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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 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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