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Postretirement benefits (Tables)
 9 Months Ended
Jul. 31, 2012
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Expense (Income)
Net postretirement benefits expense included in our Consolidated Statements of Operations is 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)
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost for benefits earned during the period
$
5

 
$
4

 
$
1

 
$
2

 
$
13

 
$
13

 
$
5

 
$
6

Interest on obligation
43

 
47

 
20

 
13

 
129

 
141

 
62

 
40

Amortization of cumulative loss
27

 
25

 
10

 
—

 
82

 
75

 
30

 
—

Amortization of prior service benefit
1

 
1

 
(2
)
 
(7
)
 
1

 
1

 
(4
)
 
(22
)
Settlements and curtailments
—

 
—

 
—

 
11

 
—

 
2

 
—

 
11

Contractual termination benefits
—

 
35

 
—

 
6

 
—

 
38

 
(3
)
 
6

Premiums on pension insurance
—

 
—

 
—

 
—

 
1

 
1

 
—

 
—

Expected return on assets
(49
)
 
(53
)
 
(8
)
 
(10
)
 
(145
)
 
(158
)
 
(26
)
 
(31
)
Net postretirement benefits expense
$
27

 
$
59

 
$
21

 
$
15

 
$
81

 
$
113

 
$
64

 
$
10