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Derivatives and Foreign Exchange Risk Management , Credit Risk and Other Disclosures (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended
Apr. 25, 2014
Apr. 26, 2013
Apr. 27, 2012
Apr. 25, 2014
Portugal, Italy, Greece and Spain
Apr. 26, 2013
Portugal, Italy, Greece and Spain
Apr. 25, 2014
Spain
Jul. 27, 2012
Spain
Apr. 25, 2014
Greece
Apr. 26, 2013
Greece
Apr. 25, 2014
Foreign Currency Exchange Rate Contracts
Apr. 26, 2013
Foreign Currency Exchange Rate Contracts
General Discussion of Derivatives                      
Derivative, Notional Amount                   $ 8,051 $ 6,812
Net currency exchange rate gains/(losses) (1) 25 (183)                
Concentration Risk [Line Items]                      
Derivative Assets and Liabilities, Net, Collateral, Obligation to Return Cash 0 30                  
Concentrations of Credit Risk                      
Accounts receivable net of allowance       628 770            
Proceeds from customers           106 212        
Deferred Revenue               $ 15 $ 21