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(Tables)
 9 Months Ended
Jul. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
Net periodic benefit expense included in our Consolidated Statements of Operations, and other amounts recognized in our Consolidated Statements of Stockholders' Deficit, for the three and nine months ended July 31, 2019 and 2018 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)
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Service cost for benefits earned during the period
$
1

 
$
1

 
$
1

 
$
1

 
$
5

 
$
5

 
$
3

 
$
3

Interest on obligation
30

 
27

 
12

 
10

 
92

 
81

 
36

 
32

Amortization of cumulative loss
23

 
26

 
—

 
3

 
70

 
79

 
—

 
7

Settlements
—

 
—

 
—

 
—

 
142

 
9

 
—

 
—

Premiums on pension insurance
3

 
1

 
—

 
—

 
7

 
3

 
—

 
—

Expected return on assets
(35
)
 
(40
)
 
(5
)
 
(5
)
 
(108
)
 
(121
)
 
(16
)
 
(17
)
Net periodic benefit expense
$
22

 
$
15

 
$
8

 
$
9

 
$
208

 
$
56

 
$
23

 
$
25