Segment Information - Financial Data (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Segment Financial Information
Revenues	[1]	$ 2,818		$ 2,622		$ 5,807	$ 5,348
Depreciation		348		323		688	646
Amortization (deferral) of regulatory assets, net		(129)		49		(166)	141
DPA penalty		0		230		0	230
Miscellaneous income (expense), net		160		108		266	243
Interest expense		265		287		540	572
Income taxes (benefits)		49		96		132	183
Net income		192	$ 288	58	$ 335	480	393
Income attributable to noncontrolling interest		5		0		5	0
Earnings attributable to FE		187		58		475	393
Property additions		627		622		1,147	1,226
Total assets		45,120				45,120		$ 45,432
Goodwill		5,618				5,618		5,618
External Customers
Segment Financial Information
Revenues		2,818		2,622		5,807	5,348
Internal Customers
Segment Financial Information
Revenues		0		0		0	0
Operating Segments | Regulated Distribution
Segment Financial Information
Revenues		2,426		2,258		5,015	4,628
Depreciation		242		229		477	455
Amortization (deferral) of regulatory assets, net		(127)		43		(165)	130
DPA penalty				0			0
Miscellaneous income (expense), net		94		88		179	195
Interest expense		128		131		257	259
Income taxes (benefits)		52		71		121	153
Net income		202		274		467	587
Income attributable to noncontrolling interest		0				0
Earnings attributable to FE		202				467
Property additions		356		346		673	667
Total assets		31,133				31,133		30,812
Goodwill		5,004				5,004		5,004
Operating Segments | Regulated Distribution | External Customers
Segment Financial Information
Revenues		2,370		2,208		4,902	4,529
Operating Segments | Regulated Distribution | Internal Customers
Segment Financial Information
Revenues		56		50		113	99
Operating Segments | Regulated Transmission
Segment Financial Information
Revenues		441		419		894	824
Depreciation		87		77		173	158
Amortization (deferral) of regulatory assets, net		(2)		6		(1)	11
DPA penalty				0			0
Miscellaneous income (expense), net		7		11		13	22
Interest expense		55		63		114	124
Income taxes (benefits)		39		37		80	70
Net income		128		116		253	225
Income attributable to noncontrolling interest		5				5
Earnings attributable to FE		123				248
Property additions		267		257		464	530
Total assets		13,303				13,303		13,237
Goodwill		614				614		614
Operating Segments | Regulated Transmission | External Customers
Segment Financial Information
Revenues		440		411		891	812
Operating Segments | Regulated Transmission | Internal Customers
Segment Financial Information
Revenues		1		8		3	12
Corporate/Other
Segment Financial Information
Revenues		8		3		14	7
Depreciation		1		1		3	2
Amortization (deferral) of regulatory assets, net		0		0		0	0
DPA penalty				230			230
Miscellaneous income (expense), net		65		14		82	36
Interest expense		88		98		177	199
Income taxes (benefits)		(42)		(12)		(69)	(40)
Net income		(138)		(332)		(240)	(419)
Income attributable to noncontrolling interest		0				0
Earnings attributable to FE		(138)				(240)
Property additions		4		19		10	29
Total assets		684				684		1,383
Goodwill		0				0		0
Corporate/Other | External Customers
Segment Financial Information
Revenues		8		3		14	7
Corporate/Other | Internal Customers
Segment Financial Information
Revenues		0		0		0	0
Reconciling Adjustments
Segment Financial Information
Revenues		(57)		(58)		(116)	(111)
Depreciation		18		16		35	31
Amortization (deferral) of regulatory assets, net		0		0		0	0
DPA penalty				0			0
Miscellaneous income (expense), net		(6)		(5)		(8)	(10)
Interest expense		(6)		(5)		(8)	(10)
Income taxes (benefits)		0		0		0	0
Net income		0		0		0	0
Income attributable to noncontrolling interest		0				0
Earnings attributable to FE		0				0
Property additions		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		$ (57)		$ (58)		$ (116)	$ (111)

[1] Includes excise and gross receipts tax collections of $91 million and $85 million during the three months ended June 30, 2022 and 2021, respectively, and $194 million and $180 million during the six months ended June 30, 2022 and 2021, respectively.