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Other Income (Expense), Net
 12 Months Ended
Sep. 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
For the years ended September 30
 
2019
 
2018
 
2017
Bellefonte deposit
$
21

 
$
—

 
$
—

Interest income
25

 
23

 
23

External services
13

 
14

 
14

Gains (losses) on investments
3

 
6

 
9

Miscellaneous
—

 
7

 
10

Total other income (expense), net
$
62

 
$
50

 
$
56



During 2019, Other income (expense), net increased $12 million primarily driven by other income related to a $21 million 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 a decrease of $5 million resulting from gains on the disposition of prior year property and $2 million of unrealized losses on the SERP and DCP investments.