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Goodwill and Intangible Assets - Schedule of Estimated Future Amortization Expense Related to Finite-lived Intangible Assets (Details)
$ in Millions
Jul. 31, 2017
USD ($)
Estimated future amortization expense related to finite-lived purchased intangible assets  
2017 (remaining 3 months) $ 113
2018 383
2019 306
2020 248
2021 107
2022 78
Thereafter 92
Total $ 1,327