Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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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	9 Months Ended		12 Months Ended
	Jan. 23, 2015	Jan. 23, 2015	Jan. 24, 2014	Apr. 25, 2014 customer
Concentration Risk [Line Items]
Currency exchange rate gains/(losses)	$ 27	$ 29	$ 3
Cash collateral received	304	304		0
Customer Concentration Risk \| Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, number of customers		0		0
Italy, Spain, Portugal and Greece
Concentration Risk [Line Items]
Accounts receivable net of allowance	535	535		628
Greece
Concentration Risk [Line Items]
Deferred revenue	19	19		15
Foreign Currency Exchange Rate Contracts
Concentration Risk [Line Items]
Derivative, notional amount	$ 6,121	$ 6,121		8,051