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RETIREMENT PLANS AND POST RETIREMENT PENSION PLANS (Tables)
 6 Months Ended
Apr. 30, 2019
Defined Benefit Plan [Abstract]  
Schedule of net pension and post-retirement benefit costs
Components of net periodic costs. For the three and six months ended April 30, 2019 and 2018, our net pension and post retirement benefit costs were comprised of the following:
 
 
Three Months Ended April 30,
 
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
$
—

 
$
—

 
$
4

 
$
4

 
$
—

 
$
—

Interest cost on benefit obligation
5

 
4

 
3

 
3

 
1

 
1

Expected return on plan assets
(7
)
 
(7
)
 
(11
)
 
(12
)
 
(1
)
 
(2
)
Amortization:
 
 
 
 
 
 
 
 
 
 
 
Actuarial losses
—

 
—

 
9

 
8

 
1

 
2

Prior service credits
—

 
—

 
—

 
—

 
(2
)
 
(2
)
Total net plan costs
$
(2
)
 
$
(3
)
 
$
5

 
$
3

 
$
(1
)
 
$
(1
)


 
Six Months Ended April 30,
 
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
$
—

 
$
—

 
$
10

 
$
10

 
$
—

 
$
—

Interest cost on benefit obligation
10

 
8

 
6

 
6

 
1

 
2

Expected return on plan assets
(14
)
 
(14
)
 
(22
)
 
(23
)
 
(2
)
 
(4
)
Amortization:
 
 
 
 
 
 
 
 
 
 
 
Actuarial losses
—

 
—

 
18

 
15

 
2

 
4

Prior service credits
—

 
—

 
—

 
—

 
(4
)
 
(4
)
Total net plan costs
$
(4
)
 
$
(6
)
 
$
12

 
$
8

 
$
(3
)
 
$
(2
)
Settlements gains
$
—

 
$
—

 
$
—

 
$
(5
)
 
$
—

 
$
—