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FAIR VALUE MEASUREMENTS (Details 4) - Assets and Liabilities Measured at Fair Value on a Recurring Basis - Level 3 - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2016
Apr. 30, 2016
Fair Value, Recurring, Level 3 Measurements from Available for Sale Marketable Securities    
Beginning of period balance $ 44 $ 29
Purchases   25
Principal payments (6) (8)
Change in unrealized gain (loss) 2 (6)
End of period balance $ 40 $ 40