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Other Income (Expense), Net (Tables)
3 Months Ended
Dec. 31, 2018
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
December 31
 
 
2018
 
2017
 
Bellefonte deposit
$
21

 
$

 
Interest income
$
6

 
$
6

 
External services
3

 
4

 
Miscellaneous
1

 

 
Gains (losses) on investments
(7
)
 
2

 
Total other income (expense), net
$
24

 
$
12