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Risk Management Activities and Derivative Transactions Currency Swaps Outstanding (Details)
£ in Millions
 3 Months Ended
Jun. 30, 2016
GBP (£)
1999 Currency Swap Contract  
Derivative  
Effective Date of Currency Swap Contract 1999
Associated TVA bond issues currency exposure £ 200
Expiration Date of Swap 2021
Overall effective cost to TVA 5.81%
2001 Currency Swap Contract  
Derivative  
Effective Date of Currency Swap Contract 2001
Associated TVA bond issues currency exposure £ 250
Expiration Date of Swap 2032
Overall effective cost to TVA 6.59%
2003 Currency Swap Contract  
Derivative  
Effective Date of Currency Swap Contract 2003
Associated TVA bond issues currency exposure £ 150
Expiration Date of Swap 2043
Overall effective cost to TVA 4.96%