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Debt and Other Obligations Debt and Other Obligations - Put and Call Options (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 Bond_issues PARRS_issues
Debt Instrument |
Amount of redeemable bond issues outstanding | $ 515
Call price | 100.00%
Bond issues with survivor's option | 15
Bonds outstanding with survivor's option | 375
Number of issues of Putable Automatic Rate Reset Securities outstanding | 2
Fixed-rate period for coupon rate reset on PARRS | 5 years
Average time period | 5 days
PARRS 1998 Series D Bond |
Debt Instrument |
Amount of redeemable bond issues outstanding | 324
Debt Instrument, Basis Point Spread on Variable Rate | 94
Number of rate resets | 6
PARRS interest rate prior to rate reset | 6.75%
PARRS interest rate after rate reset | 3.83%
Amount of bonds redeemed | 251
PARRS 1999 Series A Bond |
Debt Instrument |
Amount of redeemable bond issues outstanding | 270
Debt Instrument, Basis Point Spread on Variable Rate | 84
Number of rate resets | 5
PARRS interest rate prior to rate reset | 6.50%
PARRS interest rate after rate reset | 3.955%
Amount of bonds redeemed | $ 255

X
- Definition The amount of bonds redeemed. + References No definition available. + Details
Name: | tve_AmountOfBondsRedeemed
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of redeemable bond issues outstanding + References No definition available. + Details
Name: | tve_AmountOfRedeemableBondIssuesOutstanding
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Average time period + References No definition available. + Details
Name: | tve_Averagetimeperiod
Namespace Prefix: | tve_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of bond issues which include a "survivor's option" allowing for the right of redemption upon the death of a beneficial owner in certain specified circumstances. + References No definition available. + Details
Name: | tve_BondIssuesWithSurvivorsOption
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of bonds outstanding which include a "survivor's option" allowing for the right of redemption upon the death of a beneficial owner in certain specified circumstances. + References No definition available. + Details
Name: | tve_BondsOutstandingWithSurvivorsOption
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Call price - low end of range. Shown as a percent of principal amount. + References No definition available. + Details
Name: | tve_CallPricePercent
Namespace Prefix: | tve_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Basis points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | tve_DebtInstrumentBasisPointSpreadonVariableRate
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fixed-rate period for coupon rate reset on PARRS + References No definition available. + Details
Name: | tve_FixedrateperiodforcouponrateresetonPARRS
Namespace Prefix: | tve_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of issues of Putable Automatic Rate Reset Securities outstanding + References No definition available. + Details
Name: | tve_NumberOfIssuesOfPutableAutomaticRateResetSecuritiesOutstanding
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of times the coupon rate has been reset. + References No definition available. + Details
Name: | tve_NumberOfRateResets
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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