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Financial Instruments - Pre-tax Effect of Derivative Instruments in Hedging Relationships on OCI (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in OCI on Derivatives in Cash Flow Hedging Relationship	$ 75	$ 34
Total	96	(9)
Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in OCI on Derivatives in Cash Flow Hedging Relationship	76	34
Gains (Losses) Recognized in OCI on Derivatives in Net Investment Hedging Relationship	21	(43)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in OCI on Derivatives in Cash Flow Hedging Relationship	$ (1)	$ 0

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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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Section 50
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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