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Debt and Financing Arrangements (Tables)
 6 Months Ended
Mar. 31, 2018
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 months ended March 31, 2018 and 2017 contained the following components (in millions):
 
Three Months Ended
March 31,
 
Six Months Ended
March 31,
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
Interest expense, net of capitalized interest costs
$
104

 
$
118

 
$
218

 
$
228

Banking fees and bond cost amortization
14

 
11

 
27

 
41

Interest income
(5
)
 
(5
)
 
(14
)
 
(12
)
Net foreign exchange results for financing activities
2

 
(8
)
 
—

 
(5
)
Net financing charges
$
115

 
$
116

 
$
231

 
$
252