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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
For the three and six months ended April 30, 2019 and 2018, our net pension and post-retirement benefit cost (benefit) was comprised of the following:
 
Pensions
 
 
 
 
 
U.S. Defined Benefit Plans
 
Non-U.S. Defined Benefit
Plans
 
U.S. Post-Retirement
Benefit Plan
 
Three Months Ended April 30,
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
(in millions)
Service cost—benefits earned during the period
$
5

 
$
6

 
$
4

 
$
4

 
$
—

 
$
1

Interest cost on benefit obligation
7

 
6

 
5

 
6

 
2

 
1

Expected return on plan assets
(10
)
 
(9
)
 
(20
)
 
(23
)
 
(3
)
 
(3
)
Amortization:


 

 


 

 


 

Net actuarial loss
2

 
3

 
7

 
7

 
2

 
4

Prior service credit
(1
)
 
(2
)
 
—

 
—

 
(4
)
 
(4
)
Settlement loss
—

 
—

 
—

 
—

 
—

 
$
—

Net periodic benefit cost (benefit)
$
3

 
$
4

 
$
(4
)
 
$
(6
)
 
$
(3
)
 
$
(1
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Pensions
 
 
 
 
 
U.S. Defined Benefit Plans
 
Non-U.S. Defined Benefit
Plans
 
U.S. Post-Retirement
Benefit Plan
 
Six Months Ended April 30,
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
(in millions)
Service cost—benefits earned during the period
$
10

 
$
12

 
$
7

 
$
7

 
$
—

 
$
1

Interest cost on benefit obligation
14

 
12

 
11

 
12

 
4

 
3

Expected return on plan assets
(21
)
 
(18
)
 
(39
)
 
(44
)
 
(6
)
 
(7
)
Amortization:
 
 
 
 
 
 
 
 
 
 
 
Net actuarial loss
5

 
6

 
14

 
13

 
4

 
8

Prior service credit
(2
)
 
(4
)
 
—

 
—

 
(7
)
 
(7
)
Settlement loss
—

 
—

 
2

 
—

 
—

 
—

Net periodic benefit cost (benefit)
$
6

 
$
8

 
$
(5
)
 
$
(12
)
 
$
(5
)
 
$
(2
)