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Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2021
Sep. 30, 2020
Other Long-Term Liabilities    
Finance Lease, Liability $ 143 $ 171
Interest rate swap liabilities 1,512 2,041
Capital lease obligations 0 25
Currency swap liabilities [1] 86 209
EnergyRight® financing obligation (99) (108)
Total other long-term liabilities 1,867 2,548
Regulatory Liability, Noncurrent 5 23
Increase (Decrease) in Derivative Liabilities (529)  
Deferral of EnergyRight loans 1  
Accounts payable and accrued liabilities    
Other Long-Term Liabilities    
Obligations under long-term service agreements (20) (15)
Interest rate swap liabilities 114  
EnergyRight® financing obligation (18) (19)
Other long-term liabilities    
Other Long-Term Liabilities    
Obligations under long-term service agreements (40) (56)
Interest rate swap liabilities 1,398 1,927
Currency swap liabilities 21 123
EnergyRight® financing obligation (71) (78)
Other $ 194 $ 193
[1] TVA records currency swaps net of cash collateral received from or paid to the counterparty, to the extent such amount is not recorded in Accounts payable and accrued liabilities. See Note 13 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.