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Other Income (Expense), Net (Tables)
 6 Months Ended
Mar. 31, 2020
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
17.  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
 
2020
 
2019
 
2020
 
2019
Bellefonte deposit
$
—

 
$
—

 
$
—

 
$
21

Interest income
5

 
6

 
10

 
12

External services
3

 
2

 
6

 
6

Gains (losses) on investments
(11
)
 
6

 
(6
)
 
(1
)
Miscellaneous
2

 
—

 
1

 
—

Total Other income (expense), net
$
(1
)
 
$
14

 
$
11

 
$
38