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Risk Management Activities and Derivative Transactions Derivative Instruments That Receive Hedge Accounting Treatment (Details) - USD ($)
 3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Summary of Derivative Instruments That Receive Hedge Accounting Treatment    
Net unrealized gain (loss) on cash flow hedges $ (27,000,000) $ (15,000,000)
Reclassification to earnings from cash flow hedges [1] (24,000,000) (38,000,000)
Ineffective portion excluded from testing 0 $ 0
Reclassification to earnings from cash flow hedges in the next 12 months $ 44,000,000  
Reclassification to earnings from cash flow hedges estimated time to transfer 12 months  
[1] There were no ineffective portions or amounts excluded from effectiveness testing for any of the periods presented. Based on forecasted foreign currency exchange rates, TVA expects to reclassify approximately $44 million of losses from AOCI to interest expense within the next twelve months to offset amounts anticipated to be recorded in interest expense related to exchange gain on the debt.