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RETIREMENT PLANS AND POST RETIREMENT PENSION PLANS (Tables)
 9 Months Ended
Jul. 31, 2019
Defined Benefit Plan [Abstract]  
Schedule of net pension and post-retirement benefit costs

Components of net periodic costs. For the three and nine months ended July 31, 2019 and 2018, our net pension and post retirement benefit costs were comprised of the following:
 
 
Three Months Ended July 31,
 
U.S.
Pension Plans
 
Non-U.S.
Pension Plans
 
U.S. Post Retirement
Benefit Plans
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
(in millions)
Service cost—benefits earned during the period
$
—

 
$
—

 
$
6

 
$
6

 
$
—

 
$
—

Interest cost on benefit obligation
5

 
4

 
3

 
3

 
1

 
1

Expected return on plan assets
(7
)
 
(7
)
 
(11
)
 
(11
)
 
(1
)
 
(2
)
Amortization:
 
 
 
 
 
 
 
 
 
 
 
Actuarial losses
—

 
1

 
9

 
7

 
1

 
2

Prior service credits
—

 
—

 
—

 
—

 
(2
)
 
(2
)
Total net plan costs
$
(2
)
 
$
(2
)
 
$
7

 
$
5

 
$
(1
)
 
$
(1
)


 
Nine Months Ended July 31,
 
U.S.
Pension Plans
 
Non-U.S.
Pension Plans
 
U.S. Post Retirement
Benefit Plans
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
(in millions)
Service cost—benefits earned during the period
$
—

 
$
—

 
$
16

 
$
16

 
$
—

 
$
—

Interest cost on benefit obligation
15

 
12

 
9

 
9

 
2

 
3

Expected return on plan assets
(21
)
 
(21
)
 
(33
)
 
(34
)
 
(3
)
 
(6
)
Amortization:
 
 
 
 
 
 
 
 
 
 
 
Actuarial losses
—

 
1

 
27

 
22

 
3

 
6

Prior service credits
—

 
—

 
—

 
—

 
(6
)
 
(6
)
Total net plan costs
$
(6
)
 
$
(8
)
 
$
19

 
$
13

 
$
(4
)
 
$
(3
)
Settlements gains
$
—

 
$
—

 
$
—

 
$
(5
)
 
$
—

 
$
—