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Other Long-Term Liabilities
 6 Months Ended
Mar. 31, 2025
Other Liabilities, Noncurrent [Abstract]  
Other Long-Term Liabilities
11.  Other Long-Term Liabilities

Other long-term liabilities consist primarily of liabilities related to certain derivative agreements as well as liabilities related to operating leases. The table below summarizes the types and amounts of Other long-term liabilities:
Other Long-Term Liabilities
(in millions)
 At March 31, 2025At September 30, 2024
Interest rate swap liabilities$657 $792 
Environmental compliance and remediation costs247 212 
Long-term project cost accruals181 140 
Currency swap liabilities131 109 
Operating lease liabilities80 88 
EnergyRight® financing obligation
52 52 
Long-term deferred compensation41 50 
Long-term deferred revenue 38 48 
Advances for construction22 55 
Commodity contract derivative liabilities13 64 
Other89 102 
Total other long-term liabilities$1,551 $1,712 

Interest Rate Swap Liabilities. See Note 14 — Risk Management Activities and Derivative Transactions — Overview of Accounting Treatment and Derivatives Not Receiving Hedge Accounting Treatment — Interest Rate Derivatives for information regarding the interest rate swap liabilities.

Environmental Compliance and Remediation Costs. At March 31, 2025, and September 30, 2024, the current amount of the environmental compliance and remediation costs reported in Accounts payable and accrued liabilities was $28 million and $3 million, respectively.

Long-Term Project Cost Accruals. At March 31, 2025, and September 30, 2024, the current amount of the long-term project cost accruals reported in Accounts payable and accrued liabilities was $213 million and $124 million, respectively.

Currency Swap Liabilities. See Note 14 — Risk Management Activities and Derivative Transactions — Overview of Accounting Treatment and Cash Flow Hedging Strategy for Currency Swaps for more information regarding the currency swap liabilities.

Operating Lease Liabilities. At March 31, 2025, and September 30, 2024, the current portion of TVA's operating leases reported in Accounts payable and accrued liabilities was $65 million and $63 million, respectively.

EnergyRight® Financing Obligation. At both March 31, 2025, and September 30, 2024, the carrying amount of the financing obligation reported in Accounts payable and accrued liabilities was $13 million. See Note 8 — Other Long-Term Assets for information regarding the associated loans receivable.

Long-Term Deferred Compensation. At March 31, 2025, and September 30, 2024, the current amount of deferred compensation recorded in Accounts payable and accrued liabilities was $44 million and $74 million, respectively.

Long-Term Deferred Revenue. At March 31, 2025, and September 30, 2024, the current amount of deferred revenue recorded in Accounts payable and accrued liabilities was $41 million and $28 million, respectively.

Advances for Construction. At March 31, 2025, and September 30, 2024, the current amount of advances for construction recorded in Accounts payable and accrued liabilities was $105 million and $60 million, respectively.
Commodity Contract Derivative Liabilities. See Note 14 — 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.