Derivatives and Foreign Exchange Risk Management, Credit Risk and Other Disclosures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended					3 Months Ended
	Jul. 25, 2014	Jul. 26, 2013	Apr. 25, 2014	Jul. 25, 2014 Italy, Spain, Portugal and Greece	Apr. 25, 2014 Italy, Spain, Portugal and Greece	Apr. 26, 2013 Spain	Jul. 25, 2014 GREECE	Apr. 25, 2014 GREECE	Jul. 25, 2014 Foreign Currency Exchange Rate Contracts	Apr. 25, 2014 Foreign Currency Exchange Rate Contracts
General Discussion of Derivatives
Derivative, Notional Amount									$ 7,306	$ 8,051
Currency exchange rate gains/(losses)	(12)	3
Statement [Line Items]
Derivative, Collateral, Obligation to Return Cash	0		0						0	0
Accounts receivable net of allowance				619	628
Proceeds from customers						106
Deferred Revenue							$ 17	$ 15