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Other Long-Term Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Sep. 30, 2023
--- | --- | ---
Other Long-Term Liabilities |  |  |
Deferred Revenue, Noncurrent |  | $ 47 | $ 45
Environmental Remediation Costs Recognized Disclosure |  |  |
Interest Rate Derivative Liabilities, at Fair Value |  | 753 | 662
Operating Lease, Liability, Noncurrent |  | 113 | 93
Currency swap liabilities | [1] | 125 | 141
Fair value |  | 80 | 52
Environmental Exit Costs, Anticipated Cost |  | (59) | 0
EnergyRight® financing obligation |  | (79) | (81)
Deferred Compensation Liability, Classified, Noncurrent |  | 38 | 41
Other long-term liabilities |  | 1,436 | 1,211
Regulatory Liability, Noncurrent |  | 94 | 107
Deferred Compensation Liability, Current |  | 51 | 65
Deferred Revenue, Current |  | 24 | 21
Long-term project cost accruals |  | 54 | 10
Operating Lease, Liability, Current |  | 63 | 71
Operating Lease, Liability, Current |  | 63 | 71
Accounts payable and accrued liabilities |  |  |
Environmental Remediation Costs Recognized Disclosure |  |  |
Environmental Exit Costs, Anticipated Cost |  | (3) | 0
EnergyRight® financing obligation |  | (14) | (14)
Customer Advances for Construction |  | 56 | 39
Other long-term liabilities |  |  |
Environmental Remediation Costs Recognized Disclosure |  |  |
Interest Rate Derivative Liabilities, at Fair Value |  | 717 | 627
Currency swap liabilities |  | 116 | 131
EnergyRight® financing obligation |  | (53) | (55)
Other |  | 101 | 101
Customer Advances for Construction |  | 58 | 56
Accounts Payable |  |  |
Environmental Remediation Costs Recognized Disclosure |  |  |
Long-term project cost accruals |  | $ 40 | $ 14
[1] | TVA records currency swaps net of cash collateral received from or paid to the counterparty if applicable, 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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