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RETIREMENT PLANS AND POST RETIREMENT PENSION PLANS (Tables)
 3 Months Ended
Jan. 31, 2020
Defined Benefit Plan [Abstract]  
Schedule of net pension and post-retirement benefit costs

Components of net periodic costs. For the three months ended January 31, 2020 and 2019, our net pension and post retirement benefit costs were comprised of the following:
 
 
Three Months Ended January 31,
 
U.S.
Pension Plans
 
Non-U.S.
Pension Plans
 
U.S. Post Retirement
Benefit Plans
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
 
(in millions)
Service cost—benefits earned during the period
$
—

 
$
—

 
$
7

 
$
6

 
$
—

 
$
—

Interest cost on benefit obligation
4

 
5

 
2

 
3

 
1

 
—

Expected return on plan assets
(8
)
 
(7
)
 
(12
)
 
(11
)
 
(1
)
 
(1
)
Amortization:
 
 
 
 
 
 
 
 
 
 
 
Actuarial losses
1

 
—

 
12

 
9

 
1

 
1

Prior service credits
—

 
—

 
—

 
—

 
(2
)
 
(2
)
Total net plan costs
$
(3
)
 
$
(2
)
 
$
9

 
$
7

 
$
(1
)
 
$
(2
)

 
 
 
 
 
 
 
 
 
 
 
 

The service cost component is recorded in cost of sales and operating expenses in the condensed consolidated statement of operations. All other cost components are recorded in other income (expense), net in the condensed consolidated statement of operations.