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Other Income (Expense), Net
 6 Months Ended
Mar. 31, 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
March 31
 
Six Months Ended
March 31
 
 
2019
 
2018
 
2019
 
2018
 
Bellefonte deposit
$
—

 
$
—

 
$
21

 
$
—

 
Interest income
6

 
6

 
12

 
11

 
External services
2

 
4

 
6

 
8

 
Miscellaneous
—

 
1

 
—

 
1

 
Gains (losses) on investments
6

 
—

 
(1
)
 
3

 
Total other income (expense), net
$
14

 
$
11

 
$
38

 
$
23

 


During the three months ended March 31, 2019, other income (expense), net increased $3 million primarily driven by $6 million of unrealized gains on the SERP and DCP investments during the quarter. During the six months ended March 31, 2019, other income (expense), net increased $15 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.