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Fair Value Measurements - Estimated Values of Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020
Estimated Values of Financial Instruments (Level 2 Valuation)
EnergyRight receivables (including current portion)	$ 71	$ 86
Financing Receivable, after Allowance for Credit Loss	94	93
EnergyRight® financing obligations (including current portion)	92	108
Unfunded Loan Commitments	3	2
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount	30	35
Long-term outstanding power bonds (including current maturities), net	24,309	26,630
Long-term debt of variable interest entities (including current maturities)	1,307	1,419
Portion at Other than Fair Value Measurement [Member]
Estimated Values of Financial Instruments (Level 2 Valuation)
EnergyRight receivables (including current portion)	72	87
Financing Receivable, after Allowance for Credit Loss	99	105
EnergyRight® financing obligations (including current portion)	82	97
Unfunded Loan Commitments	0	0
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount	23	26
Long-term outstanding power bonds (including current maturities), net	18,485	19,743
Long-term debt of variable interest entities (including current maturities)	$ 1,049	$ 1,089

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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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Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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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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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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