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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 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2013
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Jul. 15, 2012
Apr. 15, 2012
Mar. 31, 2013
Interest Rate Swap
Mar. 31, 2012
Interest Rate Swap
Mar. 31, 2013
Interest Rate Swap
Mar. 31, 2012
Interest Rate Swap
Mar. 31, 2013
Coal Contract Derivatives
Sep. 30, 2012
Coal Contract Derivatives
Mar. 31, 2013
Commodity Contract Derivatives
Mar. 31, 2012
Commodity Contract Derivatives
Mar. 31, 2013
Commodity Contract Derivatives
Mar. 31, 2012
Commodity Contract Derivatives
Mar. 31, 2013
Commodity Derivatives Under Financial Trading Program
Mar. 31, 2012
Commodity Derivatives Under Financial Trading Program
Mar. 31, 2013
Commodity Derivatives Under Financial Trading Program
Mar. 31, 2012
Commodity Derivatives Under Financial Trading Program
Sep. 30, 2012
Commodity Derivatives Under Financial Trading Program
Mar. 31, 2013
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] $ 0 [1]     $ 0 [1] $ (3,000,000) [1] $ 0 [1] $ (16,000,000) [1] $ (32,000,000) [1] $ (88,000,000) [1] $ (77,000,000) [1] $ (144,000,000) [1]      
Interest rate derivatives - fixed interest rate             8.25%                                  
Interest rate derivatives - notional amount           1,000,000,000                                    
Unrealized gains (losses) on investments               99,000,000   213,000,000                            
Fair value                       (148,000,000) (267,000,000)         (161,000,000) [2]   (161,000,000) [2]   (229,000,000) [2] 0 0
Maximum number of years left on the derivative terms                       5 years                     two years  
Number of contracts                       21 23                   14 25
Notional amount                       43,000,000 46,000,000                   45,000,000 51,000,000
Unrealized gain (loss) on derivatives   0 0 0 0                                      
Amount of bond issuance $ 22,000,000                                              
[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 and six months ended March 31, 2013, and 2012.
[2]