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NEW ACCOUNTING PRONOUNCEMENTS Effect of ASU 2017-07 adoption - Adjustments in Income statement (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cost of Goods and Services Sold $ 442 $ 451 $ 870 $ 863
Research and development 171 160 344 310
Selling, general and administrative 300 305 588 600
Other income (expense), net 22 16 37 29
Change        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Research and development   4   8
Selling, general and administrative   6   12
Other income (expense), net   14   26
As originally reported        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Research and development   156   302
Selling, general and administrative   299   588
Other income (expense), net   2   3
Products        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cost of Goods and Services Sold 360 370 707 709
Products | Change        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cost of Goods and Services Sold   3   5
Products | As originally reported        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cost of Goods and Services Sold   367   704
Services and other        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cost of Goods and Services Sold $ 82 81 $ 163 154
Services and other | Change        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cost of Goods and Services Sold   1   1
Services and other | As originally reported        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cost of Goods and Services Sold   $ 80   $ 153