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Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Derivative Instruments That Do Not Receive Hedge Accounting Treatment (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Derivative    
Amount of gain (loss) recognized in income on derivatives $ 0  
Unrealized gains/losses on derivatives 0 0
FTP transaction limit 130  
Maximum hedge volume 75.00%  
Market value limitation of outstanding construction materials hedging transactions 100  
Portfolio value at risk limit for foreign currency transactions 5  
Interest Rate Swap
    
Derivative    
Amount of gain (loss) recognized in income on derivatives 0 [1] 0 [1]
Unrealized losses on investments 524 (168)
Commodity Contract Derivatives
    
Derivative    
Amount of gain (loss) recognized in income on derivatives (11) [1] (22) [1]
Fair value (141) (267)
Commodity Derivatives Under Financial Trading Program
    
Derivative    
Amount of gain (loss) recognized in income on derivatives (126) [1] (342) [1]
Fair value (166) [2] (228) [2]
Coal Contract Derivatives
    
Derivative    
Number of contracts 19 23
Notional amount 43,000,000 46,000,000
Fair value (140) (267)
Natural Gas Contract Derivatives
    
Derivative    
Number of contracts 13 25
Notional amount 39,000,000 51,000,000
Fair value (1) 0
Futures and options contracts
    
Derivative    
Remaining terms 0  
Swap contracts
    
Derivative    
Remaining terms 5 years  
Maximum | Coal Contract Derivatives
    
Derivative    
Derivative, Term of Contract 5 years  
Maximum | Natural Gas Contract Derivatives
    
Derivative    
Derivative, Term of Contract 2 years  
Coal Contract Derivatives
    
Derivative    
Unrealized gains/losses on derivatives 0 0
Fair value $ 0 $ 0
[1] All of TVA's derivative instruments that do not receive hedge accounting treatment have unrealized gains (losses) that would otherwise be recognized in income but 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 theyears ended 2013 and 2012.
[2] The September 30, 2013, and September 30, 2012 balances in the Derivatives Under Financial Trading Program table show all open derivative positions in the FTP.