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Debt and Financing Arrangements (Tables)
 6 Months Ended
Mar. 31, 2019
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, 2019 and 2018 contained the following components (in millions):
 
Three Months Ended
March 31,
 
Six Months Ended
March 31,
 
2019
 
2018
 
2019
 
2018
 
 
 
 
 
 
 
 
Interest expense, net of capitalized interest costs
$
97

 
$
99

 
$
188

 
$
201

Banking fees and bond cost amortization
7

 
8

 
13

 
15

Interest income
(6
)
 
(1
)
 
(13
)
 
(8
)
Net foreign exchange results for financing activities
—

 
1

 
(5
)
 
1

Net financing charges
$
98

 
$
107

 
$
183

 
$
209