v3.26.1
ORGANIZATION AND BASIS OF PRESENTATION - Schedule of Error Corrections related to Statement of Income and Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Deferral of regulatory assets, net $ (225)   $ (99)   $ (682) $ (109)
Other operating expenses 1,165   995   2,625 2,029
Total operating expenses 3,001   2,734   6,375 5,745
Operating income 677   646   1,505 1,400
Income before income taxes 444   406   1,048 946
Income taxes 92   88   230 214
Net income 352 $ 466 318 $ 414 818 732
JCP&L            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Deferral of regulatory assets, net (76)   (12)   (182) (32)
Other operating expenses [1] 194   137   418 282
Total operating expenses 536   499   1,100 993
Operating income 123   93   225 165
Income before income taxes 105   82   193 145
Income taxes 26   20   48 36
Net income $ 79   62   $ 145 109
Comprehensive income     62     109
As Reported | JCP&L            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Deferral of regulatory assets, net     (14)     (36)
Other operating expenses     133     278
Total operating expenses     493     985
Operating income     99     173
Income before income taxes     88     153
Income taxes     22     38
Net income     66     115
Comprehensive income     66     115
Adjustment | JCP&L            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Deferral of regulatory assets, net     2     4
Other operating expenses     4     4
Total operating expenses     6     8
Operating income     (6)     (8)
Income before income taxes     (6)     (8)
Income taxes     (2)     (2)
Net income     (4)     (6)
Comprehensive income     $ (4)     $ (6)
[1] Includes affiliated operating expenses of $25 million and $26 million for the three months ended June 30, 2026, and 2025, respectively, and $57 million and $59 million for the six months ended June 30, 2026, and 2025, respectively.