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Other Long-Term Liabilities (Tables)
9 Months Ended
Jun. 30, 2021
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 June 30, 2021At September 30, 2020
Interest rate swap liabilities$1,552 $1,927 
Operating lease liabilities137 171 
Currency swap liabilities44 123 
EnergyRight® financing obligations
68 78 
Accrued long-term service agreements36 56 
Other199 193 
Total other long-term liabilities$2,036 $2,548