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Fair Value Measurements Fair Value Measurements - Estimated Values of Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018	Aug. 09, 2013
Estimated Values of Financial Instruments (Level 2 Valuation)
EnergyRight receivables (including current portion)	$ 100	$ 112
Loans and other long-term receivables, net (including current portion)	120	123
EnergyRight® financing obligation (including current portion)	126	143
Unfunded Loan Commitments	10	3
Membership interests of VIE subject to mandatory redemption (including current portion)	37	37	$ 40
Long-term outstanding power bonds (including current maturities), net	26,059	23,896
Long-term debt of variable interest entities (including current maturities)	1,371	1,256
Long-term notes payable (including current maturities)	23	68
Secured debt of VIEs
Estimated Values of Financial Instruments (Level 2 Valuation)
EnergyRight receivables (including current portion)	101	112
Loans and other long-term receivables, net (including current portion)	131	138
EnergyRight® financing obligation (including current portion)	113	127
Unfunded Loan Commitments	0	0
Membership interests of VIE subject to mandatory redemption (including current portion)	28	30
Long-term outstanding power bonds (including current maturities), net	20,124	21,189
Variable Interest Entity, Consolidated, Liabilities, No Recourse	1,128
Long-term debt of variable interest entities (including current maturities)	1,100	1,165
Long-term notes payable (including current maturities)	$ 23	$ 69

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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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Amount that would be paid, determined under the conditions specified in the contract, if the holder of the share has the right to redeem the shares.

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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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