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Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Other Long-Term Liabilities    
Finance Lease, Liability $ 159 $ 171
Interest rate swap liabilities 1,869 2,041
Capital lease obligations 4 25
Currency swap liabilities [1] 108 209
EnergyRight® financing obligation (104) (108)
Total other long-term liabilities 2,270 2,548
Regulatory Liability, Noncurrent 13 23
Increase (Decrease) in Derivative Liabilities (172)  
Deferral of EnergyRight loans 1  
Accounts payable and accrued liabilities    
Other Long-Term Liabilities    
Obligations under long-term service agreements (15)  
Interest rate swap liabilities 115 114
EnergyRight® financing obligation (19)  
Other long-term liabilities    
Other Long-Term Liabilities    
Obligations under long-term service agreements (49) (56)
Interest rate swap liabilities 1,754 1,927
Currency swap liabilities 41 123
EnergyRight® financing obligation (75) (78)
Other $ 192 $ 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.