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Fair Value Measurements - Estimated Values of Financial Instruments (Details) - USD ($) | Sep. 30, 2024 | Sep. 30, 2023
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Estimated Values of Financial Instruments (Level 2 Valuation) |  |
EnergyRight receivables (including current portion) | $ 56,000,000 | $ 55,000,000
Financing Receivable, after Allowance for Credit Loss | 99,000,000 | 96,000,000
EnergyRight® financing obligations (including current portion) | 74,000,000 | 81,000,000
Unfunded Loan Commitments |  | 1,000,000
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount | 19,000,000 | 19,000,000
Long-term outstanding power bonds (including current maturities), net | 19,416,000,000 | 17,963,000,000
Long-term debt of variable interest entities (including current maturities) | 966,000,000 | 927,000,000
Portion at Other than Fair Value Measurement [Member] |  |
Estimated Values of Financial Instruments (Level 2 Valuation) |  |
EnergyRight receivables (including current portion) | 56,000,000 | 59,000,000
Reported Value Measurement |  |
Estimated Values of Financial Instruments (Level 2 Valuation) |  |
Financing Receivable, after Allowance for Credit Loss | 105,000,000 | 104,000,000
EnergyRight® financing obligations (including current portion) | 66,000,000 | 69,000,000
Unfunded Loan Commitments | 0 | 0
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount | 17,000,000 | 18,000,000
Long-term outstanding power bonds (including current maturities), net | 18,889,000,000 | 18,866,000,000
Long-term debt of variable interest entities (including current maturities) | $ 934,000,000 | $ 968,000,000

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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 Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(5)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Amount of long-term debt classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + 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 -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481648/480-10-50-2 + Details
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