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INVESTMENTS (Tables)
12 Months Ended
Oct. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Equity Investments
The following table summarizes the company's equity investments as of October 31, 2015 and 2014 (net book value):
 
October 31,
 
2015
 
2014
 
(in millions)
Long-Term
 
 
 
Cost method investments
$
17

 
$
15

Trading securities
12

 
13

Available-for-sale investments
41

 
35

Total
$
70

 
$
63

Available-for-sale Securities
Investments in available-for-sale securities at estimated fair value were as follows:
 
October 31, 2015
 
October 31, 2014
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair
Value
 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair
Value
 
(in millions)
 
 
 
 
 
 
 
 
Equity securities
$
15

 
$
26

 
$

 
$
41

 
$
15

 
$
20

 
$

 
$
35