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Other Income (Expense), Net
 9 Months Ended
Jun. 30, 2019
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
 
 
2019
 
2018
 
2019
 
2018
 
Bellefonte deposit
$
—

 
$
—

 
$
21

 
$
—

 
Interest income
7

 
6

 
19

 
17

 
External services
3

 
2

 
9

 
10

 
Gains (losses) on investments
3

 
1

 
2

 
4

 
Miscellaneous
1

 
2

 
1

 
3

 
Total Other income (expense), net
$
14

 
$
11

 
$
52

 
$
34

 


During the three months ended June 30, 2019, Other income (expense), net increased $3 million primarily driven by $2 million of unrealized gains on the SERP and DCP investments and an increase of $1 million related to interest income during the quarter. During the nine months ended June 30, 2019, Other income (expense), net increased $18 million primarily driven by $21 million of other income related to a deposit liability received by TVA as a down payment on the sale of Bellefonte. The purchaser, Nuclear Development, LLC, failed to fulfill the requirements of the sales contract with respect to obtaining NRC approval of the transfer of required nuclear licenses and payment of the remainder of the selling price before the November 30, 2018, closing date. Partially offsetting this increase was $2 million of unrealized losses on the SERP and DCP investments.