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Risk Management Activities and Derivative Transactions Derivative Instruments That Receive Hedge Accounting Treatment (Details) (USD $)
 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Summary of Derivative Instruments That Receive Hedge Accounting Treatment    
Net unrealized gain (loss) on cash flow hedges $ 20,000,000 $ 33,000,000
Reclassification to earnings from cash flow hedges (22,000,000) [1] (5,000,000) [1]
Ineffective portion excluded from testing 0 0
Reclassification to earnings from cash flow hedges in the future $ 51,000,000  
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 $51 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.