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PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 6) - USD ($)
$ in Millions
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2013
Pensions      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets $ 11,164 $ 11,447 $ 11,008
Pensions | Level 1 and 2      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 6,821 7,029  
Pensions | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 5,124 5,771  
Pensions | Level 2      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 1,697 1,258  
Pensions | Cash and Short-term Investments      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 867 977  
Pensions | Cash and Short-term Investments | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 378 426  
Pensions | Cash and Short-term Investments | Level 2      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 489 551  
Pensions | U.S. Equity Securities and Funds      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 3,075 3,088  
Pensions | U.S. Equity Securities and Funds | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 3,053 3,088  
Pensions | U.S. Equity Securities and Funds | Level 2      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 22    
Pensions | International Equity Securities and Funds      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets   2,046  
Pensions | International Equity Securities and Funds | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets   2,046  
Pensions | International Equity Securities      
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      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 386 434  
Pensions | Government and Agency Securities | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 197 412  
Pensions | Government and Agency Securities | Level 2      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 189 22  
Pensions | Corporate Debt Securities      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 751 322  
Pensions | Corporate Debt Securities | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 1 1  
Pensions | Corporate Debt Securities | Level 2      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 750 321  
Pensions | Mortgage-Backed Securities      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 83 96  
Pensions | Mortgage-Backed Securities | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets   11  
Pensions | Mortgage-Backed Securities | Level 2      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 83 85  
Pensions | Fixed Income Funds      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 26 127  
Pensions | Fixed Income Funds | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 26 127  
Pensions | Real Estate      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 133 132  
Pensions | Real Estate | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 130 132  
Pensions | Real Estate | Level 2      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 3    
Pensions | Derivative Contracts - Assets      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 190 322  
Pensions | Derivative Contracts - Assets | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 25 14  
Pensions | Derivative Contracts - Assets | Level 2      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 165 308  
Pensions | Derivative Contracts - Assets | Interest Rate Contracts      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 137 246  
Pensions | Derivative Contracts - Assets | Foreign Exchange Contracts      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 17 61  
Pensions | Derivative Contracts - Assets | Equity Contracts      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 30 11  
Pensions | Derivative Contracts - Assets | Other Contracts      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 6 4  
Pensions | Derivative Contracts - Liabilities      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets (26) (39)  
Pensions | Derivative Contracts - Liabilities | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets (4) (9)  
Pensions | Derivative Contracts - Liabilities | Level 2      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets (22) (30)  
Pensions | Derivative Contracts - Liabilities | Interest Rate Contracts      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets (7) (6)  
Pensions | Derivative Contracts - Liabilities | Foreign Exchange Contracts      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets (15) (25)  
Pensions | Derivative Contracts - Liabilities | Other Contracts      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets (4) (8)  
Pensions | Receivables, Payables and Other      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 4 1  
Pensions | Receivables, Payables and Other | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 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      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 745 847  
Pensions | Securities Lending Collateral | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 92    
Pensions | Securities Lending Collateral | Level 2      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 653 847  
Pensions | Securities Lending Liability      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets (745) (847)  
Pensions | Securities Lending Liability | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets (92)    
Pensions | Securities Lending Liability | Level 2      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets (653) (847)  
Pensions | Securities Sold Short      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets (470) (477)  
Pensions | Securities Sold Short | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets (466) (477)  
Pensions | Securities Sold Short | Level 2      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets (4)    
Pensions | Investments at Net Asset Value - Short-Term Investments      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 195 108  
Pensions | Investments at Net Asset Value - U.S. Equity Funds      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 33 38  
Pensions | Investments at Net Asset Value - International Equity Funds      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 540 382  
Pensions | Investments at Net Asset Value - Corporate Debt Funds      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 26    
Pensions | Investments at Net Asset Value - Fixed Income Funds      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 495 957  
Pensions | Investments at Net Asset Value - Real Estate      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 501    
Pensions | Investments at Net Asset Value - Real Estate Funds      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets   442  
Pensions | Investments at Net Asset Value - Hedge Funds      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 625 593  
Pensions | Investments at Net Asset Value - Private Equity/Venture Capital      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 1,604 1,578  
Pensions | Investments at Net Asset Value - Other Investments      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 324 320  
Health Care and Life Insurance      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 689 957 $ 1,157
Health Care and Life Insurance | Level 1 and 2      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 435 627  
Health Care and Life Insurance | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 368 557  
Health Care and Life Insurance | Level 2      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 67 70  
Health Care and Life Insurance | Cash and Short-term Investments      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 35 52  
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 25 37  
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 10 15  
Health Care and Life Insurance | U.S. Equity Securities and Funds      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 229 310  
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 229 310  
Health Care and Life Insurance | International Equity Securities      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 39 57  
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 57  
Health Care and Life Insurance | Government and Agency Securities      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 84 164  
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 78 159  
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 6 5  
Health Care and Life Insurance | Corporate Debt Securities      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 35 33  
Health Care and Life Insurance | Corporate Debt Securities | Level 2      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 35 33  
Health Care and Life Insurance | Mortgage-Backed Securities      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 13 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 13 13  
Health Care and Life Insurance | Fixed Income Funds      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 1 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 1  
Health Care and Life Insurance | Real Estate      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 4 5  
Health Care and Life Insurance | Real Estate | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 4 5  
Health Care and Life Insurance | Derivative Contracts - Assets      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 4 5  
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 5  
Health Care and Life Insurance | Derivative Contracts - Assets | Interest Rate Contracts      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 2 3  
Health Care and Life Insurance | Derivative Contracts - Assets | Foreign Exchange Contracts      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 1 2  
Health Care and Life Insurance | Derivative Contracts - Assets | Equity Contracts      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 1    
Health Care and Life Insurance | Derivative Contracts - Liabilities      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets   (1)  
Health Care and Life Insurance | Derivative Contracts - Liabilities | Level 2      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets   (1)  
Health Care and Life Insurance | Derivative Contracts - Liabilities | Foreign Exchange Contracts      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets   (1)  
Health Care and Life Insurance | Receivables, Payables and Other      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 1 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 1  
Health Care and Life Insurance | Securities Lending Collateral      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 65 126  
Health Care and Life Insurance | Securities Lending Collateral | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets 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 56 126  
Health Care and Life Insurance | Securities Lending Liability      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets (65) (126)  
Health Care and Life Insurance | Securities Lending Liability | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets (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 (56) (126)  
Health Care and Life Insurance | Securities Sold Short      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets (10) (13)  
Health Care and Life Insurance | Securities Sold Short | Level 1      
Fair Values of Pension Plan and Health Care Assets by Category      
Total net assets (10) (13)  
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 4 3  
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 103 121  
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 47 69  
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 10 12  
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 50 72  
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 34 44  
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 $ 9