PENSION AND OTHER POSTRETIREMENT BENEFITS - Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Pensions
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	$ 11,137	$ 11,164	$ 11,447
Pensions | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	7,020	6,821
Pensions | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	5,007	5,124
Pensions | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	2,013	1,697
Pensions | Cash and Short-term Investments | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	684	867
Pensions | Cash and Short-term Investments | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	322	378
Pensions | Cash and Short-term Investments | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	362	489
Pensions | U.S. Equity Securities and Funds | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	3,000	3,075
Pensions | U.S. Equity Securities and Funds | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	2,965	3,053
Pensions | U.S. Equity Securities and Funds | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	35	22
Pensions | International Equity Securities and Funds | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	1,711
Pensions | International Equity Securities and Funds | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	1,697
Pensions | International Equity Securities and Funds | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	14
Pensions | International Equity Securities | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets		1,802
Pensions | International Equity Securities | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets		1,781
Pensions | International Equity Securities | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets		21
Pensions | Government and Agency Securities | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	440	386
Pensions | Government and Agency Securities | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	224	197
Pensions | Government and Agency Securities | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	216	189
Pensions | Corporate Debt Securities | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	1,205	751
Pensions | Corporate Debt Securities | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets		1
Pensions | Corporate Debt Securities | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	1,205	750
Pensions | Mortgage-Backed Securities | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	39	83
Pensions | Mortgage-Backed Securities | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	39	83
Pensions | Fixed Income Funds | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	20	26
Pensions | Fixed Income Funds | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	20	26
Pensions | Real Estate | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	121	133
Pensions | Real Estate | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	118	130
Pensions | Real Estate | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	3	3
Pensions | Derivative Contracts - Assets | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	191	190
Pensions | Derivative Contracts - Assets | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	3	25
Pensions | Derivative Contracts - Assets | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	188	165
Pensions | Derivative Contracts - Assets | Interest Rate Contracts | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	125	137
Pensions | Derivative Contracts - Assets | Foreign Exchange Contracts | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	59	17
Pensions | Derivative Contracts - Assets | Equity Contracts | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	4	30
Pensions | Derivative Contracts - Assets | Other Contracts | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	3	6
Pensions | Derivative Contracts - Liabilities | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(59)	(26)
Pensions | Derivative Contracts - Liabilities | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(14)	(4)
Pensions | Derivative Contracts - Liabilities | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(45)	(22)
Pensions | Derivative Contracts - Liabilities | Interest Rate Contracts | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(19)	(7)
Pensions | Derivative Contracts - Liabilities | Foreign Exchange Contracts | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(33)	(15)
Pensions | Derivative Contracts - Liabilities | Equity Contracts | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(6)
Pensions | Derivative Contracts - Liabilities | Other Contracts | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(1)	(4)
Pensions | Receivables, Payables and Other | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	6	4
Pensions | Receivables, Payables and Other | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	5	3
Pensions | Receivables, Payables and Other | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	1	1
Pensions | Securities Lending Collateral | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	693	745
Pensions | Securities Lending Collateral | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	108	92
Pensions | Securities Lending Collateral | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	585	653
Pensions | Securities Lending Liability | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(693)	(745)
Pensions | Securities Lending Liability | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(108)	(92)
Pensions | Securities Lending Liability | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(585)	(653)
Pensions | Securities Sold Short | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(338)	(470)
Pensions | Securities Sold Short | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(333)	(466)
Pensions | Securities Sold Short | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(5)	(4)
Pensions | Investments at Net Asset Value - Short-Term Investments
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	216	195
Pensions | Investments at Net Asset Value - U.S. Equity Funds
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	30	33
Pensions | Investments at Net Asset Value - International Equity Funds
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	595	540
Pensions | Investments at Net Asset Value - Corporate Debt Funds
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	25	26
Pensions | Investments at Net Asset Value - Fixed Income Funds
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	482	495
Pensions | Investments at Net Asset Value - Real Estate
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	515	501
Pensions | Investments at Net Asset Value - Hedge Funds
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	624	625
Pensions | Investments at Net Asset Value - Private Equity/Venture Capital
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	1,603	1,604
Pensions | Investments at Net Asset Value - Other Investments
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	27	324
Health Care and Life Insurance
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	435	689	$ 957
Health Care and Life Insurance | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	279	435
Health Care and Life Insurance | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	227	368
Health Care and Life Insurance | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	52	67
Health Care and Life Insurance | Cash and Short-term Investments | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	32	35
Health Care and Life Insurance | Cash and Short-term Investments | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	27	25
Health Care and Life Insurance | Cash and Short-term Investments | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	5	10
Health Care and Life Insurance | U.S. Equity Securities and Funds | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	138	229
Health Care and Life Insurance | U.S. Equity Securities and Funds | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	138	229
Health Care and Life Insurance | International Equity Securities and Funds | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	25
Health Care and Life Insurance | International Equity Securities and Funds | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	25
Health Care and Life Insurance | International Equity Securities | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets		39
Health Care and Life Insurance | International Equity Securities | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets		39
Health Care and Life Insurance | Government and Agency Securities | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	43	84
Health Care and Life Insurance | Government and Agency Securities | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	40	78
Health Care and Life Insurance | Government and Agency Securities | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	3	6
Health Care and Life Insurance | Corporate Debt Securities | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	30	35
Health Care and Life Insurance | Corporate Debt Securities | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	30	35
Health Care and Life Insurance | Mortgage-Backed Securities | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	11	13
Health Care and Life Insurance | Mortgage-Backed Securities | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	11	13
Health Care and Life Insurance | Fixed Income Funds | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets		1
Health Care and Life Insurance | Fixed Income Funds | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets		1
Health Care and Life Insurance | Real Estate | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	2	4
Health Care and Life Insurance | Real Estate | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	2	4
Health Care and Life Insurance | Derivative Contracts - Assets | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	3	4
Health Care and Life Insurance | Derivative Contracts - Assets | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets		1
Health Care and Life Insurance | Derivative Contracts - Assets | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	3	3
Health Care and Life Insurance | Derivative Contracts - Assets | Interest Rate Contracts | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	2	2
Health Care and Life Insurance | Derivative Contracts - Assets | Foreign Exchange Contracts | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	1	1
Health Care and Life Insurance | Derivative Contracts - Assets | Equity Contracts | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets		1
Health Care and Life Insurance | Receivables, Payables and Other | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets		1
Health Care and Life Insurance | Receivables, Payables and Other | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets		1
Health Care and Life Insurance | Securities Lending Collateral | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	48	65
Health Care and Life Insurance | Securities Lending Collateral | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	11	9
Health Care and Life Insurance | Securities Lending Collateral | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	37	56
Health Care and Life Insurance | Securities Lending Liability | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(48)	(65)
Health Care and Life Insurance | Securities Lending Liability | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(11)	(9)
Health Care and Life Insurance | Securities Lending Liability | Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(37)	(56)
Health Care and Life Insurance | Securities Sold Short | Level 1 and Level 2
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(5)	(10)
Health Care and Life Insurance | Securities Sold Short | Level 1
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	(5)	(10)
Health Care and Life Insurance | Investments at Net Asset Value - Short-Term Investments
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	3	4
Health Care and Life Insurance | Investments at Net Asset Value - International Equity Funds
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	60	103
Health Care and Life Insurance | Investments at Net Asset Value - Fixed Income Funds
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	20	47
Health Care and Life Insurance | Investments at Net Asset Value - Real Estate Funds
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	7	10
Health Care and Life Insurance | Investments at Net Asset Value - Hedge Funds
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	44	50
Health Care and Life Insurance | Investments at Net Asset Value - Private Equity/Venture Capital
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets	$ 22	34
Health Care and Life Insurance | Investments at Net Asset Value - Other Investments
Fair Values of Pension Plan and Health Care Assets by Category
Total net assets		$ 6