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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) - USD ($)	Dec. 31, 2019	Sep. 30, 2019
Carrying Value
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight® receivables (including current portion)	$ 98,000,000	$ 101,000,000
Loans and other long-term receivables, net (including current portion)	135,000,000	131,000,000
EnergyRight® financing obligation (including current portion)	110,000,000	113,000,000
Unfunded loan commitments	0	0
Membership interests of VIEs subject to mandatory redemption (including current portion)	28,000,000	28,000,000
Long-term outstanding power bonds (including current maturities), net	19,970,000,000	20,124,000,000
Long-term debt of VIEs (including current maturities), net	1,128,000,000	1,128,000,000
Long-term notes payable (including current maturities)	22,000,000	23,000,000
EnergyRight® receivables (including current portion)	97,000,000	100,000,000
Loans and other long-term receivables, net (including current portion)	124,000,000	120,000,000
EnergyRight® financing obligation (including current portion)	122,000,000	126,000,000
Unfunded loan commitments	8,000,000	10,000,000
Membership interests of VIEs subject to mandatory redemption (including current portion)	36,000,000	37,000,000
Long-term outstanding power bonds (including current maturities), net	25,152,000,000	26,059,000,000
Long-term debt of VIEs (including current maturities), net	1,360,000,000	1,371,000,000
Long-term notes payable (including current maturities)	$ 22	$ 23,000,000

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

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