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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 $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Derivative    
Change in Unrealized gains (losses) on Interest Rate Derivatives $ (149,000,000) $ 524,000,000
Amount of gain (loss) recognized in income on derivatives (57,000,000)  
Unrealized gains/losses on derivatives 0 0
FTP transaction limit 130,000,000  
Maximum hedge volume 75.00%  
Market value limitation of outstanding construction materials hedging transactions 100,000,000  
Portfolio value at risk limit for foreign currency transactions 5,000,000  
Interest Rate Swap
    
Derivative    
Amount of gain (loss) recognized in income on derivatives 0 [1] 0 [1]
Commodity Contract Derivatives
    
Derivative    
Amount of gain (loss) recognized in income on derivatives (64,000,000) (11,000,000)
Fair value (96,000,000) (141,000,000)
Commodity Derivatives Under Financial Trading Program
    
Derivative    
Amount of gain (loss) recognized in income on derivatives (43,000,000) (126,000,000)
Fair value (103,000,000) [2] (166,000,000) [2]
Coal Contract Derivatives
    
Derivative    
Number of contracts 24 19
Notional amount 31,000,000 43,000,000
Fair value (86,000,000) (140,000,000)
Natural Gas
    
Derivative    
Number of contracts 46 13
Notional amount 62,000,000 39,000,000
Fair value (10,000,000) (1,000,000)
Maximum | Coal Contract Derivatives
    
Derivative    
Derivative, Term of Contract 3 years  
Maximum | Natural Gas
    
Derivative    
Derivative, Term of Contract 2 years  
Coal Contract Derivatives
    
Derivative    
Unrealized gains/losses on derivatives 0 0
Fair value $ 0 $ 0
[1] Generally, TVA maintains a level of outstanding discount notes equal to or greater than the notional amount of the interest rate swaps. However, in September 2014 TVA issued long-term Bonds in anticipation of the maturity of other long-term debt, and used the proceeds to pay down discount notes, which caused the balance of discount notes outstanding at September 30, 2014, to fall below the notional amount of the interest rate swaps. There is no impact on the statements of operations due to the use of regulatory accounting for these items.
[2] Fair values of certain derivatives under the FTP that were in net liability positions totaling $69 million and $100 million at September 30, 2014 and September 30, 2013, respectively, are recorded in TVA's margin cash accounts in Other current assets. These derivatives are transacted with futures commission merchants, and cash deposits have been posted to the margin cash accounts held with each futures commission merchant to offset the net liability positions in full.