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Other Income (Expense), Net (Tables)
 9 Months Ended
Jun. 30, 2015
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
Income and expenses not related to TVA’s operating activities are summarized in the following table:
Other Income (Expense), Net 
 
For the Three Months Ended
June 30
 
For the Nine Months Ended
June 30
 
 
2015
 
2014
 
2015
 
2014
 
Interest income
$
6

 
$
6

 
$
18

 
$
17

 
External services
3

 
3

 
9

 
15

 
Gains (losses) on investments
—

 
2

 
3

 
4

 
Miscellaneous
(1
)
 
(1
)
 
(5
)
 
1

 
Total other income (expense), net
$
8

 
$
10

 
$
25

 
$
37