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Financial Instruments - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016 | Mar. 31, 2018
Investments, All Other Investments [Abstract] |  |  |  |
Interest income | $ 116,000,000 | $ 66,000,000 | $ 24,000,000 |
Investment Holdings [Line Items] |  |  |  |
Collateralized arrangements in net liability position | $ 68,000,000 | $ 258,000,000 |  |
Period to collateralize | 2 days | 2 days |  |
Notional amount | $ 23,655,000,000 | $ 24,573,000,000 |  |
Portion of the hedging instruments gain or loss excluded from the assessment of effectiveness for fair value, cash flow or net investment hedges | $ 0 | 0 | $ 0 |
Cash flow hedges |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Maturity period of foreign currency cash flow hedges | 12 months |  |  |
Gain expected to be reclassified from Accumulated OCI into earnings in next 12 months | $ 248,000,000 |  |  |
Cash flow hedges | Minimum |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Duration of lease term for which lease-related forward contracts and intercompany lease loan forward contracts can be extended | 2 years |  |  |
Cash flow hedges | Maximum |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Duration of lease term for which lease-related forward contracts and intercompany lease loan forward contracts can be extended | 5 years |  |  |
Other Non-Current Assets | Equity securities in privately held companies |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Equity investments | $ 36,000,000 | $ 37,000,000 |  |
Interest rate swap | Fair value hedges |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Notional amount |  |  |  | $ 1,500,000,000

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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