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Contingencies and Legal Proceedings Legal Proceedings (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2011
Groups
Agreements
Mar. 31, 2010
USD ($)
People
Dec. 31, 2016
USD ($)
Dec. 31, 2010
Years
Jun. 30, 2011
USD ($)
Units
megawatts
Legal Proceedings          
TDEC civil penalties related to Gallatin     $ 17,000    
Plaintiff civil penalties related to Gallatin     37,500    
General          
Legal Proceedings          
Legal loss contingency accrual     51,000,000    
Environmental Agreements          
Legal Proceedings          
Number of similar environmental agreements entered into | Agreements 2        
Number of environmental agreements entered into with the EPA | Agreements 1        
Number of environmental agreements entered into with environmental advocacy groups | Groups 3        
Number of units to be idled | Units         18
Megawatts | megawatts         2,200
Megawatts option 2         3,500
Amount to be invested in certain TVA environmental projects         $ 290,000,000
Amount to be provided to fund environmental projects         60,000,000
Amount to pay civil penalties         $ 10,000,000
Case Involving Tennessee Valley Authority Retirement System          
Legal Proceedings          
Number of participants that filed suit | People   8      
Contribution from TVA   $ 1,000,000,000      
Retirement age of eligibility for cost of living adjustment before January 1, 2010 | Years       55  
Retirement age of eligibility for cost of living adjustment after January 1, 2010 | Years       60  
Other Noncurrent Liabilities | General          
Legal Proceedings          
Legal loss contingency accrual     15,000,000    
Accounts payable and accrued liabilities | General          
Legal Proceedings          
Legal loss contingency accrual     $ 36,000,000