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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, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
Derivative      
Amount recognized for unrealized gains (losses) $ 0 $ 0  
Change in Unrealized gains (losses) on Interest Rate Derivatives (441,000,000) (89,000,000)  
Interest Rate Swap      
Derivative      
Gain (loss) recognized in income on derivatives [1] (26,000,000) (28,000,000)  
Commodity Contract Derivatives      
Derivative      
Gain (loss) recognized in income on derivatives [1] (2,000,000) 0  
Fair value (87,000,000)   $ (125,000,000)
Commodity derivatives under the financial trading program      
Derivative      
Gain (loss) recognized in income on derivatives [1] (14,000,000) $ (36,000,000)  
Fair value [2] $ (20,000,000)   $ (39,000,000)
Coal Contract Derivatives      
Derivative      
Number of contracts 20   20
Notional amount 25,000,000   20,000,000
Fair value $ (104,000,000)   $ (127,000,000)
Natural Gas      
Derivative      
Number of contracts 34   39
Notional amount 198,000,000   148,000,000
Fair value $ 17,000,000   $ 2,000,000
Maximum | Coal Contract Derivatives      
Derivative      
Commodity derivatives term 2 years    
Maximum | Natural Gas      
Derivative      
Commodity derivatives term 4 years    
Natural Gas      
Derivative      
Fair value $ (20,000,000)   $ (39,000,000)
[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, 2016 and 2015.
[2] Fair values of certain derivatives under the FTP that were in net liability positions totaling $15 million and $30 million at December 31, 2016, and September 30, 2016, 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.