Retirement and Post-Retirement Benefit Plans (Details 5) - USD ($) $ in Millions	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Post-Retirement Benefit Plans
Defined benefit plans
Fair value of plan assets	$ 52	$ 50	$ 47
Post-Retirement Benefit Plans | Registered Investment Companies
Defined benefit plans
Fair value of plan assets	52	50
Non-U.S. Plans | Defined Benefit Plans
Defined benefit plans
Fair value of plan assets	12,167	12,610	11,989
Non-U.S. Plans | Defined Benefit Plans | U.S.
Defined benefit plans
Fair value of plan assets	194	283
Non-U.S. Plans | Defined Benefit Plans | Non-U.S.
Defined benefit plans
Fair value of plan assets	569	505
Non-U.S. Plans | Defined Benefit Plans | Non-U.S. at NAV
Defined benefit plans
Fair value of plan assets	473	480
Non-U.S. Plans | Defined Benefit Plans | Corporate
Defined benefit plans
Fair value of plan assets	1,221	1,966
Non-U.S. Plans | Defined Benefit Plans | Government debt securities
Defined benefit plans
Fair value of plan assets	4,621	702
Non-U.S. Plans | Defined Benefit Plans | Government at NAV
Defined benefit plans
Fair value of plan assets	692	687
Non-U.S. Plans | Defined Benefit Plans | Private Equity
Defined benefit plans
Fair value of plan assets	42	40
Non-U.S. Plans | Defined Benefit Plans | Hybrids
Defined benefit plans
Fair value of plan assets	1,346	492
Non-U.S. Plans | Defined Benefit Plans | Hybrids At NAV
Defined benefit plans
Fair value of plan assets	506	2,339
Non-U.S. Plans | Defined Benefit Plans | Hedge Funds
Defined benefit plans
Fair value of plan assets	45	63
Non-U.S. Plans | Defined Benefit Plans | Hedge Funds at NAV
Defined benefit plans
Fair value of plan assets	0	21
Non-U.S. Plans | Defined Benefit Plans | Equities at NAV
Defined benefit plans
Fair value of plan assets	1,929	2,547
Non-U.S. Plans | Defined Benefit Plans | Fixed Income at NAV
Defined benefit plans
Fair value of plan assets	639	701
Non-U.S. Plans | Defined Benefit Plans | Emerging Markets at NAV
Defined benefit plans
Fair value of plan assets	275	368
Non-U.S. Plans | Defined Benefit Plans | Alternative investments at NAV
Defined benefit plans
Fair value of plan assets	378	363
Non-U.S. Plans | Defined Benefit Plans | Real Estate Funds
Defined benefit plans
Fair value of plan assets	229	253
Non-U.S. Plans | Defined Benefit Plans | Insurance Group Annuity Contracts
Defined benefit plans
Fair value of plan assets	97	87
Non-U.S. Plans | Defined Benefit Plans | Cash and cash equivalents
Defined benefit plans
Fair value of plan assets	423	547
Non-U.S. Plans | Defined Benefit Plans | Other
Defined benefit plans
Fair value of plan assets	290	166
Non-U.S. Plans | Defined Benefit Plans | Obligation to Return Cash Received From Repurchase Agreements
Defined benefit plans
Fair value of plan assets	(1,802)	0
Non-U.S. Plans | Defined Benefit Plans | Level 1
Defined benefit plans
Fair value of plan assets	743	900
Non-U.S. Plans | Defined Benefit Plans | Level 1 | U.S.
Defined benefit plans
Fair value of plan assets	187	270
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Non-U.S.
Defined benefit plans
Fair value of plan assets	344	365
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Corporate
Defined benefit plans
Fair value of plan assets	0	0
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Government debt securities
Defined benefit plans
Fair value of plan assets	0	0
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Private Equity
Defined benefit plans
Fair value of plan assets	0	0
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Hybrids
Defined benefit plans
Fair value of plan assets	0	0
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Hybrids At NAV
Defined benefit plans
Fair value of plan assets
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Hedge Funds
Defined benefit plans
Fair value of plan assets	0	0
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Equities at NAV
Defined benefit plans
Fair value of plan assets
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Fixed Income at NAV
Defined benefit plans
Fair value of plan assets
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Emerging Markets at NAV
Defined benefit plans
Fair value of plan assets
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Alternative investments at NAV
Defined benefit plans
Fair value of plan assets
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Real Estate Funds
Defined benefit plans
Fair value of plan assets	6	38
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Insurance Group Annuity Contracts
Defined benefit plans
Fair value of plan assets	0	0
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Cash and cash equivalents
Defined benefit plans
Fair value of plan assets	167	184
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Other
Defined benefit plans
Fair value of plan assets	39	43
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Obligation to Return Cash Received From Repurchase Agreements
Defined benefit plans
Fair value of plan assets	0	0
Non-U.S. Plans | Defined Benefit Plans | Level 2
Defined benefit plans
Fair value of plan assets	6,284	4,061
Non-U.S. Plans | Defined Benefit Plans | Level 2 | U.S.
Defined benefit plans
Fair value of plan assets	7	13
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Non-U.S.
Defined benefit plans
Fair value of plan assets	225	140
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Corporate
Defined benefit plans
Fair value of plan assets	1,221	1,966
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Government debt securities
Defined benefit plans
Fair value of plan assets	4,621	702
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Private Equity
Defined benefit plans
Fair value of plan assets	2	7
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Hybrids
Defined benefit plans
Fair value of plan assets	1,214	492
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Hybrids At NAV
Defined benefit plans
Fair value of plan assets
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Hedge Funds
Defined benefit plans
Fair value of plan assets	45	63
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Equities at NAV
Defined benefit plans
Fair value of plan assets
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Fixed Income at NAV
Defined benefit plans
Fair value of plan assets
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Emerging Markets at NAV
Defined benefit plans
Fair value of plan assets
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Alternative investments at NAV
Defined benefit plans
Fair value of plan assets
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Real Estate Funds
Defined benefit plans
Fair value of plan assets	186	158
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Insurance Group Annuity Contracts
Defined benefit plans
Fair value of plan assets	59	35
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Cash and cash equivalents
Defined benefit plans
Fair value of plan assets	256	363
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Other
Defined benefit plans
Fair value of plan assets	250	122
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Obligation to Return Cash Received From Repurchase Agreements
Defined benefit plans
Fair value of plan assets	(1,802)	0
Non-U.S. Plans | Defined Benefit Plans | Level 3
Defined benefit plans
Fair value of plan assets	248	143	129
Non-U.S. Plans | Defined Benefit Plans | Level 3 | U.S.
Defined benefit plans
Fair value of plan assets	0	0
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Non-U.S.
Defined benefit plans
Fair value of plan assets	0	0
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Corporate
Defined benefit plans
Fair value of plan assets	0	0
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Government debt securities
Defined benefit plans
Fair value of plan assets	0	0
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Private Equity
Defined benefit plans
Fair value of plan assets	40	33	32
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Hybrids
Defined benefit plans
Fair value of plan assets	132	0
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Hybrids At NAV
Defined benefit plans
Fair value of plan assets
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Hedge Funds
Defined benefit plans
Fair value of plan assets	0	0
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Equities at NAV
Defined benefit plans
Fair value of plan assets
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Fixed Income at NAV
Defined benefit plans
Fair value of plan assets
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Emerging Markets at NAV
Defined benefit plans
Fair value of plan assets
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Alternative investments at NAV
Defined benefit plans
Fair value of plan assets
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Real Estate Funds
Defined benefit plans
Fair value of plan assets	37	57	26
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Insurance Group Annuity Contracts
Defined benefit plans
Fair value of plan assets	38	52	63
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Cash and cash equivalents
Defined benefit plans
Fair value of plan assets	0	0
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Other
Defined benefit plans
Fair value of plan assets	1	1	$ 8
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Obligation to Return Cash Received From Repurchase Agreements
Defined benefit plans
Fair value of plan assets	$ 0	$ 0