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Fair Value Measurements - Estimated Values of Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019	Aug. 09, 2013
Estimated Values of Financial Instruments (Level 2 Valuation)
EnergyRight receivables (including current portion)	$ 86	$ 100
Financing Receivable, after Allowance for Credit Loss	93	120
EnergyRight® financing obligations (including current portion)	108	126
Unfunded Loan Commitments	2	10
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount	35	37	$ 40
Long-term outstanding power bonds (including current maturities), net	26,630	26,059
Long-term debt of variable interest entities (including current maturities)	1,419	1,371
Long-term notes payable (including current maturities)	0	23
Portion at Other than Fair Value Measurement [Member]
Estimated Values of Financial Instruments (Level 2 Valuation)
EnergyRight receivables (including current portion)	87	101
Financing Receivable, after Allowance for Credit Loss	105	131
EnergyRight® financing obligations (including current portion)	97	113
Unfunded Loan Commitments	0	0
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount	26	28
Long-term outstanding power bonds (including current maturities), net	19,743	20,124
Long-term debt of variable interest entities (including current maturities)	1,089	1,128
Long-term notes payable (including current maturities)	$ 0	$ 23

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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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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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