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(Tables)
 6 Months Ended
Apr. 30, 2017
Compensation and Retirement Disclosure [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 periods ended April 30 is comprised of the following:
 
Three Months Ended April 30,
 
Six Months Ended April 30,
 
Pension Benefits
 
Health and Life
Insurance Benefits
 
Pension Benefits
 
Health and Life
Insurance Benefits
(in millions)
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Service cost for benefits earned during the period
$
2

 
$
3

 
$
2

 
$
2

 
$
4

 
$
5

 
$
3

 
$
3

Interest on obligation
26

 
29

 
12

 
15

 
53

 
59

 
24

 
30

Amortization of cumulative loss
30

 
26

 
5

 
8

 
59

 
52

 
11

 
16

Amortization of prior service benefit
—

 
—

 
—

 
(1
)
 
—

 
—

 
—

 
(1
)
Contractual termination benefits
—

 
2

 
—

 
—

 
1

 
2

 
—

 
—

Premiums on pension insurance
4

 
4

 
—

 
—

 
8

 
8

 
—

 
—

Expected return on assets
(39
)
 
(42
)
 
(6
)
 
(7
)
 
(79
)
 
(84
)
 
(12
)
 
(13
)
Net periodic benefit expense
$
23

 
$
22

 
$
13

 
$
17

 
$
46

 
$
42

 
$
26

 
$
35