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Postretirement benefits (Tables)
 3 Months Ended
Jan. 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 January 31,
 
 
Pension
Benefits
 
Health and
Life Insurance
Benefits
 
 
2012
 
2011
 
2012
 
2011
(in millions)
 
 
 
 
 
 
 
 
Service cost for benefits earned during the period
 
$
4

 
$
4

 
$
1

 
$
2

Interest on obligation
 
43

 
47

 
21

 
13

Amortization of cumulative loss
 
28

 
25

 
9

 
—

Amortization of prior service benefit
 
—

 
—

 
(1
)
 
(8
)
Curtailments
 
—

 
2

 
—

 
—

Contractual termination benefits
 
—

 
3

 
(2
)
 
—

Expected return on assets
 
(48
)
 
(52
)
 
(9
)
 
(10
)
Net postretirement benefits expense (income)
 
$
27

 
$
29

 
$
19

 
$
(3
)