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Other Income (Expense), Net (Tables)
 6 Months Ended
Mar. 31, 2013
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
March 31
 
For the Six Months Ended
March 31
 
2013
 
2012
 
2013
 
2012
Interest income
$
6

 
$
2

 
$
11

 
$
4

External services
4

 
(1
)
 
11

 
3

Gains (losses) on investments
2

 
2

 
3

 
4

Miscellaneous
(1
)
 
(17
)
 
1

 
(16
)
Total other income (expense), net
$
11

 
$
(14
)
 
$
26

 
$
(5
)