v3.25.1
FAIR VALUE MEASUREMENTS - Schedule of Fair Value and Related Carrying Amounts of Long-term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Carrying value    
Fair value and related carrying amounts of long-term debt and other long-term obligations    
Long-term debt and other long-term obligations $ 23,270 $ 23,594
Carrying value | JERSEY CENTRAL POWER & LIGHT COMPANY    
Fair value and related carrying amounts of long-term debt and other long-term obligations    
Long-term debt and other long-term obligations 2,350 2,350
Fair value    
Fair value and related carrying amounts of long-term debt and other long-term obligations    
Long-term debt and other long-term obligations 22,097 22,128
Fair value | JERSEY CENTRAL POWER & LIGHT COMPANY    
Fair value and related carrying amounts of long-term debt and other long-term obligations    
Long-term debt and other long-term obligations $ 2,308 $ 2,284