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Proprietary Capital Payments to the U.S. Treasury (Policies)	12 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Payments to U S Treasury	Payments to the U.S. Treasury TVA paid the U.S. Treasury $6 million, $6 million, and $5 million in 2020, 2019, and 2018, respectively, as a return on the Power Program Appropriation Investment. The amount of the return on the Power Program Appropriation Investment is based on the Power Program Appropriation Investment balance at the beginning of that year and the computed average interest rate payable by the U.S. Treasury on its total marketable public obligations at the same date. The interest rates payable by TVA on the Power Program Appropriation Investment were 2.44 percent, 2.37 percent, and 2.09 percent for 2020, 2019, and 2018, respectively.