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Risk Management Activities and Derivative Transactions Derivative Instruments That Do Not Receive Hedge Accounting Treatment (Details)
 3 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2015
USD ($)
Derivative      
Unrealized gain (loss) on derivatives $ 0 $ 0  
Change in Unrealized gains (losses) on Interest Rate Derivatives 89,000,000 (184,000,000)  
Interest Rate Swap      
Derivative      
Amount of gain (loss) recognized in income on derivatives [1] (28,000,000) (29,000,000)  
Commodity Contract Derivatives      
Derivative      
Amount of gain (loss) recognized in income on derivatives [1] 0 0  
Fair value (138,000,000)   $ (97,000,000)
Commodity derivatives under the financial trading program      
Derivative      
Amount of gain (loss) recognized in income on derivatives [1] (36,000,000) $ (14,000,000)  
Fair value [2] $ (101,000,000)   $ (116,000,000)
Coal Contract Derivatives      
Derivative      
Number of contracts 12   14
Notional amount 20,000,000   19,000,000
Fair value $ (123,000,000)   $ (98,000,000)
Natural Gas      
Derivative      
Number of contracts 30   33
Notional amount 132,000,000   134,000,000
Fair value $ (15,000,000)   $ 1,000,000
Maximum | Coal Contract Derivatives      
Derivative      
Derivative, Term of Contract 3 years    
Maximum | Natural Gas      
Derivative      
Derivative, Term of Contract 3 years    
Natural Gas      
Derivative      
Fair value $ (101,000,000)   $ (116,000,000)
[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 months ended December 31, 2015 and 2014.
[2] Fair values of certain derivatives under the FTP that were in net liability positions totaling $80 million and $89 million at December 31, 2015 and September 30, 2015, 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.