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Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Sep. 30, 2019
Other Long-Term Liabilities    
Finance Lease, Liability $ 179 $ 182
Pipeline financing obligation 79 80
Interest rate swap liabilities 2,150 1,764
Increase in Interest rate Derivative Liabilities, at Fair Value 369  
Capital lease obligations 87 223
Currency swap liabilities [1] 295 208
EnergyRight® financing obligation (117) (126)
Total other long-term liabilities 2,914 2,490
Regulatory Liability, Noncurrent 1  
Accounts payable and accrued liabilities    
Other Long-Term Liabilities    
Finance Lease, Liability 1  
Obligations under long-term service agreements (13) (12)
Interest rate swap liabilities 105 88
EnergyRight® financing obligation (21) (23)
Other long-term liabilities    
Other Long-Term Liabilities    
Obligations under long-term service agreements 61 66
Interest rate swap liabilities 2,045 1,676
Currency swap liabilities 280 193
EnergyRight® financing obligation (85) (90)
Other $ 185 $ 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.