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Commitments, Guarantees and Contingencies (Details Textuals)			6 Months Ended
	Apr. 06, 2018 USD ($)	May 01, 2017 USD ($) installment	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated			$ 1,700,000,000
New syndicated senior secured term loan facility			$ 352,000,000
Curing period			30 days
Proposed goal to reduce CO2 pollution (percent)			90.00%
Nuclear plant decommissioning trusts			$ 806,000,000	$ 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			$ 116,000,000
Environmental liabilities former gas facilities			78,000,000
Nuclear Plant Matters
Guarantor Obligations [Line Items]
Nuclear plant decommissioning trusts			800,000,000
Regulated Distribution
Guarantor Obligations [Line Items]
Company posted collateral related to net liability positions			$ 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%
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
Number of installment payments | installment		3
Settlement payments	$ 72,000,000
AE Supply
Guarantor Obligations [Line Items]
Company posted collateral related to net liability positions			$ 2,000,000
New syndicated senior secured term loan facility			2,000,000
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			354,000,000
FE
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated			1,000,000,000
Other Guarantee
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated			235,000,000
Other Assurances
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated			128,000,000
Term Loan Facility Due March 2020 [Member] | Line of Credit | Global Holding
Guarantor Obligations [Line Items]
Face amount of debt			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
Hatfield Ferry | Line of Credit | Surety Bond (Collateralized Amount)
Guarantor Obligations [Line Items]
Maximum amount borrowed under revolving credit facility			$ 31,000,000

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