
Proceeds from customers								212
Deferred Revenue									$ 13	$ 21