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Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2020
Sep. 30, 2019
Other Long-Term Liabilities    
Finance Lease, Liability $ 180 $ 182
Pipeline financing obligation 79 80
Interest rate swap liabilities 2,108 1,764
Capital lease obligations 46 223
Currency swap liabilities [1] 264 208
EnergyRight® financing obligation (112) (126)
Total other long-term liabilities 2,748 2,490
Regulatory Liability, Noncurrent 5 0
Increase (Decrease) in Derivative Liabilities 344  
Accounts payable and accrued liabilities    
Other Long-Term Liabilities    
Finance Lease, Liability 1  
Obligations under long-term service agreements (11) (12)
Interest rate swap liabilities 111 88
EnergyRight® financing obligation (20) (23)
Other long-term liabilities    
Other Long-Term Liabilities    
Obligations under long-term service agreements (59) (66)
Interest rate swap liabilities 1,997 1,676
Currency swap liabilities 166 193
EnergyRight® financing obligation (81) (90)
Other $ 186 $ 203
[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 14 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.