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Debt and Other Obligations Debt and Other Obligations - General (Details) (USD $) In Billions, unless otherwise specified	12 Months Ended
	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

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

- Details

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