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Organization and Basis of Presentation - Narrative (Details) mi in Thousands, customer in Thousands, $ in Millions		3 Months Ended		9 Months Ended
	May 31, 2022 USD ($) director	Sep. 30, 2022 USD ($) company transmissionCenter MW	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) customer company transmissionCenter mi MW	Sep. 30, 2021 USD ($)
Property, Plant and Equipment [Line Items]
Length of transmission lines | mi				24
Number of regional transmission centers | transmissionCenter		2		2
Capitalized cost of equity		$ 15	$ 13	$ 39	$ 34
Capitalized interest		$ 8	$ 7	$ 20	$ 20
PN | Waverly, New York
Property, Plant and Equipment [Line Items]
Number of customers served by utility operating companies | customer				4
FET
Property, Plant and Equipment [Line Items]
Transaction costs	$ 37
Changes in carrying value of noncontrolling interest	$ 451
Number of directors | director	5
Minimum ownership interest	9.90%
Year one through five required debt to equity percentage	65.00%
Required debt to equity ratio thereafter	70.00%
FET | North American Transmission Company II LLC
Property, Plant and Equipment [Line Items]
Sale of ownership interest by parent	19.90%
Sale price of ownership interest by parent	$ 2,375
Number of directors | director	1
FET | FirstEnergy
Property, Plant and Equipment [Line Items]
Number of directors | director	4
Regulated Distribution
Property, Plant and Equipment [Line Items]
Number of existing utility operating companies | company		10		10
Number of customers served by utility operating companies | customer				6,000
Plant capacity (in MW's) | MW		3,580		3,580

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