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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Sep. 30, 2023
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Estimated Values of Financial Intruments Not Recorded at Fair Value |  |
EnergyRight® receivables, net (including current portion) | $ 53 | $ 55
Loans and other long-term receivables, net (including current portion) | 113 | 96
EnergyRight® financing obligations (including current portion) | 77 | 81
Unfunded loan commitments | 0 | 1
Membership interests of VIEs subject to mandatory redemption (including current portion) | 19 | 19
Long-term outstanding power bonds, net (including current maturities) | 18,593 | 17,963
Long-term debt of VIEs, net (including current maturities) | 936 | 927
Reported Value Measurement |  |
Estimated Values of Financial Intruments Not Recorded at Fair Value |  |
EnergyRight® receivables, net (including current portion) | 56 | 59
Loans and other long-term receivables, net (including current portion) | 120 | 104
EnergyRight® financing obligations (including current portion) | 65 | 69
Unfunded loan commitments | 0 | 0
Membership interests of VIEs subject to mandatory redemption (including current portion) | 17 | 18
Long-term outstanding power bonds, net (including current maturities) | 18,870 | 18,866
Long-term debt of VIEs, net (including current maturities) | $ 951 | $ 968

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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 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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