Consolidated Statements of Cash Flows (FirstEnergy Corp.) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME	$ 299us-gaap_ProfitLoss	$ 392us-gaap_ProfitLoss	$ 771us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash from operating activities-
Provision for depreciation	1,220us-gaap_Depreciation	1,202us-gaap_Depreciation	1,119us-gaap_Depreciation
Asset removal costs charged to income	28fe_RemovalCosts	20fe_RemovalCosts	203fe_RemovalCosts
Amortization (deferral) of regulatory assets, net	12us-gaap_AmortizationOfRegulatoryAsset	539us-gaap_AmortizationOfRegulatoryAsset	(68)us-gaap_AmortizationOfRegulatoryAsset
Nuclear fuel amortization	220us-gaap_AmortizationOfNuclearFuelLease	209us-gaap_AmortizationOfNuclearFuelLease	210us-gaap_AmortizationOfNuclearFuelLease
Amortization of deferred costs on sale leaseback transaction, net	48	48	48
Amortization of customer intangibles assets and deferred advertising costs	60	18	18
Deferred purchased power and other costs	(115)fe_DeferredPurchasedPowerCostsAndOther	(76)fe_DeferredPurchasedPowerCostsAndOther	(238)fe_DeferredPurchasedPowerCostsAndOther
Deferred income taxes and investment tax credits, net	162	243	647
Impairments of long-lived assets	0us-gaap_AssetImpairmentCharges	795us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Investment impairments	37fe_ImpairmentOfInvestmentsHeld	90fe_ImpairmentOfInvestmentsHeld	27fe_ImpairmentOfInvestmentsHeld
Pension and OPEB mark-to-market adjustment	835	(256)	609
Retirement benefits	(53)	(168)	(127)
Gain on asset sales	0us-gaap_GainLossOnSaleOfOtherAssets	(21)us-gaap_GainLossOnSaleOfOtherAssets	(17)us-gaap_GainLossOnSaleOfOtherAssets
Commodity derivative transactions, net (Note 10)	64	(3)	(102)
Pension trust contributions	0us-gaap_PensionContributions	0us-gaap_PensionContributions	(600)us-gaap_PensionContributions
Gain on sale of investment securities held in trusts	(64)us-gaap_GainLossOnSaleOfInvestments	(56)us-gaap_GainLossOnSaleOfInvestments	(71)us-gaap_GainLossOnSaleOfInvestments
Loss on debt redemptions	8	132	0
Make-whole premiums paid on debt redemptions	0	(187)	0
Lease payments on sale and leaseback transaction	(137)	(136)	(186)
Income from discontinued operations (Note 19)	(86)	(17)	(16)
Decrease (increase) in operating assets-
Receivables	139	(114)	(13)
Materials and supplies	(65)us-gaap_IncreaseDecreaseInInventories	96us-gaap_IncreaseDecreaseInInventories	(50)us-gaap_IncreaseDecreaseInInventories
Prepayments and other current assets	126	(126)	(12)
Increase (decrease) in operating liabilities-
Accounts payable	42	(25)	100
Accrued taxes	(165)	85	(2)
Accrued interest	31	(10)	(12)
Accrued compensation and benefits	(22)	19	(55)
Cash collateral, net	(54)	(36)	12
Other	143	5	125
Net cash provided from operating activities	2,713	2,662	2,320
New Financing-
Long-term debt	4,528	3,745	750
Short-term borrowings, net	0us-gaap_ProceedsFromShortTermDebt	1,435us-gaap_ProceedsFromShortTermDebt	1,969us-gaap_ProceedsFromShortTermDebt
Redemptions and Repayments-
Long-term debt	(1,759)us-gaap_RepaymentsOfLongTermDebt	(3,600)us-gaap_RepaymentsOfLongTermDebt	(940)us-gaap_RepaymentsOfLongTermDebt
Short-term borrowings, net	(1,605)us-gaap_RepaymentsOfShortTermDebt	0us-gaap_RepaymentsOfShortTermDebt	0us-gaap_RepaymentsOfShortTermDebt
Tender premiums paid on debt redemptions	0	(110)	0
Common stock dividend payments	(604)us-gaap_PaymentsOfDividendsCommonStock	(920)us-gaap_PaymentsOfDividendsCommonStock	(920)us-gaap_PaymentsOfDividendsCommonStock
Other	(47)	(73)	(52)
Net cash provided from (used for) financing activities	513	477	807
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(3,312)	(2,638)	(2,678)
Nuclear fuel	(233)us-gaap_PaymentsForNuclearFuel	(250)us-gaap_PaymentsForNuclearFuel	(286)us-gaap_PaymentsForNuclearFuel
Proceeds from asset sales	394	4	17
Sales of investment securities held in trusts	2,133	2,047	2,980
Purchases of investment securities held in trusts	(2,236)	(2,096)	(3,020)
Cash investments	35	(23)	102
Asset removal costs	(153)us-gaap_PaymentsForRemovalCosts	(146)us-gaap_PaymentsForRemovalCosts	(229)us-gaap_PaymentsForRemovalCosts
Other	13	9	(43)
Net cash used for investing activities	(3,359)	(3,093)	(3,157)
Net change in cash and cash equivalents	(133)	46	(30)
Cash and cash equivalents at beginning of period	218	172	202
Cash and cash equivalents at end of period	85	218	172
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest (net of amounts capitalized)	931us-gaap_InterestPaidNet	969us-gaap_InterestPaidNet	962us-gaap_InterestPaidNet
Income taxes (received), net of refunds	$ (103)us-gaap_IncomeTaxesPaidNet	$ 36us-gaap_IncomeTaxesPaidNet	$ (6)us-gaap_IncomeTaxesPaidNet

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Costs of power used for operations in prior periods that were expected to be recovered from customers in future periods and other charges not defined elsewhere in the taxonomy.

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This element represents the amortization of deferred leasing fees incurred by the lessor and amortized over the term of the lease. Such fees represent (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction.

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The expense charged against earnings for the periodic recognition of capitalized nuclear fuel leases.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of deferred income tax expense (benefit) and income tax credits.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The increase (decrease) during the reporting period in the amount due from customers for the credit sale of goods and services; includes accounts receivable and other types of receivables.

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Change in recurring obligations of a business that arise from the acquisition of merchandise, materials, supplies and services used in the production and sale of goods and services.

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The increase (decrease) during the reporting period in monies given as security or collateral for items acquired or borrowed on a temporary basis. Deposits may also be paid as initial payment of the cost of acquisition or for the right to enter into a contract or agreement.

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The increase (decrease) during the reporting period in the aggregate amount of obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits.

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The increase (decrease) during the reporting period in the value of prepaid expenses and other assets not separately disclosed in the statement of cash flows, for example, deferred expenses, intangible assets, or income taxes.

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The increase (decrease) in cash associated with the entity's continuing operating, investing, and financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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