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Commitments, Guarantees and Contingencies (Details Textuals) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated	$ 1,700,000,000	$ 1,700,000,000
New syndicated senior secured term loan facility	362,000,000	$ 362,000,000
Curing period		30 days
Proposed goal to reduce CO2 pollution (percent)		90.00%
Nuclear plant decommissioning trusts	822,000,000	$ 822,000,000		$ 822,000,000
Clean Water Act
Guarantor Obligations [Line Items]
Waste water discharge permit renewal cycle		5 years
Regulation of Waste Disposal
Guarantor Obligations [Line Items]
Accrual for environmental loss contingencies	115,000,000	$ 115,000,000
Environmental liabilities former gas facilities	78,000,000	78,000,000
Regulated Distribution
Guarantor Obligations [Line Items]
Company posted collateral related to net liability positions	$ 10,000,000	$ 10,000,000
Global Holding | Senior Secured Term Loan | Senior Loans | Signal Peak, Global Rail and Affiliates
Guarantor Obligations [Line Items]
Investment ownership percentage	69.99%	69.99%
FEV | Senior Secured Term Loan | Senior Loans | Signal Peak | Global Holding
Guarantor Obligations [Line Items]
Investment ownership percentage	33.33%	33.33%
WMB Marketing Ventures, LLC | Senior Secured Term Loan | Senior Loans | Signal Peak | Global Holding
Guarantor Obligations [Line Items]
Investment ownership percentage	33.33%	33.33%
AE Supply
Guarantor Obligations [Line Items]
Company posted collateral related to net liability positions	$ 1,000,000	$ 1,000,000
New syndicated senior secured term loan facility	2,000,000	2,000,000
JCP&L, ME and PN | Nuclear Plant Matters | Financial Guarantee
Guarantor Obligations [Line Items]
Nuclear plant decommissioning trusts	800,000,000	800,000,000
Minimum | Clean Water Act
Guarantor Obligations [Line Items]
Capital investment required to install technology to meet TDS and Sulfate limits		150,000,000
Maximum | Clean Water Act
Guarantor Obligations [Line Items]
Capital investment required to install technology to meet TDS and Sulfate limits		300,000,000
FES and FENOC
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated	352,000,000	352,000,000
FE
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated	1,000,000,000	1,000,000,000
Other Guarantee
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated	220,000,000	220,000,000
Other Assurances
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated	141,000,000	141,000,000
Term Loan Facility Due March 2020 | Line of Credit | Global Holding
Guarantor Obligations [Line Items]
Face amount of debt	300,000,000	300,000,000	$ 300,000,000
Little Bull Run | Line of Credit | Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Maximum amount borrowed under revolving credit facility	169,000,000	169,000,000
Hatfield Ferry | Line of Credit | Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Maximum amount borrowed under revolving credit facility	31,000,000	$ 31,000,000
McElroy's Run Impoundment Site | Pleasants Power Station
Guarantor Obligations [Line Items]
Increase in asset retirement obligation	43,000,000
McElroy's Run Impoundment Site | Pleasants Power Station | AE Supply | Regulation of Waste Disposal
Guarantor Obligations [Line Items]
Increase in asset retirement obligation	$ 43,000,000

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