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Debt and Other Obligations Putable Automatic Rate Reset Securities (Details) (USD $) In Millions, unless otherwise specified | Jun. 01, 2013 | May 01, 2013 | Mar. 31, 2013
--- | --- | --- | ---
Debt Instrument |  |  |
PARRS interest rate prior to rate reset | 4.06% | 4.15% |
PARRS interest rate after rate reset | 3.83% | 3.96% |
Reclass from long-term to current maturities |  |  | $ 271
Repurchased face amount |  | $ 1 |

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- Definition The PARRS interest rate after rate reset. + References No definition available. + Details
Name: | tve_ParrsInterestRateAfterRateReset
Namespace Prefix: | tve_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The PARRS interest rate prior to rate reset. + References No definition available. + Details
Name: | tve_ParrsInterestRatePriorToRateReset
Namespace Prefix: | tve_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The amount that was reclassed from long-term to current maturities. + References No definition available. + Details
Name: | tve_ReclassFromLongTermToCurrentMaturities
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of the original debt instrument that was repurchased. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant