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Risk Management Activities and Derivative Transactions Currency Swaps Outstanding (Details) (GBP £) In Millions, unless otherwise specified	Apr. 15, 2012	Mar. 31, 2013 1999 Currency Swap Contract	Mar. 31, 2013 2001 Currency Swap Contract	Mar. 31, 2013 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%

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

No definition available.

+ Details

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- Definition

Effective Date of Currency Swap Contract

+ References

No definition available.

+ Details

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Namespace Prefix:	tve_
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Balance Type:	na
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- Definition

Expiration Date of Swap

+ References

No definition available.

+ Details

Name:	tve_ExpirationDateOfSwap
Namespace Prefix:	tve_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	instant

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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