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Supplementary Financial Information - Other Non-Current Assets (Details) - USD ($) $ in Millions | Jul. 31, 2020 | Oct. 31, 2019
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Deferred tax assets | $ 2,506 | $ 2,620
Right-of-use assets from operating leases, net | 1,099 | 0
Intangible assets | 572 | 661
Other | 754 | 843
Other non-current assets | 4,931 | 4,124
Equity securities | $ 57 | $ 56

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