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Other Long-Term Liabilities (Tables)
 3 Months Ended
Dec. 31, 2022
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, 2022At September 30, 2022
Interest rate swap liabilities$816 $851 
Operating lease liabilities85 93 
Currency swap liabilities159 228 
EnergyRight® financing obligation
57 58 
Long-term deferred compensation28 39 
Advances for construction42 53 
Long-term deferred revenue 40 39 
Other147 124 
Total other long-term liabilities$1,374 $1,485