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Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Currency Swaps Outstanding (Details) (GBP £)
In Millions, unless otherwise specified
Sep. 30, 2013
Bond_issues
Derivative  
Number of British pound sterling denominated bond transactions 3
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%