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Debt and Other Obligations Debt and Other Obligations - General (Details) (USD $) In Billions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 tests Types_of_bonds
Debt Instrument |
Debt ceiling | $ 30.0
Number of types of bonds outstanding | 2
Power bonds years to maturity - low end of range | 1 year
Power bonds years to maturity - high end of range | 50 years
Discount notes years to maturity - high end of range | 1 year
Number of bond tests | 2
Time period for meeting the bondholder protection test | 5 years

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- Definition The cap on the amount of bonds the company can have outstanding. + References No definition available. + Details
Name: | tve_DebtCeiling
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Discount notes years to maturity - high end of range + References No definition available. + Details
Name: | tve_Discountnotesyearstomaturityhighendofrange
Namespace Prefix: | tve_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of bond tests: the rate test and the bondholder protection test + References No definition available. + Details
Name: | tve_NumberOfBondTests
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of types of bonds outstanding. + References No definition available. + Details
Name: | tve_NumberOfTypesOfBondsOutstanding
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Power bonds years to maturity - high end of range + References No definition available. + Details
Name: | tve_Powerbondsyearstomaturityhighendofrange
Namespace Prefix: | tve_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Power bonds years to maturity - low end of range + References No definition available. + Details
Name: | tve_Powerbondsyearstomaturitylowendofrange
Namespace Prefix: | tve_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Time period for meeting the bondholder protection test + References No definition available. + Details
Name: | tve_Timeperiodformeetingthebondholderprotectiontest
Namespace Prefix: | tve_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

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