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Postretirement benefits (Tables)
 6 Months Ended
Apr. 30, 2012
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Expense (Income)
Net postretirement benefits expense (income) included in our Consolidated Statements of Operations 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
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
(in millions)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost for benefits earned during the period
$
4

 
$
5

 
$
2

 
$
2

 
$
8

 
$
9

 
$
4

 
$
4

Interest on obligation
43

 
47

 
21

 
14

 
86

 
94

 
42

 
27

Amortization of cumulative loss
27

 
25

 
11

 
—

 
55

 
50

 
20

 
—

Amortization of prior service benefit
—

 
—

 
(1
)
 
(7
)
 
—

 
—

 
(2
)
 
(15
)
Settlements and curtailments
—

 
—

 
—

 
—

 
—

 
2

 
—

 
—

Contractual termination benefits
—

 
—

 
—

 
—

 
—

 
3

 
(3
)
 
—

Premiums on pension insurance
1

 
1

 
—

 
—

 
1

 
1

 
—

 
—

Expected return on assets
(48
)
 
(53
)
 
(9
)
 
(11
)
 
(96
)
 
(105
)
 
(18
)
 
(21
)
Net postretirement benefits expense (income)
$
27

 
$
25

 
$
24

 
$
(2
)
 
$
54

 
$
54

 
$
43

 
$
(5
)