Consolidated Statements of Cash Flows (FirstEnergy Solutions Corp.) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME	$ 196	$ 306
Adjustments to reconcile net income to net cash from operating activities-
Provision for depreciation	294	279
Nuclear fuel and lease amortization	53	58
Deferred rents and lease market valuation liability	37	(23)
Deferred income taxes and investment tax credits, net	134	265
Investments impairments	7	4
Retirement benefits	(64)	(39)
Pension trust contribution	0	(600)
Commodity derivative transactions, net	4	(64)
Cash collateral, net	(1)	(28)
Loss on debt redemptions	119	0
Decrease (increase) in operating assets-
Receivables	(34)	59
Materials and supplies	26	(118)
Prepayments and other current assets	(159)	(19)
Increase (decrease) in operating liabilities-
Accounts payable	(385)	(256)
Accrued taxes	(126)	(116)
Accrued compensation and retirement benefits	(91)	(123)
Other	(47)	(36)
Net cash provided from operating activities	50	(413)
New financing-
Long-term debt	1,800	0
Short-term borrowings, net	181	1,075
Redemptions and Repayments-
Long-term debt	(956)	(16)
Other	(23)	(10)
Net cash provided from (used for) financing activities	772	819
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(826)	(517)
Nuclear fuel	(27)	(72)
Sales of investment securities held in trusts	539	251
Purchases of investment securities held in trusts	(565)	(266)
Other	(54)	(8)
Net cash used for investing activities	(927)	(534)
Net change in cash and cash equivalents	(105)	(128)
Cash and cash equivalents at beginning of period	172	202
Cash and cash equivalents at end of period	67	74
FES
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME	2	122
Adjustments to reconcile net income to net cash from operating activities-
Provision for depreciation	76	63
Nuclear fuel and lease amortization	53	57
Deferred rents and lease market valuation liability	21	(47)
Deferred income taxes and investment tax credits, net	56	83
Investments impairments	7	3
Retirement benefits	(4)	(1)
Pension trust contribution	0	(209)
Commodity derivative transactions, net	3	(52)
Cash collateral, net	38	(25)
Loss on debt redemptions	73	0
Decrease (increase) in operating assets-
Receivables	(177)	28
Materials and supplies	28	(59)
Prepayments and other current assets	(55)	14
Increase (decrease) in operating liabilities-
Accounts payable	(191)	17
Accrued taxes	(78)	(155)
Accrued compensation and retirement benefits	(16)	(9)
Other	(31)	(8)
Net cash provided from operating activities	(195)	(178)
New financing-
Short-term borrowings, net	702	0
Redemptions and Repayments-
Long-term debt	(543)	0
Short-term borrowings, net	0	0
Other	(1)	(3)
Net cash provided from (used for) financing activities	158	(3)
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(217)	(109)
Nuclear fuel	(27)	(72)
Proceeds from asset sales	17	0
Sales of investment securities held in trusts	252	83
Purchases of investment securities held in trusts	(265)	(90)
Loans to affiliated companies, net	276	371
Other	1	(2)
Net cash used for investing activities	37	181
Net change in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	3	7
Cash and cash equivalents at end of period	$ 3	$ 7