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(Tables)
 9 Months Ended
Jul. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
Net periodic benefit expense included in our Consolidated Statements of Operations for the three and nine months ended July 31, 2020 and 2019 are comprised of the following:
 
Three Months Ended July 31,
 
Nine Months Ended July 31,
 
Pension Benefits
 
Health and Life
Insurance Benefits
 
Pension Benefits
 
Health and Life
Insurance Benefits
(in millions)
2020
 
2019
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Service cost for benefits earned during the period
$
2

 
$
1

 
$
1

 
$
1

 
$
6

 
$
5

 
$
3

 
$
3

Interest on obligation
21

 
30

 
7

 
12

 
63

 
92

 
21

 
36

Amortization of cumulative loss
24

 
23

 
—

 
—

 
73

 
70

 
—

 
—

Settlements
7

 
—

 
—

 
—

 
7

 
142

 
—

 
—

Premiums on pension insurance
3

 
3

 
—

 
—

 
9

 
7

 
—

 
—

Expected return on assets
(36
)
 
(35
)
 
(5
)
 
(5
)
 
(108
)
 
(108
)
 
(15
)
 
(16
)
Net periodic benefit expense
$
21

 
$
22

 
$
3

 
$
8

 
$
50

 
$
208

 
$
9

 
$
23