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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2022	Sep. 30, 2021
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight® receivables, net (including current portion)	$ 63	$ 71
Loans and other long-term receivables, net (including current portion)	120	94
EnergyRight® financing obligations (including current portion)	82	92
Unfunded loan commitments	0	3
Membership interests of VIEs subject to mandatory redemption (including current portion)	25	30
Long-term outstanding power bonds, net (including current maturities)	19,916	24,309
Long-term debt of VIEs, net (including current maturities)	1,074	1,307
Portion at Other than Fair Value Measurement [Member]
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight® receivables, net (including current portion)	63	72
Loans and other long-term receivables, net (including current portion)	128	99
EnergyRight® financing obligations (including current portion)	73	82
Unfunded loan commitments	0	0
Membership interests of VIEs subject to mandatory redemption (including current portion)	21	23
Long-term outstanding power bonds, net (including current maturities)		18,485
Long-term debt of VIEs, net (including current maturities)	18,412	$ 1,049
Long-term notes payable (including current maturities)	$ 1,029

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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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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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