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Other Long-Term Liabilities (Tables)
 3 Months Ended
Dec. 31, 2023
Other Liabilities, Noncurrent [Abstract]  
Other Long-Term Liabilities The table below summarizes the types and amounts of Other long-term liabilities:
Other Long-Term Liabilities
(in millions)
 At December 31, 2023At September 30, 2023
Interest rate swap liabilities$782 $627 
Operating lease liabilities163 93 
Currency swap liabilities112 131 
Commodity contract derivative liabilities98 52 
EnergyRight® financing obligation
55 55 
Advances for construction46 56 
Long-term deferred revenue 46 45 
Long-term deferred compensation32 41 
Other154 111 
Total other long-term liabilities$1,488 $1,211