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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2020	Sep. 30, 2020
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight® receivables, net (including current portion)	$ 82	$ 86
Loans and other long-term receivables, net (including current portion)	96	93
EnergyRight® financing obligations (including current portion)	104	108
Unfunded loan commitments	6	2
Membership interests of VIEs subject to mandatory redemption (including current portion)	35	35
Long-term outstanding power bonds (including current maturities), net	26,801	26,630
Long-term debt of VIEs (including current maturities), net	1,430	1,419
Carrying Value
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight® receivables, net (including current portion)	82	87
Loans and other long-term receivables, net (including current portion)	109	105
EnergyRight® financing obligations (including current portion)	94	97
Unfunded loan commitments	0	0
Membership interests of VIEs subject to mandatory redemption (including current portion)	26	26
Long-term outstanding power bonds (including current maturities), net		19,743
Long-term debt of VIEs (including current maturities), net	19,790	$ 1,089
Long-term notes payable (including current maturities)	$ 1,090

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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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