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Debt and Financing Arrangements (Tables)
 6 Months Ended
Mar. 31, 2013
Debt Disclosure [Abstract]  
Components of Net Financing Charges
The Company's net financing charges line item in the consolidated statements of income for the three and six month periods ended March 31, 2013 and 2012 contained the following components (in millions):

 
Three Months Ended March 31,
 
Six Months Ended March 31,
 
2013
 
2012
 
2013
 
2012
 
 
 
 
 
 
 
 
Interest expense, net of capitalized interest costs
$
69

 
$
62

 
$
129

 
$
111

Banking fees and bond cost amortization
5

 
7

 
10

 
14

Interest income
(3
)
 
(4
)
 
(7
)
 
(7
)
Net foreign exchange results for financing activities
(5
)
 
(2
)
 
(5
)
 
(6
)
Net financing charges
$
66

 
$
63

 
$
127

 
$
112