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FAIR VALUE MEASUREMENTS - Recurring, Level 3 Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis - Level 3 - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Fair Value, Recurring, Level 3 Measurements from Available for Sale Marketable Securities    
Beginning of period balance $ 29  
Purchases 25 $ 30
Principal payments (22)  
Change in unrealized gain (loss) (4) (1)
End of period balance $ 28 $ 29