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INVESTMENTS (Tables)
12 Months Ended
Oct. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Equity Investments
The net book value of investments as of October 31, 2019 and 2018 was as follows:
 
October 31,
 
2019
 
2018
 
(in millions)
Long-Term
 
 
 
Equity investments
$
37

 
$
30

Equity investments - other
9

 
16

Total
$
46

 
$
46


Available-for-sale Securities
Net recognized gains (losses) on equity investments were as follows:
 
Year Ended October 31,
 
2019
 
2018
 
2017
 
(in millions)
Net realized gains on investments sold
$
1

 
$

 
$

Net unrealized gains on investments still held
6

 

 
2