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Other Long-Term Liabilities (Tables)
6 Months Ended
Mar. 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 March 31, 2023At September 30, 2022
Interest rate swap liabilities$910 $851 
Operating lease liabilities67 93 
Currency swap liabilities156 228 
EnergyRight® financing obligation
57 58 
Long-term deferred compensation32 39 
Advances for construction44 53 
Long-term deferred revenue 40 39 
Other161 124 
Total other long-term liabilities$1,467 $1,485