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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)
mmBtu in Millions, Tons in Millions
 12 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
mmBtu
Tons
Contracts
Derivative    
Change in Unrealized gains (losses) on Interest Rate Derivatives $ 279,000,000 $ 149,000,000
Unrealized gains/losses on derivatives 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 [1] (114,000,000) (114,000,000)
Commodity Contract Derivatives    
Derivative    
Amount of gain (loss) recognized in income on derivatives [2] 0 (64,000,000)
Fair value (97,000,000) (96,000,000)
Commodity Derivatives Under Financial Trading Program    
Derivative    
Amount of gain (loss) recognized in income on derivatives [2] (98,000,000) (43,000,000)
Fair value [3] $ (116,000,000) $ (103,000,000)
Coal Contract Derivatives    
Derivative    
Number of contracts 14 24
Notional amount 19,000,000 31
Fair value $ (98,000,000) $ (86,000,000)
Natural Gas    
Derivative    
Number of contracts 33 46
Notional amount 134,000,000 62
Fair value $ 1,000,000 $ (10,000,000)
Maximum | Coal Contract Derivatives    
Derivative    
Derivative, Term of Contract 3 years 3 years
Coal Contract Derivatives    
Derivative    
Fair value $ 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 2015 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, 2015, to temporarily fall below the notional amount of the interest rate swaps.
[2] 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 the years ended September 30, 2015 and 2014.
[3] Fair values of certain derivatives under the FTP that were in net liability positions totaling $89 million and $69 million at September 30, 2015 and September 30, 2014, 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.