Retirement and Post-Retirement Benefit Plans - Fair Value of Non-U.S. Defined Benefit Plan Assets by Asset Category Within the Fair Value Hierarchy (Details) - USD ($) $ in Millions	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Discount Rate | Minimum | Valuation Technique, Discounted Cash Flow
Defined benefit plans
Measurement inputs	4.00%
Discount Rate | Maximum | Valuation Technique, Discounted Cash Flow
Defined benefit plans
Measurement inputs	17.00%
Discount Rate | Weighted Average | Valuation Technique, Discounted Cash Flow
Defined benefit plans
Measurement inputs	7.00%
Recovery Rate | Maximum | Valuation Technique, Discounted Cash Flow
Defined benefit plans
Measurement inputs	100.00%
United Kingdom | Discount Rate | Minimum | Valuation Technique, Discounted Cash Flow
Defined benefit plans
Measurement inputs	3.00%
United Kingdom | Discount Rate | Maximum | Valuation Technique, Discounted Cash Flow
Defined benefit plans
Measurement inputs	25.00%
United Kingdom | Discount Rate | Weighted Average | Valuation Technique, Discounted Cash Flow
Defined benefit plans
Measurement inputs	7.00%
Defined Benefit Plans
Defined benefit plans
Fair value of plan assets	$ 15,354	$ 14,127	$ 13,434
Defined Benefit Plans | Non-U.S. Plans
Defined benefit plans
Fair value of plan assets	15,354	14,127
Defined Benefit Plans | Non-U.S. Plans | U.S.
Defined benefit plans
Fair value of plan assets	1,012	272
Defined Benefit Plans | Non-U.S. Plans | Non-U.S.
Defined benefit plans
Fair value of plan assets	541	1,172
Defined Benefit Plans | Non-U.S. Plans | Corporate
Defined benefit plans
Fair value of plan assets	1,859	1,778
Defined Benefit Plans | Non-U.S. Plans | Government debt securities
Defined benefit plans
Fair value of plan assets	6,998	6,007
Defined Benefit Plans | Non-U.S. Plans | Government at NAV
Defined benefit plans
Fair value of plan assets	822	875
Defined Benefit Plans | Non-U.S. Plans | Other debt securities
Defined benefit plans
Fair value of plan assets	1,421	1,238
Defined Benefit Plans | Non-U.S. Plans | Private Equity
Defined benefit plans
Fair value of plan assets	48	39
Defined Benefit Plans | Non-U.S. Plans | Hybrids
Defined benefit plans
Fair value of plan assets	1,748	1,594
Defined Benefit Plans | Non-U.S. Plans | Hybrids At NAV
Defined benefit plans
Fair value of plan assets	561	504
Defined Benefit Plans | Non-U.S. Plans | Equities at NAV
Defined benefit plans
Fair value of plan assets	1,513	1,393
Defined Benefit Plans | Non-U.S. Plans | Fixed Income at NAV
Defined benefit plans
Fair value of plan assets	734	782
Defined Benefit Plans | Non-U.S. Plans | Emerging Markets at NAV
Defined benefit plans
Fair value of plan assets	464	362
Defined Benefit Plans | Non-U.S. Plans | Alternative investments at NAV
Defined benefit plans
Fair value of plan assets	214	350
Defined Benefit Plans | Non-U.S. Plans | Real Estate Funds
Defined benefit plans
Fair value of plan assets	323	295
Defined Benefit Plans | Non-U.S. Plans | Insurance Group Annuity Contracts
Defined benefit plans
Fair value of plan assets	131	92
Defined Benefit Plans | Non-U.S. Plans | Cash and cash equivalents
Defined benefit plans
Fair value of plan assets	493	417
Defined Benefit Plans | Non-U.S. Plans | Other
Defined benefit plans
Fair value of plan assets	92	120
Defined Benefit Plans | Non-U.S. Plans | Obligation to return cash received from repurchase agreements
Defined benefit plans
Fair value of plan assets	(3,620)	(3,163)
Defined Benefit Plans | United Kingdom
Defined benefit plans
Repurchase investments	5,000	5,000
Defined Benefit Plans | Level 1 | Non-U.S. Plans
Defined benefit plans
Fair value of plan assets	1,575	1,420
Defined Benefit Plans | Level 1 | Non-U.S. Plans | U.S.
Defined benefit plans
Fair value of plan assets	884	155
Defined Benefit Plans | Level 1 | Non-U.S. Plans | Non-U.S.
Defined benefit plans
Fair value of plan assets	345	955
Defined Benefit Plans | Level 1 | Non-U.S. Plans | Corporate
Defined benefit plans
Fair value of plan assets	0	0
Defined Benefit Plans | Level 1 | Non-U.S. Plans | Government debt securities
Defined benefit plans
Fair value of plan assets	0	0
Defined Benefit Plans | Level 1 | Non-U.S. Plans | Other debt securities
Defined benefit plans
Fair value of plan assets	0	0
Defined Benefit Plans | Level 1 | Non-U.S. Plans | Private Equity
Defined benefit plans
Fair value of plan assets	0	0
Defined Benefit Plans | Level 1 | Non-U.S. Plans | Hybrids
Defined benefit plans
Fair value of plan assets	19	18
Defined Benefit Plans | Level 1 | Non-U.S. Plans | Real Estate Funds
Defined benefit plans
Fair value of plan assets	29	27
Defined Benefit Plans | Level 1 | Non-U.S. Plans | Insurance Group Annuity Contracts
Defined benefit plans
Fair value of plan assets	0	0
Defined Benefit Plans | Level 1 | Non-U.S. Plans | Cash and cash equivalents
Defined benefit plans
Fair value of plan assets	254	241
Defined Benefit Plans | Level 1 | Non-U.S. Plans | Other
Defined benefit plans
Fair value of plan assets	44	24
Defined Benefit Plans | Level 1 | Non-U.S. Plans | Obligation to return cash received from repurchase agreements
Defined benefit plans
Fair value of plan assets	0	0
Defined Benefit Plans | Level 2 | Non-U.S. Plans
Defined benefit plans
Fair value of plan assets	8,479	7,685
Defined Benefit Plans | Level 2 | Non-U.S. Plans | U.S.
Defined benefit plans
Fair value of plan assets	128	117
Defined Benefit Plans | Level 2 | Non-U.S. Plans | Non-U.S.
Defined benefit plans
Fair value of plan assets	196	217
Defined Benefit Plans | Level 2 | Non-U.S. Plans | Corporate
Defined benefit plans
Fair value of plan assets	1,859	1,778
Defined Benefit Plans | Level 2 | Non-U.S. Plans | Government debt securities
Defined benefit plans
Fair value of plan assets	6,998	6,007
Defined Benefit Plans | Level 2 | Non-U.S. Plans | Other debt securities
Defined benefit plans
Fair value of plan assets	673	683
Defined Benefit Plans | Level 2 | Non-U.S. Plans | Private Equity
Defined benefit plans
Fair value of plan assets	2	4
Defined Benefit Plans | Level 2 | Non-U.S. Plans | Hybrids
Defined benefit plans
Fair value of plan assets	1,613	1,486
Defined Benefit Plans | Level 2 | Non-U.S. Plans | Real Estate Funds
Defined benefit plans
Fair value of plan assets	246	229
Defined Benefit Plans | Level 2 | Non-U.S. Plans | Insurance Group Annuity Contracts
Defined benefit plans
Fair value of plan assets	98	56
Defined Benefit Plans | Level 2 | Non-U.S. Plans | Cash and cash equivalents
Defined benefit plans
Fair value of plan assets	239	176
Defined Benefit Plans | Level 2 | Non-U.S. Plans | Other
Defined benefit plans
Fair value of plan assets	47	95
Defined Benefit Plans | Level 2 | Non-U.S. Plans | Obligation to return cash received from repurchase agreements
Defined benefit plans
Fair value of plan assets	(3,620)	(3,163)
Defined Benefit Plans | Level 3 | Non-U.S. Plans
Defined benefit plans
Fair value of plan assets	992	756	591
Defined Benefit Plans | Level 3 | Non-U.S. Plans | U.S.
Defined benefit plans
Fair value of plan assets	0	0
Defined Benefit Plans | Level 3 | Non-U.S. Plans | Non-U.S.
Defined benefit plans
Fair value of plan assets	0	0
Defined Benefit Plans | Level 3 | Non-U.S. Plans | Corporate
Defined benefit plans
Fair value of plan assets	0	0
Defined Benefit Plans | Level 3 | Non-U.S. Plans | Government debt securities
Defined benefit plans
Fair value of plan assets	0	0
Defined Benefit Plans | Level 3 | Non-U.S. Plans | Other debt securities
Defined benefit plans
Fair value of plan assets	748	555	401
Defined Benefit Plans | Level 3 | Non-U.S. Plans | Private Equity
Defined benefit plans
Fair value of plan assets	46	35	42
Defined Benefit Plans | Level 3 | Non-U.S. Plans | Hybrids
Defined benefit plans
Fair value of plan assets	116	90	71
Defined Benefit Plans | Level 3 | Non-U.S. Plans | Real Estate Funds
Defined benefit plans
Fair value of plan assets	48	39	39
Defined Benefit Plans | Level 3 | Non-U.S. Plans | Insurance Group Annuity Contracts
Defined benefit plans
Fair value of plan assets	33	36	37
Defined Benefit Plans | Level 3 | Non-U.S. Plans | Cash and cash equivalents
Defined benefit plans
Fair value of plan assets	0	0
Defined Benefit Plans | Level 3 | Non-U.S. Plans | Other
Defined benefit plans
Fair value of plan assets	1	1	$ 1
Defined Benefit Plans | Level 3 | Non-U.S. Plans | Obligation to return cash received from repurchase agreements
Defined benefit plans
Fair value of plan assets	$ 0	$ 0