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Postretirement Plans (Tables)
 12 Months Ended
Sep. 30, 2012
Postemployment Benefits [Abstract]  
Components Of Net Postretirement Benefits Expense
 
2010

 
2011

 
2012

Service cost
$
5

 
3

 
2

Interest cost
24

 
17

 
16

Net amortization
1

 
(7
)
 
(11
)
     Net postretirement expense
$
30

 
13

 
7
Reconciliations Of Actuarial Present Value Of Accumulated Postretirement Benefit Obligations
 
2011

 
2012

Benefit obligation, beginning
$
417

 
392

     Service cost
3

 
2

     Interest cost
17

 
16

     Actuarial (gain) loss
(25
)
 
(10
)
     Benefits paid
(20
)
 
(17
)
     Plan amendments
—

 
(16
)
Benefit obligation, ending (recognized in balance sheet)
$
392

 
367