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(Tables)
 3 Months Ended
Jan. 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 months ended January 31, 2020 and 2019 are comprised of the following:
 
Three Months Ended January 31,
 
Pension Benefits
 
Health and Life
Insurance Benefits
(in millions)
2020
 
2019
 
2020
 
2019
Service cost for benefits earned during the period
$
2

 
$
2

 
$
1

 
$
1

Interest on obligation
21

 
32

 
7

 
12

Amortization of cumulative loss
25

 
24

 
—

 
—

Settlements
—

 
142

 
—

 
—

Premiums on pension insurance
3

 
1

 
—

 
—

Expected return on assets
(36
)
 
(38
)
 
(5
)
 
(5
)
Net periodic benefit expense
$
15

 
$
163

 
$
3

 
$
8