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Deferred Costs, Capitalized, Prepaid, and Other Assets (Policies) | 3 Months Ended
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Dec. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
Financing Receivable | Loans and Other Long-Term Receivables. At December 31, 2024, and September 30, 2024, the carrying amount of the loans receivable, net of discount, reported in Accounts receivable, net was $9 million and $21 million, respectively. Loans receivables are reported net of allowances for uncollectible accounts. See Note 1 — Summary of Significant Accounting Policies — Allowance for Uncollectible Accounts. The allowance components, which consist of a collective allowance and specific loans allowance, are based on the risk characteristics of TVA's loans. Loans that share similar risk characteristics are evaluated on a collective basis in measuring credit losses, while loans that do not share similar risk characteristics with other loans are evaluated on an individual basis.
Allowance Components (in millions)
| At December 31, 2024 |  | At September 30, 2024
EnergyRight® loan reserve | $ | 1 |  |  | $ | 1 |
Economic development loan specific loan reserve | 1 |  |  | 1 |
Total allowance for loan losses | $ | 2 |  |  | $ | 2 |
Transfers and Servicing of Financial Assets, Transfers of Financial Assets, Financings, Policy | EnergyRight® Receivables. In association with the EnergyRight® program, TVA's local power company customers ("LPCs") offer financing to end-use customers for the purchase of energy-efficient equipment. Depending on the nature of the energy-efficiency project, loans may have a maximum term of five years or 10 years. TVA purchases the resulting loans receivable from its LPCs. The loans receivable are then transferred to a third-party bank with which TVA has agreed to repay in full any loans receivable that have been in default for 180 days or more or that TVA has determined are uncollectible. Given this continuing involvement, TVA accounts for the transfer of the loans receivable as secured borrowings. The current and long-term portions of the loans receivable are reported in Accounts receivable, net and Other long-term assets, respectively, on TVA's Consolidated Balance Sheets. At both December 31, 2024, and September 30, 2024, the carrying amount of the loans receivable, net of discount, reported in Accounts receivable, net was $12 million. See Note 10 — Other Long-Term Liabilities for information regarding the associated financing obligation.
Credit Loss, Financial Instrument |
Allowance Components (in millions)
| At December 31, 2024 |  | At September 30, 2024
EnergyRight® loan reserve | $ | 1 |  |  | $ | 1 |
Economic development loan specific loan reserve | 1 |  |  | 1 |
Total allowance for loan losses | $ | 2 |  |  | $ | 2 |
Service Agreements | Prepaid Long-Term Service Agreements. At December 31, 2024, and September 30, 2024, prepayments of $13 million and $7 million, respectively, were recorded in Other current assets.
Goodwill and Intangible Assets, Intangible Assets, Policy | Cloud Assets. At December 31, 2024, and September 30, 2024, the carrying amount of the cloud assets reported in Other current assets was $8 million and $13 million, respectively.
Commodity contract derivative asset | Commodity Contract Derivative Assets. See Note 13 — Risk Management Activities and Derivative Transactions — Derivatives Not Receiving Hedge Accounting Treatment — Commodity Derivatives and — Commodity Derivatives under the FHP for a discussion of TVA's commodity contract derivatives.

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- Definition Disclosure of accounting policy for credit loss on financial instrument measured at amortized cost basis, net investment in lease, off-balance sheet credit exposure, and available-for-sale debt security. Includes, but is not limited to, methodology used to estimate allowance for credit loss, how writeoff of uncollectible amount is recognized, and determination of past due status and nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.M.2.Q4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483530/326-20-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-14 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 30 -Paragraph 5A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479391/326-20-30-5A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3C -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3C Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 35 -Paragraph 8A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479366/326-20-35-8A Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3D -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3D Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-5 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 30 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479175/326-30-30-1B Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3C -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-3C Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-3A Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3D -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-3D Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 35 -Paragraph 13A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479148/326-30-35-13A Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 30 -Paragraph 4A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479391/326-20-30-4A Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 35 -Paragraph 7A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479148/326-30-35-7A Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-21 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-11 Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-7 Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-17 + Details
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