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Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Other Long-Term Liabilities      
Finance Lease, Liability $ 80 $ 80  
Gallatin coal combustion residual facilities estimated cost relocate onsite 900    
Interest rate swap liabilities 1,280 1,199  
Capital lease obligations 263 263  
Currency swap liabilities [1] 146 94  
EnergyRight® financing obligation   143 $ 140
Total other long-term liabilities 2,837 2,715  
Other long-term liabilities      
Other Long-Term Liabilities      
Obligations under long-term service agreements 74 74  
Interest rate swap liabilities 1,205 1,122  
Gallatin coal combustion residual facilities 866 862  
Capital lease obligations 177 178  
Currency swap liabilities 132 81  
EnergyRight® financing obligation 99 102  
Other(1) 204 216  
Accounts payable and accrued liabilities      
Other Long-Term Liabilities      
Accrued Environmental Loss Contingencies, Current 23 30  
Interest rate swap liabilities 75 77  
Gallatin coal combustion residual facilities $ 23    
EnergyRight® financing obligation   $ 25  
[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 — Offsetting of Derivative Assets and Liabilities.