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Retirement and Post-Retirement Benefit Plans - Pre-Tax Net Actuarial Loss and Prior Service Benefit Recognized in Accumulated Other Comprehensive Loss for the Defined Benefit Plans (Details) $ in Millions	Oct. 31, 2021 USD ($)
Defined Benefit Plans
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Net actuarial loss (gain)	$ 2,575
Prior service benefit	(14)
Total recognized in accumulated other comprehensive loss	2,561
Post-Retirement Benefit Plans
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Net actuarial loss (gain)	(2)
Prior service benefit	0
Total recognized in accumulated other comprehensive loss	$ (2)

X

- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

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- Definition

Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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