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Retirement and Post-Retirement Benefit Plans - Changes in Fair Value Measurements of Level 3 Investments for the Non-U.S. Defined Benefit Plans (Details) - Defined Benefit Plans - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	$ 14,127	$ 13,434
Actual return on plan assets:
Fair value—end of year	15,354	14,127
Non-U.S. Plans
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	14,127
Actual return on plan assets:
Fair value—end of year	15,354	14,127
Non-U.S. Plans | Debt-Other
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	1,238
Actual return on plan assets:
Fair value—end of year	1,421	1,238
Non-U.S. Plans | Private Equity
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	39
Actual return on plan assets:
Fair value—end of year	48	39
Non-U.S. Plans | Hybrids
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	1,594
Actual return on plan assets:
Fair value—end of year	1,748	1,594
Non-U.S. Plans | Real Estate Funds
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	295
Actual return on plan assets:
Fair value—end of year	323	295
Non-U.S. Plans | Insurance Group Annuities
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	92
Actual return on plan assets:
Fair value—end of year	131	92
Non-U.S. Plans | Other
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	120
Actual return on plan assets:
Fair value—end of year	92	120
Non-U.S. Plans | Level 3
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	756	591
Actual return on plan assets:
Relating to assets held at the reporting date	68	(31)
Relating to assets sold during the period	10	4
Purchases, sales, and settlements	158	192
Fair value—end of year	992	756
Non-U.S. Plans | Level 3 | Debt-Other
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	555	401
Actual return on plan assets:
Relating to assets held at the reporting date	43	(25)
Relating to assets sold during the period	0	0
Purchases, sales, and settlements	150	179
Fair value—end of year	748	555
Non-U.S. Plans | Level 3 | Private Equity
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	35	42
Actual return on plan assets:
Relating to assets held at the reporting date	13	(3)
Relating to assets sold during the period	10	4
Purchases, sales, and settlements	(12)	(8)
Fair value—end of year	46	35
Non-U.S. Plans | Level 3 | Hybrids
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	90	71
Actual return on plan assets:
Relating to assets held at the reporting date	10	(3)
Relating to assets sold during the period	0	0
Purchases, sales, and settlements	16	22
Fair value—end of year	116	90
Non-U.S. Plans | Level 3 | Real Estate Funds
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	39	39
Actual return on plan assets:
Relating to assets held at the reporting date	5	0
Relating to assets sold during the period	0	0
Purchases, sales, and settlements	4	0
Fair value—end of year	48	39
Non-U.S. Plans | Level 3 | Insurance Group Annuities
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	36	37
Actual return on plan assets:
Relating to assets held at the reporting date	(3)	0
Relating to assets sold during the period	0	0
Purchases, sales, and settlements	0	(1)
Fair value—end of year	33	36
Non-U.S. Plans | Level 3 | Other
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	1	1
Actual return on plan assets:
Relating to assets held at the reporting date	0	0
Relating to assets sold during the period	0	0
Purchases, sales, and settlements	0	0
Fair value—end of year	$ 1	$ 1

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(02)(A)
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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment.

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