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Deferred Costs, Capitalized, Prepaid, and Other Assets (Policies)
 12 Months Ended
Sep. 30, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Derivatives, Methods of Accounting, Hedging Derivatives Commodity Contract Derivative Assets. TVA enters into certain derivative contracts for natural gas that require physicaldelivery of the contracted quantity of the commodity as well as certain financial derivative contracts to hedge exposure to the price of natural gas. Commodity contract derivative assets classified as current include deliveries or settlements that will occur within 12 months or less. See Note 15 — Risk Management Activities and Derivative Transactions — Derivatives Not Receiving Hedge Accounting Treatment — Commodity Derivatives and — Commodity Derivatives under the FHP for a discussion of TVA's commodity contract derivatives.