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Other Long-Term Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | ---
Other Long-Term Liabilities |  |  |
Deferred Revenue, Noncurrent |  | $ 49 | $ 48
Environmental Remediation Costs Recognized Disclosure |  |  |
Interest Rate Derivative Liabilities, at Fair Value |  | 635 | 840
Operating Lease, Liability, Noncurrent |  | 93 | 88
Currency swap liabilities | [1] | 136 | 116
Fair value |  | 32 | 64
Environmental Exit Costs, Anticipated Cost |  | (210) | (212)
EnergyRight® financing obligation |  | (74) | (74)
Deferred Compensation Liability, Classified, Noncurrent |  | 37 | 50
Other long-term liabilities |  | 1,479 | 1,712
Regulatory Liability, Noncurrent |  | 78 | 83
Deferred Compensation Liability, Current |  | 33 | 74
Deferred Revenue, Current |  | 27 | 28
Long-term project cost accruals |  | 160 | 140
Operating Lease, Liability, Current |  | 69 | 63
Operating Lease, Liability, Current |  | 69 | 63
Commodity Contract Derivatives |  |  |
Environmental Remediation Costs Recognized Disclosure |  |  |
Fair value |  | 6 | 2
Accounts payable and accrued liabilities |  |  |
Environmental Remediation Costs Recognized Disclosure |  |  |
Environmental Exit Costs, Anticipated Cost |  | (5) | (3)
EnergyRight® financing obligation |  | (13) | (13)
Customer Advances for Construction |  | 85 | 60
Accounts payable and accrued liabilities | Commodity Contract Derivatives |  |  |
Environmental Remediation Costs Recognized Disclosure |  |  |
Fair value |  | (3) | (3)
Other long-term liabilities |  |  |
Environmental Remediation Costs Recognized Disclosure |  |  |
Interest Rate Derivative Liabilities, at Fair Value |  | 589 | 792
Currency swap liabilities |  | 127 | 109
EnergyRight® financing obligation |  | (52) | (52)
Other |  | 98 | 102
Customer Advances for Construction |  | 32 | 55
Other long-term liabilities | Commodity Contract Derivatives |  |  |
Environmental Remediation Costs Recognized Disclosure |  |  |
Fair value |  | (3) | (2)
Accounts Payable |  |  |
Environmental Remediation Costs Recognized Disclosure |  |  |
Long-term project cost accruals |  | 252 | 124
Other long-term assets | Commodity Contract Derivatives |  |  |
Environmental Remediation Costs Recognized Disclosure |  |  |
Fair value |  | $ 1 | $ 2
[1] | TVA records currency swaps net of cash collateral received from or paid to the counterparty, to the extent such amount is not recorded in Accounts payable and accrued liabilities. See Note 13 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.

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- Definition Carrying amount as of the balance sheet date of the liability for remediation, site restoration, postclosure, monitoring commitments, or other exit costs associated with the sale, disposal or abandonment of a particular property resulting from unanticipated contamination of the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480102/450-20-S99-1 + Details
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- Definition Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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