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Risk Management Activities and Derivative Transactions Derivative Instruments That Do Not Receive Hedge Accounting Treatment (Details)		3 Months Ended
		Dec. 31, 2022 USD ($) Years	Dec. 31, 2021 USD ($)	Sep. 30, 2022 USD ($)
Derivative
Change in Unrealized gains (losses) on Interest Rate Derivatives		$ (14,000,000)	$ 11,000,000
Interest Rate Swap
Derivative
Gain (loss) recognized in income on derivatives	[1]	(15,000,000)	(29,000,000)
Amount recognized for unrealized gains (losses)		0
Fair value		(218,000,000)		$ (233,000,000)
Commodity Contract Derivatives
Derivative
Fair value		$ 71,000,000		$ 145,000,000
Natural Gas [Member]
Derivative
Number of contracts		48		44
Derivative, Nonmonetary Notional Amount		356,000,000		296,000,000
Fair value		$ 71,000,000		$ 145,000,000
Commodity Contract under FHP
Derivative
Gain (loss) recognized in income on derivatives		$ (19,000,000)	$ 0
Number of contracts		253		225
Derivative, Nonmonetary Notional Amount		300		256
Fair value		$ (121,000,000)		$ 115,000,000
Number Commodity Contract Term Years | Years		5
Commodity Contract not under FHP
Derivative
Number Commodity Contract Term Years | Years		3
[1] All of TVA's derivative instruments that do not receive hedge accounting treatment have unrealized gains (losses) that would otherwise be recognized in income but instead are deferred as regulatory assets and liabilities. As such, there were no related gains (losses) recognized in income for these unrealized gains (losses) for the three months ended December 31, 2022 and for the three months ended December 31, 2021.(2) Of the amount recognized for the three months ended December 31, 2022, $15 million and $4 million were reported in Fuel expense and Purchased power expense, respectively.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of interest rate derivatives held at each balance sheet date.

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