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Debt and Financing Arrangements (Tables)
 9 Months Ended
Jun. 30, 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 nine months ended June 30, 2018 and 2017 contained the following components (in millions):
 
Three Months Ended
June 30,
 
Nine Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
Interest expense, net of capitalized interest costs
$
110

 
$
115

 
$
328

 
$
343

Banking fees and bond cost amortization
14

 
14

 
41

 
55

Interest income
(10
)
 
(4
)
 
(24
)
 
(16
)
Net foreign exchange results for financing activities
(13
)
 
(1
)
 
(13
)
 
(6
)
Net financing charges
$
101

 
$
124

 
$
332

 
$
376