Basis of Presentation and Summary of Significant Accounting Policies (Details)	1 Months Ended	9 Months Ended
May 31, 2022 subsidiary	Sep. 30, 2024 USD ($) Rate
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of subsidiaries \| subsidiary	71
Nuclear PTC Program, multiplier \| Rate		500.00%
Nuclear PTC Program, maximum dollars per MWh \| $		$ 15

Nuclear Production Tax Credit Program, Multiplier Per MWh, Maximum

No definition available.

Name:	tln_NuclearProductionTaxCreditProgramMultiplierPerMWhMaximum
Namespace Prefix:	tln_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration