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Commitments, Guarantees and Contingencies (Details Textuals)			1 Months Ended	3 Months Ended
	Oct. 01, 2015	Aug. 03, 2015 T	Jun. 30, 2014	Mar. 31, 2017 USD ($) phase installment T	Mar. 31, 2016	Dec. 31, 2016 USD ($)	Oct. 31, 2012 USD ($)
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated				$ 3,300,000,000
New syndicated senior secured term loan facility				$ 419,000,000
Proposed goal to reduce CO2 pollution (percent)				90.00%
Nuclear plant decommissioning trusts				$ 2,571,000,000		$ 2,514,000,000
Clean Water Act
Guarantor Obligations [Line Items]
Waste water discharge permit renewal cycle					5 years
Regulation of Waste Disposal
Guarantor Obligations [Line Items]
Bond closure and post closure period				45 years
Period to complete closure				12 years
Accrual for environmental loss contingencies				$ 135,000,000
Environmental liabilities former gas facilities				89,000,000
Nuclear Plant Matters
Guarantor Obligations [Line Items]
Nuclear plant decommissioning trusts				2,600,000,000
Parental guarantee				$ 24,500,000
Renewal length of operating license for Davis-Besse Nuclear Power Station				20 years
Caa Compliance
Guarantor Obligations [Line Items]
Amount remaining under contract \| T				5,500,000
National Ambient Air Quality Standards
Guarantor Obligations [Line Items]
Capping of SO2 emissions under CSAPR \| T				2,400,000
Capping of NOx emissions under CSAPR \| T				1,200,000
National Ambient Air Quality Standards \| CSAPR
Guarantor Obligations [Line Items]
Number of phases under the EPA’s CAIR for reductions of Sulfur Dioxide and Mono-Nitrogen Oxides \| phase				2
Settled Litigation \| Caa Compliance
Guarantor Obligations [Line Items]
Loss recognized in period				$ 164,000,000
Regulated Distribution
Guarantor Obligations [Line Items]
Company posted collateral related to net liability positions				4,000,000
FES
Guarantor Obligations [Line Items]
Company posted collateral related to net liability positions				115,000,000
New syndicated senior secured term loan facility				241,000,000
Nuclear plant decommissioning trusts				1,593,000,000		1,552,000,000
FES \| Caa Compliance
Guarantor Obligations [Line Items]
Annual contested damage claim				$ 70,000,000
Period of annual contested damage claim				11 years
FES \| Settled Litigation \| Caa Compliance
Guarantor Obligations [Line Items]
Loss recognized in period				$ 164,000,000
FES \| Competitive Energy Services
Guarantor Obligations [Line Items]
New syndicated senior secured term loan facility				2,000,000
Global Holding \| Senior Secured Term Loan \| Senior Loans
Guarantor Obligations [Line Items]
New syndicated senior secured term loan facility				$ 300,000,000			$ 350,000,000
Global Holding \| Senior Secured Term Loan \| Senior Loans \| Signal Peak, Global Rail and Affiliates
Guarantor Obligations [Line Items]
Investment ownership percentage				69.99%
FEV \| Senior Secured Term Loan \| Senior Loans \| Signal Peak \| Global Holding
Guarantor Obligations [Line Items]
Investment ownership percentage				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%
FG \| Settled Litigation \| Caa Compliance
Guarantor Obligations [Line Items]
Settlement amount				$ 109,000,000
NG \| Nuclear Plant Matters
Guarantor Obligations [Line Items]
Nuclear plant decommissioning trusts						10,000,000
AE Supply
Guarantor Obligations [Line Items]
Company posted collateral related to net liability positions				4,000,000
New syndicated senior secured term loan facility				28,000,000
Environmental Protection Agency \| Caa Compliance
Guarantor Obligations [Line Items]
Period of time to implement plan	3 years
Minimum \| Clean Water Act
Guarantor Obligations [Line Items]
Maximum capital investment required to install technology to meet TDS and Sulfate limits				$ 150,000,000
Minimum \| FES \| Caa Compliance
Guarantor Obligations [Line Items]
Number of installment payments \| installment				3
Maximum \| Clean Water Act
Guarantor Obligations [Line Items]
Maximum capital investment required to install technology to meet TDS and Sulfate limits				$ 300,000,000
Maximum \| State and Local Agencies \| Climate Change
Guarantor Obligations [Line Items]
Potential MATS extension period			2 years
Certain Coal-Fired Power Plant \| FG \| Mercury and Air Toxic Standards
Guarantor Obligations [Line Items]
Minimum coal supply commitment (ton) \| T		3,500,000.0
Another Coal-Fired Power Plant \| FG \| Mercury and Air Toxic Standards
Guarantor Obligations [Line Items]
Minimum coal supply commitment (ton) \| T		2,500,000.0
FirstEnergy
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated				582,000,000
Subsidiaries
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated				1,900,000,000
Other Guarantee
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated				300,000,000
Other Assurances
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated				456,000,000
Line of Credit \| Revolving Credit Facility
Guarantor Obligations [Line Items]
Maximum amount borrowed under revolving credit facility				500,000,000
Line of Credit \| Revolving Credit Facility \| Nuclear Plant Matters
Guarantor Obligations [Line Items]
Maximum amount borrowed under revolving credit facility				500,000,000
NG \| Financial Guarantee \| FES \| Nuclear Plant Matters
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated				$ 400,000,000		$ 400,000,000