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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Other comprehensive income (loss), tax, parenthetical disclosures [Abstract]
Unrealized gain (loss) on investments, tax	$ 0	$ 1	$ 0	$ 1
Unrealized gain (loss) on derivative instruments, tax	0	0	0	0
Amounts reclassified into earnings related to derivative instruments, tax	0	0	0	0
Foreign currency translation, tax	0	0	0	0
Net defined benefit pension cost and post retirement plan costs, tax [Abstract]
Change in actuarial net loss, tax	4	4	7	7
Change in net prior service credit, tax	$ 1	$ 2	$ 2	$ 3

X

- Definition

Amount of tax expense (benefit) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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