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Risk Management Activities and Derivative Transactions Derivative Instruments That Receive Hedge Accounting Treatment (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Summary of Derivative Instruments That Receive Hedge Accounting Treatment        
Net unrealized gain (loss) on cash flow hedges $ (90,000,000) $ 62,000,000 $ (144,000,000) $ (12,000,000)
Reclassification to earnings from cash flow hedges [1] 63,000,000 (53,000,000) 109,000,000 31,000,000
Ineffective portion excluded from testing $ 0 $ 0 0 $ 0
Reclassification to earnings from cash flow hedges in the next 12 months     $ 35,000,000  
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 $35 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.