Financial Instruments - Pre-tax Effect of Derivative Instruments in Hedging Relationships on OCI (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in OCI on Derivatives in Cash Flow Hedging Relationship	$ 296	$ 128	$ 371	$ 162
Total	408	166	504	157
Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in OCI on Derivatives in Cash Flow Hedging Relationship	301	128	377	162
Gains (Losses) Recognized in OCI on Derivatives in Net Investment Hedging Relationship	112	38	133	(5)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in OCI on Derivatives in Cash Flow Hedging Relationship	$ (5)	$ 0	$ (6)	$ 0

Other Comprehensive Income (Loss), Derivative Cash Flow and Net Investment Hedges, Increase (Decrease), Before Adjustments and Tax

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109974929&loc=SL110061190-113977

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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section 45
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Amount, before tax and reclassification, of gain (loss) from derivative designated and qualifying as net investment hedge.

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