FAIR VALUE MEASUREMENTS (Tables)
 6 Months Ended
Apr. 30, 2017
Fair Value Disclosures [Abstract]  
Fair Value Assets And Liabilities Measured On Recurring Basis
Financial assets and liabilities measured at fair value on a recurring basis as of April 30, 2017 and October 31, 2016 were as follows:
 
Fair Value Measurements at April 30, 2017
 
 Fair Value Measurements at October 31, 2016
 
Total
 
Level 1
 
Level 2
 
Level 3
 
Total
 
Level 1
 
Level 2
 
Level 3
 
(in millions)
Assets:
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Short-term
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Cash equivalents
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Money market funds
$
549

 
$
549

 
$
—

 
$
—

 
$
471

 
$
471

 
$
—

 
$
—

U.S. Treasury, government and agency debt securities
1

 
—

 
1

 
—

 
—

 
—

 
—

 
—

Corporate debt securities
2

 
—

 
2

 
—

 
—

 
—

 
—

 
—

Available-for-sale investments
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury, government and agency debt securities
26

 
—

 
26

 
—

 
—

 
—

 
—

 
—

Corporate debt securities
14

 
—

 
14

 
—

 
—

 
—

 
—

 
—

Derivative instruments (foreign exchange contracts)
5

 
—

 
5

 
—

 
4

 
—

 
4

 
—

Long-term
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Trading securities
12

 
12

 
—

 
—

 
11

 
11

 
—

 
—

Available-for-sale investments
32

 
32

 
—

 
—

 
29

 
29

 
—

 
—

Total assets measured at fair value
$
641

 
$
593

 
$
48

 
$
—

 
$
515

 
$
511

 
$
4

 
$
—

Liabilities:
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Short-term
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivative instruments (foreign exchange contracts)
$
2

 
$
—

 
$
2

 
$
—

 
$
8

 
$
—

 
$
8

 
$
—

Long-term
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Deferred compensation liability
12

 
—

 
12

 
—

 
11

 
—

 
11

 
—

Total liabilities measured at fair value
$
14

 
$
—

 
$
14

 
$
—

 
$
19

 
$
—

 
$
19

 
$
—