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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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- Definition 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. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109262807&loc=d3e22047-110879 + Details
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