Consolidated Statements of Cash Flows (FirstEnergy Solutions 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 (loss) to net cash from operating activities-
Provision for depreciation	1,220us-gaap_Depreciation	1,202us-gaap_Depreciation	1,119us-gaap_Depreciation
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 income taxes and investment tax credits, net	162	243	647
Investment impairments	37fe_ImpairmentOfInvestmentsHeld	90fe_ImpairmentOfInvestmentsHeld	27fe_ImpairmentOfInvestmentsHeld
Pension and OPEB mark-to-market adjustment	835	(256)	609
Pension trust contributions	0us-gaap_PensionContributions	0us-gaap_PensionContributions	(600)us-gaap_PensionContributions
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Gain on asset sales	0us-gaap_GainLossOnSaleOfOtherAssets	(21)us-gaap_GainLossOnSaleOfOtherAssets	(17)us-gaap_GainLossOnSaleOfOtherAssets
Commodity derivative transactions, net (Note 10)	64	(3)	(102)
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 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
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)
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
Cash paid (received) during the year-
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
FES
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME	(244)	60	187
Adjustments to reconcile net income (loss) to net cash from operating activities-
Provision for depreciation	319	306	272
Nuclear fuel amortization	220	209	210
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 income taxes and investment tax credits, net	7	309	214
Investment impairments	33	79	14
Pension and OPEB mark-to-market adjustment	297	(81)	166
Pension trust contributions	0	0	(209)
Gain on sale of investment securities held in trusts	(61)	(49)	(65)
Gain on asset sales	0	(20)	(17)
Commodity derivative transactions, net (Note 10)	65	5	(74)
Loss on debt redemptions	6	103	0
Make-whole premiums paid on debt redemptions	0	(31)	0
Lease payments on sale and leaseback transaction	(131)	(131)	(182)
Income from discontinued operations (Note 19)	(116)	(14)	(14)
Decrease (increase) in operating assets-
Receivables	674	(393)	135
Materials and supplies	(44)	57	(13)
Prepayments and other current assets	14	(39)	(18)
Increase (decrease) in operating liabilities-
Accounts payable	(477)	(145)	240
Accrued taxes	(50)	(207)	(64)
Accrued compensation and benefits	(11)	2	8
Cash collateral, net	(92)	(34)	(33)
Other	54	26	(2)
Net cash provided from operating activities	571	78	821
New financing-
Long-term debt	878	0	650
Short-term borrowings, net	0	431	3
Equity contribution from parent	500	1,500	0
Redemptions and Repayments-
Long-term debt	(816)	(1,202)	(429)
Short-term borrowings, net	(301)	0	0
Tender premiums paid on debt redemptions	0	(67)	0
Other	(15)	(9)	(12)
Net cash provided from (used for) financing activities	246	653	212
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(839)	(717)	(795)
Nuclear fuel	(233)	(250)	(286)
Proceeds from asset sales	307	21	17
Sales of investment securities held in trusts	1,163	940	1,464
Purchases of investment securities held in trusts	(1,219)	(1,000)	(1,502)
Loans to affiliated companies, net	0	276	107
Other	4	(2)	(42)
Net cash used for investing activities	(817)	(732)	(1,037)
Net change in cash and cash equivalents	0	(1)	(4)
Cash and cash equivalents at beginning of period	2	3	7
Cash and cash equivalents at end of period	2	2	3
Cash paid (received) during the year-
Interest (net of amounts capitalized)	118	157	174
Income taxes (received), net of refunds	$ (384)	$ 23	$ 72

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example, cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).

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Cash outflow associated with the purchase of any material that is commonly used in the generation of nuclear energy.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open agreements to purchase or sell mineral resources, energy, and agricultural products at some future point held at each balance sheet date, that was included in earnings for the period.

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