v3.25.2
Cover
Jul. 17, 2025
Cover [Abstract]  
Document Type 8-K
Document Period End Date Jul. 17, 2025
Entity Registrant Name Talen Energy Corporation
Entity Incorporation, State or Country Code DE
Entity File Number 001-37388
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common stock, par value $0.001 per share
Trading Symbol TLN
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Amendment Flag false
Entity Central Index Key 0001622536
Statement of Financial Position [Abstract]  
Document Period End Date Jul. 17, 2025