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Other Long-Term Liabilities Other Long-Term Liabilities (Tables)
 12 Months Ended
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 costs274 226 
Long-term project cost accruals204 140 
Currency swap liabilities108 109 
Operating lease liabilities63 88 
Advances for construction61 55 
Long-term deferred compensation54 50 
EnergyRight® financing obligation
53 52 
Long-term deferred revenue39 48 
Accrued long-term service agreements25 7 
Commodity contract derivative liabilities12 64 
Other70 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).