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Other Income (Expense), Net (Tables)
 9 Months Ended
Jun. 30, 2014
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
 
 
2014
 
2013
 
2014
 
2013
 
External services
$
3

 
$
6

 
$
15

 
$
17

 
Interest income
6

 
5

 
17

 
17

 
Gains (losses) on investments
2

 
—

 
4

 
2

 
Miscellaneous
(1
)
 
(1
)
 
1

 
—

 
Total other income (expense), net
$
10

 
$
10

 
$
37

 
$
36