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Other Income (Expense), Net
 9 Months Ended
Jun. 30, 2018
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
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
June 30
 
Nine Months Ended
June 30
 
 
2018
 
2017
 
2018
 
2017
 
Interest income
$
6

 
$
5

 
$
17

 
$
17

 
External services
2

 
3

 
10

 
11

 
Gains (losses) on investments
1

 
3

 
4

 
6

 
Miscellaneous
2

 
1

 
3

 
5

 
Total other income (expense), net
$
11

 
$
12

 
$
34

 
$
39