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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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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

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
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The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

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The net gain (loss) relating to components of the gain (loss) on the cash flow hedging instrument excluded from the assessment of cash flow hedge effectiveness. Recognized in earnings.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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-Name Accounting Standards Codification
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Maximum period of time the entity is hedging its exposure to variability in future cash flows for forecasted transactions, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transactions related to payment of variable interest on existing financial instruments.

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