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Commitments and Contingencies (Schedule Of Future Minimum Lease Payments Under All Noncancelable Operating Leases) (Details) (USD $)
In Millions, unless otherwise specified
Apr. 25, 2015
Commitments and Contingencies Disclosure [Abstract]  
2015 (remaining three months) $ 97us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016 304us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 210us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018 153us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019 85us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter 228us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Total $ 1,077us-gaap_OperatingLeasesFutureMinimumPaymentsDue