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Other Income (Expense), Net (Tables)
 6 Months Ended
Mar. 31, 2016
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 
 
Three Months Ended
March 31
 
Six Months Ended
March 31
 
 
2016
 
2015
 
2016
 
2015
 
External services
$
3

 
$
3

 
$
7

 
$
6

 
Interest income
6

 
6

 
12

 
12

 
Gains (losses) on investments
—

 
2

 
3

 
3

 
Miscellaneous
(1
)
 
(3
)
 
(2
)
 
(4
)
 
Total other income (expense), net
$
8

 
$
8

 
$
20

 
$
17