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Fair Value Measurements - Estimated Values of Financial Instruments (Details) - USD ($)	Sep. 30, 2024	Sep. 30, 2023
Estimated Values of Financial Instruments (Level 2 Valuation)
EnergyRight receivables (including current portion)	$ 56,000,000	$ 55,000,000
Financing Receivable, after Allowance for Credit Loss	99,000,000	96,000,000
EnergyRight® financing obligations (including current portion)	74,000,000	81,000,000
Unfunded Loan Commitments		1,000,000
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount	19,000,000	19,000,000
Long-term outstanding power bonds (including current maturities), net	19,416,000,000	17,963,000,000
Long-term debt of variable interest entities (including current maturities)	966,000,000	927,000,000
Portion at Other than Fair Value Measurement [Member]
Estimated Values of Financial Instruments (Level 2 Valuation)
EnergyRight receivables (including current portion)	56,000,000	59,000,000
Reported Value Measurement
Estimated Values of Financial Instruments (Level 2 Valuation)
Financing Receivable, after Allowance for Credit Loss	105,000,000	104,000,000
EnergyRight® financing obligations (including current portion)	66,000,000	69,000,000
Unfunded Loan Commitments	0	0
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount	17,000,000	18,000,000
Long-term outstanding power bonds (including current maturities), net	18,889,000,000	18,866,000,000
Long-term debt of variable interest entities (including current maturities)	$ 934,000,000	$ 968,000,000

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- Definition

An unfunded loan commitment is typically a letter from a lending institution to a borrower detailing out the germane terms of a loan that the lender is binding itself to (amount, rate, term, collateral, etc). It is a binding contract on the part of the lender if the borrower accepts the terms of the commitment. They usually are only binding for a short period of time.

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Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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Amount of long-term debt classified as other.

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Amount that would be paid, determined under the conditions specified in the contract, if the holder of the share has the right to redeem the shares.

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Carrying amount of financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented.

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Carrying amount of liabilities associated with financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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