Name:	tln_ConcentrationRiskCreditRiskFinInstrumentMaximumExposure
Namespace Prefix:	tln_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

Name:	tln_CreditConcentrationAssociatedWithFinancialInstrumentsNumericAbstract
Namespace Prefix:	tln_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Reflects the dollar exposure of credit risk to the top ten energy trading counterparties.

No definition available.

Name:	tln_DollarExposureToTopTenCounterparties
Namespace Prefix:	tln_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Reflects the amount of loss due to credit risk with energy trading partners after considering netting arrangements and collateral.

No definition available.

Name:	tln_FairValueConcentrationOfCreditRiskAfterMasterNettingCollateralArrangements
Namespace Prefix:	tln_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Reflects the number of top ten energy trading counterparties, which the company has credit risk exposure, that have an investment grade credit rating.

No definition available.

Name:	tln_NumberOfCounterpartiesInTopTenWithInvestmentGradeRating
Namespace Prefix:	tln_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Reflects the percentage exposure of credit risk to the top ten energy trading counterparties.

No definition available.

Name:	tln_PercentageExposureToTopTenCounterparties
Namespace Prefix:	tln_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The energy trading counterparties in top ten that have an investment grade credit rating, reflected as a percentage of the top ten's credit risk exposure.

No definition available.

Name:	tln_PercentageOfCounterpartiesInTopTenWithInvestmentGradeRating
Namespace Prefix:	tln_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611

Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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.

No definition available.