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Debt and Other Obligations Debt and Other Obligations - General (Details) (USD $) In Billions, unless otherwise specified | Sep. 30, 2015 | Sep. 30, 2013 tests Types_of_bonds | Sep. 30, 2010
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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 | 5 years | 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: | instant

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

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- 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: | instant

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: | instant

X
- Definition Must meet the bondholder protection test in each successive time period. + References No definition available. + Details
Name: | tve_TimePeriodForMeetingBondholderProtectionTest
Namespace Prefix: | tve_
Data Type: | us-types:durationStringItemType
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