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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) - USD ($)	Jun. 30, 2019	Sep. 30, 2018
Carrying Value
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight® receivables (including current portion)	$ 103,000,000	$ 112,000,000
Loans and other long-term receivables, net (including current portion)	125,000,000	138,000,000
EnergyRight® financing obligation (including current portion)	115,000,000	127,000,000
Unfunded loan commitments	0	0
Membership interest of variable interest entities subject to mandatory redemption (including current portion)	29,000,000	30,000,000
Long-term outstanding power bonds (including current maturities), net	20,145,000,000	21,189,000,000
Long-term debt of variable interest entities (including current maturities), net	1,147,000,000	1,165,000,000
Long-term notes payable (including current maturities)	23,000,000	69,000,000
EnergyRight® receivables (including current portion)	102,000,000	112,000,000
Loans and other long-term receivables, net (including current portion)	111,000,000	123,000,000
EnergyRight® financing obligation (including current portion)	129,000,000	143,000,000
Unfunded loan commitments	9,000,000	3,000,000
Membership interest of variable interest entities subject to mandatory redemption (including current portion)	37,000,000	37,000,000
Long-term outstanding power bonds (including current maturities), net	24,846,000,000	23,896,000,000
Long-term debt of variable interest entities (including current maturities), net	1,351,000,000	1,256,000,000
Long-term notes payable (including current maturities)	$ 23	$ 68,000,000

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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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