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Risk Management Activities and Derivative Transactions Currency Swaps Outstanding (Details) (GBP £)
In Millions, unless otherwise specified
Apr. 15, 2012
Dec. 31, 2012
1999 Currency Swap Contract
Dec. 31, 2012
2001 Currency Swap Contract
Dec. 31, 2012
2003 Currency Swap Contract
Derivative        
Effective date of currency swap contract   1999 2001 2003
Associated TVA bond issues currency exposure   £ 200 £ 250 £ 150
Expiration date of swap   2021 2032 2043
Overall effective cost to TVA 8.25% 5.81% 6.59% 4.96%