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Acquisitions, Goodwill and Intangible Assets (Details 3) (USD $)
In Millions, unless otherwise specified
Apr. 30, 2015
Estimated future amortization expense related to finite-lived purchased intangible assets  
2015 (remaining 6 months) $ 435us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2016 663us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2017 254us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2018 154us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2019 115us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2020 102us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter 6us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Amortizable intangible assets, net $ 1,729us-gaap_FiniteLivedIntangibleAssetsNet