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Other Income (Expense), Net
 12 Months Ended
Sep. 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
For the years ended September 30
 202020192018
Bellefonte deposit$— $21 $— 
Interest income18 25 23 
External services12 13 14 
Gains (losses) on investments9 3 6 
Miscellaneous(3)— 7 
Total other income (expense), net$36 $62 $50 

During 2020, Other income (expense), net decreased $26 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. 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. Additionally, Interest income decreased $7 million primarily as a result of lower interest rates. See Note 22 — Commitments and Contingencies — Legal Proceedings for a discussion of the lawsuit filed by Nuclear Development, LLC.