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FAIR VALUE MEASUREMENTS (Details 4) - Assets and Liabilities Measured at Fair Value on a Recurring Basis - Level 3
$ in Millions
3 Months Ended
Jan. 31, 2016
USD ($)
Fair Value, Recurring, Level 3 Measurements from Available for Sale Marketable Securities  
Beginning of period balance $ 29
Purchases 25
Principal Payments (2)
Change in unrealized gain (loss) (8)
End of period balance $ 44