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Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2019
Sep. 30, 2018
Other Long-Term Liabilities    
Asset Retirement Obligation, Liabilities Incurred $ 14  
Finance Lease, Liability 80 $ 80
Gallatin coal combustion residual facilities estimated cost relocate onsite 900  
Interest rate swap liabilities 1,408 1,199
Capital lease obligations 223 263
Currency swap liabilities [1] 123 94
EnergyRight® financing obligation 135 143
Total other long-term liabilities 2,914 2,715
Accounts Payable and Accrued Liabilities    
Other Long-Term Liabilities    
Finance Lease, Liability 1  
Obligations under long-term service agreements 15 30
Accrued Environmental Loss Contingencies, Current 22 30
Interest rate swap liabilities 78 77
Increase in Interest rate Derivative Liabilities, at Fair Value 208  
Gallatin coal combustion residual facilities 22  
EnergyRight® financing obligation 24 25
Other long-term liabilities    
Other Long-Term Liabilities    
Obligations under long-term service agreements 71 74
Accrued Environmental Loss Contingencies, Current 96  
Interest rate swap liabilities 1,330 1,122
Gallatin coal combustion residual facilities 864 862
Capital lease obligations 176 178
Currency swap liabilities 110 81
EnergyRight® financing obligation   102
Other(1) $ 187 $ 216
[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 — Offsetting of Derivative Assets and Liabilities.