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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
For the three months ended January 31, 2020 and 2019, 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 January 31,
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
 
(in millions)
Service cost—benefits earned during the period
$
6

 
$
5

 
$
4

 
$
3

 
$
—

 
$
—

Interest cost on benefit obligation
6

 
7

 
4

 
6

 
1

 
2

Expected return on plan assets
(11
)
 
(11
)
 
(21
)
 
(19
)
 
(3
)
 
(3
)
Amortization:
 
 
 
 
 
 
 
 
 
 
 
Net actuarial loss
4

 
3

 
8

 
7

 
3

 
2

Prior service credit
—

 
(1
)
 
—

 
—

 
(3
)
 
(3
)
Settlement loss
—

 
—

 
—

 
2

 
—

 
—

Net periodic benefit cost (benefit)
$
5

 
$
3

 
$
(5
)
 
$
(1
)
 
$
(2
)
 
$
(2
)