Retirement and Post-Retirement Benefit Plans (Details 5) - USD ($) $ in Millions	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Post-Retirement Benefit Plans
Defined benefit plans
Fair value of plan assets	$ 50	$ 47	$ 40
Post-Retirement Benefit Plans | Registered Investment Companies
Defined benefit plans
Fair value of plan assets	50	47
Non-U.S. Plans | Defined Benefit Plans
Defined benefit plans
Fair value of plan assets	12,610	11,989	11,684
Non-U.S. Plans | Defined Benefit Plans | U.S.
Defined benefit plans
Fair value of plan assets	283	610
Non-U.S. Plans | Defined Benefit Plans | Non-U.S.
Defined benefit plans
Fair value of plan assets	505	944
Non-U.S. Plans | Defined Benefit Plans | Non-U.S. at NAV
Defined benefit plans
Fair value of plan assets	480	456
Non-U.S. Plans | Defined Benefit Plans | Corporate
Defined benefit plans
Fair value of plan assets	1,966	1,349
Non-U.S. Plans | Defined Benefit Plans | Government debt securities
Defined benefit plans
Fair value of plan assets	702	791
Non-U.S. Plans | Defined Benefit Plans | Government at NAV
Defined benefit plans
Fair value of plan assets	687	779
Non-U.S. Plans | Defined Benefit Plans | Private Equity
Defined benefit plans
Fair value of plan assets	40	36
Non-U.S. Plans | Defined Benefit Plans | Hybrids
Defined benefit plans
Fair value of plan assets	492	182
Non-U.S. Plans | Defined Benefit Plans | Hybrids At NAV
Defined benefit plans
Fair value of plan assets	2,339	1,034
Non-U.S. Plans | Defined Benefit Plans | Hedge Funds
Defined benefit plans
Fair value of plan assets	63	192
Non-U.S. Plans | Defined Benefit Plans | Hedge Funds at NAV
Defined benefit plans
Fair value of plan assets	21	30
Non-U.S. Plans | Defined Benefit Plans | Equities at NAV
Defined benefit plans
Fair value of plan assets	2,547	2,505
Non-U.S. Plans | Defined Benefit Plans | Fixed Income at NAV
Defined benefit plans
Fair value of plan assets	701	942
Non-U.S. Plans | Defined Benefit Plans | Emerging Markets at NAV
Defined benefit plans
Fair value of plan assets	368	529
Non-U.S. Plans | Defined Benefit Plans | Alternative investments at NAV
Defined benefit plans
Fair value of plan assets	363	363
Non-U.S. Plans | Defined Benefit Plans | Real Estate Funds
Defined benefit plans
Fair value of plan assets	253	510
Non-U.S. Plans | Defined Benefit Plans | Insurance Group Annuity Contracts
Defined benefit plans
Fair value of plan assets	87	100
Non-U.S. Plans | Defined Benefit Plans | Cash and cash equivalents
Defined benefit plans
Fair value of plan assets	547	375
Non-U.S. Plans | Defined Benefit Plans | Other
Defined benefit plans
Fair value of plan assets	166	262
Non-U.S. Plans | Defined Benefit Plans | Level 1
Defined benefit plans
Fair value of plan assets	900	2,029
Non-U.S. Plans | Defined Benefit Plans | Level 1 | U.S.
Defined benefit plans
Fair value of plan assets	270	576
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Non-U.S.
Defined benefit plans
Fair value of plan assets	365	838
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	38	215
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	184	329
Non-U.S. Plans | Defined Benefit Plans | Level 1 | Other
Defined benefit plans
Fair value of plan assets	43	71
Non-U.S. Plans | Defined Benefit Plans | Level 2
Defined benefit plans
Fair value of plan assets	4,061	3,193
Non-U.S. Plans | Defined Benefit Plans | Level 2 | U.S.
Defined benefit plans
Fair value of plan assets	13	34
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Non-U.S.
Defined benefit plans
Fair value of plan assets	140	106
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Corporate
Defined benefit plans
Fair value of plan assets	1,966	1,349
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Government debt securities
Defined benefit plans
Fair value of plan assets	702	791
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Private Equity
Defined benefit plans
Fair value of plan assets	7	4
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Hybrids
Defined benefit plans
Fair value of plan assets	492	182
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	63	192
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	158	269
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Insurance Group Annuity Contracts
Defined benefit plans
Fair value of plan assets	35	37
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Cash and cash equivalents
Defined benefit plans
Fair value of plan assets	363	46
Non-U.S. Plans | Defined Benefit Plans | Level 2 | Other
Defined benefit plans
Fair value of plan assets	122	183
Non-U.S. Plans | Defined Benefit Plans | Level 3
Defined benefit plans
Fair value of plan assets	143	129	596
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	33	32	27
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Hybrids
Defined benefit plans
Fair value of plan assets	0	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	236
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	57	26	229
Non-U.S. Plans | Defined Benefit Plans | Level 3 | Insurance Group Annuity Contracts
Defined benefit plans
Fair value of plan assets	52	63	69
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	$ 8	$ 35