XML 122 R68.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Debt and Other Obligations Debt and Other Obligations - General (Details) $ in Billions | 12 Months Ended
--- | ---
Sep. 30, 2016 USD ($) tests Types_of_bonds
Debt Instrument |
Debt ceiling | $ | $ 30.0
Number of types of bonds outstanding | Types_of_bonds | 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 | tests | 2
Time period for meeting the bondholder protection test | 5 years

X
- 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

X
- 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
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration