Cover Page - shares	6 Months Ended
	Jun. 30, 2024	Aug. 13, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2024
Document Transition Report	false
Entity File Number	001-37388
Entity Registrant Name	Talen Energy Corporation
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-1197305
Entity Address, Address Line One	2929 Allen Pkwy, Suite 2200
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77019
City Area Code	888
Local Phone Number	211-6011
Title of 12(b) Security	Common stock, par value $0.001 per share
Trading Symbol	TLN
Security Exchange Name	NASDAQ
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		51,001,450
Entity Central Index Key	0001622536
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q2
Amendment Flag	false