Retirement and Post-Retirement Benefit Plans (Details 5) - USD ($) $ in Millions	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
U.S. Defined Benefit Plans
Retirement and post-retirement benefit plans
Fair value of plan assets	$ 11,077	$ 11,979	$ 10,866
U.S. Defined Benefit Plans | U.S, equity securities
Retirement and post-retirement benefit plans
Fair value of plan assets	1,880	1,787
U.S. Defined Benefit Plans | Non-U.S, equity securities
Retirement and post-retirement benefit plans
Fair value of plan assets	1,335	1,268
U.S. Defined Benefit Plans | Corporate debt securities
Retirement and post-retirement benefit plans
Fair value of plan assets	3,269	3,290
U.S. Defined Benefit Plans | Government debt securities
Retirement and post-retirement benefit plans
Fair value of plan assets	1,756	2,204
U.S. Defined Benefit Plans | Private Equity, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets	1,170	1,284
U.S. Defined Benefit Plans | Hybrids, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets		3
U.S. Defined Benefit Plans | Hedge Funds, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets	648	609
U.S. Defined Benefit Plans | Common Collective Trusts and 103-12 Investment Entities
Retirement and post-retirement benefit plans
Fair value of plan assets	756	854
U.S. Defined Benefit Plans | Registered Investment Companies
Retirement and post-retirement benefit plans
Fair value of plan assets	214	382
U.S. Defined Benefit Plans | Cash and Cash Equivalents
Retirement and post-retirement benefit plans
Fair value of plan assets	241	227
U.S. Defined Benefit Plans | Other
Retirement and post-retirement benefit plans
Fair value of plan assets	(192)	71
U.S. Defined Benefit Plans | Fair Value Measured Using Level 1
Retirement and post-retirement benefit plans
Fair value of plan assets	3,007	3,260
U.S. Defined Benefit Plans | Fair Value Measured Using Level 1 | U.S, equity securities
Retirement and post-retirement benefit plans
Fair value of plan assets	1,833	1,787
U.S. Defined Benefit Plans | Fair Value Measured Using Level 1 | Non-U.S, equity securities
Retirement and post-retirement benefit plans
Fair value of plan assets	1,322	1,268
U.S. Defined Benefit Plans | Fair Value Measured Using Level 1 | Registered Investment Companies
Retirement and post-retirement benefit plans
Fair value of plan assets	38	68
U.S. Defined Benefit Plans | Fair Value Measured Using Level 1 | Cash and Cash Equivalents
Retirement and post-retirement benefit plans
Fair value of plan assets	38	161
U.S. Defined Benefit Plans | Fair Value Measured Using Level 1 | Other
Retirement and post-retirement benefit plans
Fair value of plan assets	(224)	(24)
U.S. Defined Benefit Plans | Fair Value Measured Using Level 2
Retirement and post-retirement benefit plans
Fair value of plan assets	6,609	7,162
U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | U.S, equity securities
Retirement and post-retirement benefit plans
Fair value of plan assets	47
U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Non-U.S, equity securities
Retirement and post-retirement benefit plans
Fair value of plan assets	13
U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Corporate debt securities
Retirement and post-retirement benefit plans
Fair value of plan assets	3,238	3,283
U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Government debt securities
Retirement and post-retirement benefit plans
Fair value of plan assets	1,756	2,204
U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Hedge Funds, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets	388	346
U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Common Collective Trusts and 103-12 Investment Entities
Retirement and post-retirement benefit plans
Fair value of plan assets	756	854
U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Registered Investment Companies
Retirement and post-retirement benefit plans
Fair value of plan assets	176	314
U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Cash and Cash Equivalents
Retirement and post-retirement benefit plans
Fair value of plan assets	203	66
U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Other
Retirement and post-retirement benefit plans
Fair value of plan assets	32	95
U.S. Defined Benefit Plans | Fair Value Measured Using Level 3
Retirement and post-retirement benefit plans
Fair value of plan assets	1,461	1,557	1,365
U.S. Defined Benefit Plans | Fair Value Measured Using Level 3 | Corporate debt securities
Retirement and post-retirement benefit plans
Fair value of plan assets	31	7
U.S. Defined Benefit Plans | Fair Value Measured Using Level 3 | Private Equity, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets	1,170	1,284	1,250
U.S. Defined Benefit Plans | Fair Value Measured Using Level 3 | Hybrids, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets		3	2
U.S. Defined Benefit Plans | Fair Value Measured Using Level 3 | Hedge Funds, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets	260	263	113
Non-U.S. Defined Benefit Plans
Retirement and post-retirement benefit plans
Fair value of plan assets	17,477	17,570	16,083
Non-U.S. Defined Benefit Plans | U.S, equity securities
Retirement and post-retirement benefit plans
Fair value of plan assets	2,927	2,965
Non-U.S. Defined Benefit Plans | Non-U.S, equity securities
Retirement and post-retirement benefit plans
Fair value of plan assets	4,662	4,872
Non-U.S. Defined Benefit Plans | Corporate debt securities
Retirement and post-retirement benefit plans
Fair value of plan assets	3,352	2,935
Non-U.S. Defined Benefit Plans | Government debt securities
Retirement and post-retirement benefit plans
Fair value of plan assets	1,534	1,787
Non-U.S. Defined Benefit Plans | Private Equity, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets	71	53
Non-U.S. Defined Benefit Plans | Hybrids, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets	2,700	2,623
Non-U.S. Defined Benefit Plans | Hedge Funds, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets	403	388
Non-U.S. Defined Benefit Plans | Real Estate Funds
Retirement and post-retirement benefit plans
Fair value of plan assets	1,084	1,040
Non-U.S. Defined Benefit Plans | Insurance Group Annuity Contracts
Retirement and post-retirement benefit plans
Fair value of plan assets	119	123
Non-U.S. Defined Benefit Plans | Common Collective Trusts and 103-12 Investment Entities
Retirement and post-retirement benefit plans
Fair value of plan assets	7
Non-U.S. Defined Benefit Plans | Registered Investment Companies
Retirement and post-retirement benefit plans
Fair value of plan assets	1
Non-U.S. Defined Benefit Plans | Cash and Cash Equivalents
Retirement and post-retirement benefit plans
Fair value of plan assets	493	573
Non-U.S. Defined Benefit Plans | Other
Retirement and post-retirement benefit plans
Fair value of plan assets	124	211
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 1
Retirement and post-retirement benefit plans
Fair value of plan assets	7,989	7,971
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 1 | U.S, equity securities
Retirement and post-retirement benefit plans
Fair value of plan assets	2,851	2,935
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 1 | Non-U.S, equity securities
Retirement and post-retirement benefit plans
Fair value of plan assets	4,085	4,050
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 1 | Hybrids, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets		114
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 1 | Hedge Funds, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets	28
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 1 | Real Estate Funds
Retirement and post-retirement benefit plans
Fair value of plan assets	464	220
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 1 | Cash and Cash Equivalents
Retirement and post-retirement benefit plans
Fair value of plan assets	493	573
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 1 | Other
Retirement and post-retirement benefit plans
Fair value of plan assets	68	79
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 2
Retirement and post-retirement benefit plans
Fair value of plan assets	8,369	8,516
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | U.S, equity securities
Retirement and post-retirement benefit plans
Fair value of plan assets	76	30
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Non-U.S, equity securities
Retirement and post-retirement benefit plans
Fair value of plan assets	494	742
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Corporate debt securities
Retirement and post-retirement benefit plans
Fair value of plan assets	3,352	2,935
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Government debt securities
Retirement and post-retirement benefit plans
Fair value of plan assets	1,534	1,787
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Private Equity, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets	1	2
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Hybrids, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets	2,670	2,466
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Hedge Funds, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets	125	103
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Real Estate Funds
Retirement and post-retirement benefit plans
Fair value of plan assets	49	277
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Insurance Group Annuity Contracts
Retirement and post-retirement benefit plans
Fair value of plan assets	46	44
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Common Collective Trusts and 103-12 Investment Entities
Retirement and post-retirement benefit plans
Fair value of plan assets	7
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Registered Investment Companies
Retirement and post-retirement benefit plans
Fair value of plan assets	1
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 2 | Other
Retirement and post-retirement benefit plans
Fair value of plan assets	14	130
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 3
Retirement and post-retirement benefit plans
Fair value of plan assets	1,119	1,083	737
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 3 | Non-U.S, equity securities
Retirement and post-retirement benefit plans
Fair value of plan assets	83	80	77
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 3 | Private Equity, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets	70	51	48
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 3 | Hybrids, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets	30	43
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 3 | Hedge Funds, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets	250	285	204
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 3 | Real Estate Funds
Retirement and post-retirement benefit plans
Fair value of plan assets	571	543	325
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 3 | Insurance Group Annuity Contracts
Retirement and post-retirement benefit plans
Fair value of plan assets	73	79	81
Non-U.S. Defined Benefit Plans | Fair Value Measured Using Level 3 | Other
Retirement and post-retirement benefit plans
Fair value of plan assets	42	2	2
Post-Retirement Benefit Plans
Retirement and post-retirement benefit plans
Fair value of plan assets	474	458	396
Post-Retirement Benefit Plans | U.S, equity securities
Retirement and post-retirement benefit plans
Fair value of plan assets	1
Post-Retirement Benefit Plans | Corporate debt securities
Retirement and post-retirement benefit plans
Fair value of plan assets	28	20
Post-Retirement Benefit Plans | Government debt securities
Retirement and post-retirement benefit plans
Fair value of plan assets	39	22
Post-Retirement Benefit Plans | Private Equity, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets	253	271
Post-Retirement Benefit Plans | Hybrids, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets		1
Post-Retirement Benefit Plans | Common Collective Trusts and 103-12 Investment Entities
Retirement and post-retirement benefit plans
Fair value of plan assets	59	55
Post-Retirement Benefit Plans | Registered Investment Companies
Retirement and post-retirement benefit plans
Fair value of plan assets	95	87
Post-Retirement Benefit Plans | Cash and Cash Equivalents
Retirement and post-retirement benefit plans
Fair value of plan assets	7	6
Post-Retirement Benefit Plans | Other
Retirement and post-retirement benefit plans
Fair value of plan assets	(8)	(4)
Post-Retirement Benefit Plans | Fair Value Measured Using Level 1
Retirement and post-retirement benefit plans
Fair value of plan assets	88	82
Post-Retirement Benefit Plans | Fair Value Measured Using Level 1 | Registered Investment Companies
Retirement and post-retirement benefit plans
Fair value of plan assets	92	86
Post-Retirement Benefit Plans | Fair Value Measured Using Level 1 | Cash and Cash Equivalents
Retirement and post-retirement benefit plans
Fair value of plan assets	4
Post-Retirement Benefit Plans | Fair Value Measured Using Level 1 | Other
Retirement and post-retirement benefit plans
Fair value of plan assets	(8)	(4)
Post-Retirement Benefit Plans | Fair Value Measured Using Level 2
Retirement and post-retirement benefit plans
Fair value of plan assets	133	104
Post-Retirement Benefit Plans | Fair Value Measured Using Level 2 | Non-U.S, equity securities
Retirement and post-retirement benefit plans
Fair value of plan assets	1
Post-Retirement Benefit Plans | Fair Value Measured Using Level 2 | Corporate debt securities
Retirement and post-retirement benefit plans
Fair value of plan assets	28	20
Post-Retirement Benefit Plans | Fair Value Measured Using Level 2 | Government debt securities
Retirement and post-retirement benefit plans
Fair value of plan assets	39	22
Post-Retirement Benefit Plans | Fair Value Measured Using Level 2 | Common Collective Trusts and 103-12 Investment Entities
Retirement and post-retirement benefit plans
Fair value of plan assets	59	55
Post-Retirement Benefit Plans | Fair Value Measured Using Level 2 | Registered Investment Companies
Retirement and post-retirement benefit plans
Fair value of plan assets	3	1
Post-Retirement Benefit Plans | Fair Value Measured Using Level 2 | Cash and Cash Equivalents
Retirement and post-retirement benefit plans
Fair value of plan assets	3	6
Post-Retirement Benefit Plans | Fair Value Measured Using Level 3
Retirement and post-retirement benefit plans
Fair value of plan assets	253	272	235
Post-Retirement Benefit Plans | Fair Value Measured Using Level 3 | Private Equity, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets	$ 253	271	234
Post-Retirement Benefit Plans | Fair Value Measured Using Level 3 | Hybrids, Alternative Investments
Retirement and post-retirement benefit plans
Fair value of plan assets		$ 1	$ 1