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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 30, 2023
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight® receivables, net (including current portion)	$ 55	$ 55
Loans and other long-term receivables, net (including current portion)	97	96
EnergyRight® financing obligations (including current portion)	81	81
Unfunded loan commitments	0	1
Membership interests of VIEs subject to mandatory redemption (including current portion)	20	19
Long-term outstanding power bonds, net (including current maturities)	19,079	17,963
Long-term debt of VIEs, net (including current maturities)	987	927
Reported Value Measurement
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight® receivables, net (including current portion)	59	59
Loans and other long-term receivables, net (including current portion)	105	104
EnergyRight® financing obligations (including current portion)	69	69
Unfunded loan commitments	0	0
Membership interests of VIEs subject to mandatory redemption (including current portion)	18	18
Long-term outstanding power bonds, net (including current maturities)	18,889	18,866
Long-term debt of VIEs, net (including current maturities)	$ 968	$ 968

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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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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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