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Other Income (Expense), Net
 9 Months Ended
Jun. 30, 2020
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
 2020201920202019
Bellefonte deposit$—  $—  $—  $21  
Interest income3  7  14  19  
External services3  3  9  9  
Gains (losses) on investments10  3  4  2  
Miscellaneous—  1  —  1  
Total Other income (expense), net$16  $14  $27  $52  
During the three months ended June 30, 2020, Other income (expense), net increased $2 million as compared to the same period of the prior year, driven by an increase of $7 million in Gains on investments primarily related to unrealized gains on the SERP and DCP investments as a result of higher volatility in the financial markets associated with the COVID-19 pandemic. Partially offsetting this increase was a decrease of $4 million related to Interest income primarily as a result of lower interest rates. During the nine months ended June 30, 2020, Other income (expense), net decreased $25 million, primarily driven by $21 million of other income in 2019 related to a deposit liability received by TVA as a down payment on the sale of Bellefonte Nuclear Plant ("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. See Note 20 — Contingencies and Legal Proceedings — Legal Proceedings for a discussion of the lawsuit filed by Nuclear Development, LLC.