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Commitment and Contingencies - Resolved Legal Matters (Details)
$ in Millions
1 Months Ended
Jul. 31, 2024
USD ($)
Sep. 30, 2023
USD ($)
Nov. 30, 2020
member
employee
Other Commitments [Line Items]      
Number of employees that filed a lawsuit | employee     4
Number of former retirement plan committee members | member     10
Talen vs TES, TEC, the TERP, and the TERP committee | Settled Litigation      
Other Commitments [Line Items]      
Amount awarded   $ 20  
Talen vs TES, TEC, the TERP, and the TERP committee | Settled Litigation | Subsequent Event      
Other Commitments [Line Items]      
Legal settlements and litigation costs $ 14