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Risk Management Activities and Derivative Transactions Derivative Instruments That Do Not Receive Hedge Accounting Treatment (Details) (USD $)
 1 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Jul. 15, 2012
Apr. 15, 2012
Dec. 31, 2012
Interest Rate Swap
Dec. 31, 2011
Interest Rate Swap
Dec. 31, 2012
Coal Contract Derivatives
Sep. 30, 2012
Coal Contract Derivatives
Dec. 31, 2012
Commodity Contract Derivatives
Dec. 31, 2011
Commodity Contract Derivatives
Dec. 31, 2012
Commodity Derivatives Under Financial Trading Program
Dec. 31, 2011
Commodity Derivatives Under Financial Trading Program
Sep. 30, 2012
Commodity Derivatives Under Financial Trading Program
Dec. 31, 2012
Natural Gas Contract Derivatives
Sep. 30, 2012
Natural Gas Contract Derivatives
Derivative                                
Amount of gain (loss) recognized in income on derivatives   $ 0       $ 0 [1] $ 0 [1]     $ 0 [1] $ (7,000,000) [1] $ (45,000,000) [1] $ (56,000,000) [1]      
Interest rate derivatives - fixed interest rate         8.25%                      
Interest rate derivatives - notional amount       1,000,000,000                        
Unrealized gains (losses) on investments           114,000,000 (4,000,000)                  
Fair value               (224,000,000) (267,000,000)     (240,000,000) [2]   (229,000,000) [2] 0 0
Maximum number of years left on the derivative terms               5 years             three years  
Ineffective portion excluded from testing   0 0                          
Number of contracts               21 23           25 25
Notional amount               48,000,000 46,000,000           55,000,000 51,000,000
Unrealized gain (loss) on derivatives   0 0                          
Amount of bond issuance $ 1,000,000,000 [3]                              
[1] All of TVA's derivative instruments that do not receive hedge accounting treatment have unrealized gains (losses) that would otherwise be recognized in incomebut instead are deferred as regulatory assets and liabilities. As such, there was no related gain (loss) recognized in income for these unrealized gains (losses) for the three months ended December 31, 2012, and 2011.
[2] The December 31, 2012, and September 30, 2012 balances in the Derivatives Under Financial Trading Program table show all open derivative positions in the FTP.
[3] The 2012 Series B bonds were issued at 97.49 percent of par.