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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight® receivables, net (including current portion)	$ 62	$ 62
Loans and other long-term receivables, net (including current portion)	100	96
EnergyRight® financing obligations (including current portion)	81	81
Unfunded loan commitments	1	0
Membership interests of VIEs subject to mandatory redemption (including current portion)	22	22
Long-term outstanding power bonds, net (including current maturities)	17,790	18,070
Long-term debt of VIEs, net (including current maturities)	1,009	989
Portion at Other than Fair Value Measurement [Member]
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight® receivables, net (including current portion)	61	62
Loans and other long-term receivables, net (including current portion)	109	105
EnergyRight® financing obligations (including current portion)	72	72
Unfunded loan commitments	0	0
Membership interests of VIEs subject to mandatory redemption (including current portion)	20	20
Long-term outstanding power bonds, net (including current maturities)		17,856
Long-term debt of VIEs, net (including current maturities)	17,894	$ 1,007
Long-term notes payable (including current maturities)	$ 1,007

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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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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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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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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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