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Other Long-Term Liabilities Other Long-Term Liabilities (Tables) | 12 Months Ended
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Sep. 30, 2025
Other Liabilities, Noncurrent [Abstract] |
Other Long-Term Liabilities | Other long-term liabilities consist primarily of liabilities related to certain derivative agreements as well as liabilities related to environmental compliance and remediation and long-term project cost accruals. The table below summarizes the types and amounts of Other long-term liabilities:
Other Long-Term Liabilities At September 30 (in millions)
| 2025 |  | 2024(1)
Interest rate swap liabilities | $ | 643 |  |  | $ | 792 |
Environmental compliance and remediation costs | 274 |  |  | 226 |
Long-term project cost accruals | 204 |  |  | 140 |
Currency swap liabilities | 108 |  |  | 109 |
Operating lease liabilities | 63 |  |  | 88 |
Advances for construction | 61 |  |  | 55 |
Long-term deferred compensation | 54 |  |  | 50 |
EnergyRight® financing obligation | 53 |  |  | 52 |
Long-term deferred revenue | 39 |  |  | 48 |
Accrued long-term service agreements | 25 |  |  | 7 |
Commodity contract derivative liabilities | 12 |  |  | 64 |
Other | 70 |  |  | 81 |
Total other long-term liabilities | $ | 1,606 |  |  | $ | 1,712 |
Note (1) At September 30, 2024, $21 million previously classified as Other (a component of Other long-term liabilities) has been reclassified to Environmental compliance and remediation costs ($14 million) and Accrued long-term service agreements ($7 million).

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- Definition Tabular disclosure of other noncurrent liabilities. + References No definition available. + Details
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