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Other Income (Expense), Net
 12 Months Ended
Sep. 30, 2025
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
19.  Other Income, Net

Income and expenses not related to TVA's operating activities are summarized in the following table:
Other Income, Net
For the years ended September 30
(in millions)
 202520242023
Interest income$52 $42 $34 
External services28 17 15 
Gains (losses) on investments14 23 13 
Miscellaneous(2)(11)(1)
Total other income, net$92 $71 $61