SEGMENT INFORMATION- Financial Data (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Segment Financial Information
Revenues	[1]	$ 3,006	$ 2,818	$ 6,237	$ 5,807
Depreciation		361	348	722	688
Deferral of regulatory assets, net		(33)	(129)	(113)	(166)
Equity method investment earnings		35	65	91	77
Interest expense		276	265	539	540
Income taxes (benefits)		74	49	164	132
Earnings attributable to FE		235	187	527	475
Capital investments		769	647	1,418	1,186
Total assets		47,065		47,065		$ 46,108
Goodwill		5,618		5,618		5,618
External Customers
Segment Financial Information
Revenues		3,006	2,818	6,237	5,807
Internal Customers
Segment Financial Information
Revenues		0	0	0	0
Operating Segments | Regulated Distribution
Segment Financial Information
Revenues		2,542	2,426	5,368	5,015
Depreciation		255	242	506	477
Deferral of regulatory assets, net		(34)	(127)	(113)	(165)
Equity method investment earnings		0	0	0	0
Interest expense		151	128	297	257
Income taxes (benefits)		44	52	100	121
Earnings attributable to FE		177	202	413	467
Capital investments		393	376	727	712
Total assets		32,201		32,201		31,749
Goodwill		5,004		5,004		5,004
Operating Segments | Regulated Distribution | External Customers
Segment Financial Information
Revenues		2,484	2,370	5,253	4,902
Operating Segments | Regulated Distribution | Internal Customers
Segment Financial Information
Revenues		58	56	115	113
Operating Segments | Regulated Transmission
Segment Financial Information
Revenues		520	441	981	894
Depreciation		88	87	179	173
Deferral of regulatory assets, net		1	(2)	0	(1)
Equity method investment earnings		0	0	0	0
Interest expense		61	55	120	114
Income taxes (benefits)		46	39	86	80
Earnings attributable to FE		134	123	248	248
Capital investments		365	267	673	464
Total assets		14,199		14,199		13,835
Goodwill		614		614		614
Operating Segments | Regulated Transmission | External Customers
Segment Financial Information
Revenues		519	440	979	891
Operating Segments | Regulated Transmission | Internal Customers
Segment Financial Information
Revenues		1	1	2	3
Corporate/Other
Segment Financial Information
Revenues		(56)	(49)	(112)	(102)
Depreciation		1	1	3	3
Deferral of regulatory assets, net		0	0	0	0
Equity method investment earnings		35	65	91	77
Interest expense		82	88	157	177
Income taxes (benefits)		(16)	(42)	(22)	(69)
Earnings attributable to FE		(76)	(138)	(134)	(240)
Capital investments		11	4	18	10
Total assets		665		665		524
Goodwill		0		0		0
Corporate/Other | External Customers
Segment Financial Information
Revenues		3	8	5	14
Corporate/Other | Internal Customers
Segment Financial Information
Revenues		0	0	0	0
Reconciling Adjustments
Segment Financial Information
Depreciation		17	18	34	35
Deferral of regulatory assets, net		0	0	0	0
Equity method investment earnings		0	0	0	0
Interest expense		(18)	(6)	(35)	(8)
Income taxes (benefits)		0	0	0	0
Earnings attributable to FE		0	0	0	0
Capital investments		0	0	0	0
Total assets		0		0		0
Goodwill		0		0		$ 0
Reconciling Adjustments | External Customers
Segment Financial Information
Revenues		0	0	0	0
Reconciling Adjustments | Internal Customers
Segment Financial Information
Revenues		$ (59)	$ (57)	$ (117)	$ (116)

[1] Includes excise and gross receipts tax collections of $92 million and $91 million during the three months ended June 30, 2023 and 2022, respectively, and $201 million and $194 million during the six months ended June 30, 2023 and 2022, respectively.