Consolidated Statements of Cash Flows (Unaudited) (FirstEnergy Solutions Corp.) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 919	$ 770
Adjustments to reconcile net income to net cash from operating activities-
Provision for depreciation	859	809
Nuclear fuel and lease amortization	163	152
Deferred rents and lease market valuation liability	(62)	(17)
Deferred income taxes and investment tax credits, net	712	696
Asset impairments	10	59
Accrued compensation and retirement benefits	(168)	(25)
Pension trust contribution	(600)	(375)
Commodity derivative transactions, net	(80)	(22)
Cash collateral, net	(3)	(66)
Decrease (increase) in operating assets-
Receivables	(41)	139
Materials and supplies	(63)	62
Prepayments and other current assets	(151)	(1)
Increase (decrease) in operating liabilities-
Accounts payable	(250)	(154)
Accrued taxes	(50)	20
Other	47	(7)
Net cash provided from operating activities	1,276	2,229
New financing-
Long-term debt	660	603
Short-term borrowings, net	1,604	0
Redemptions and Repayments-
Long-term debt	(870)	(1,581)
Short-term borrowings, net	0	(700)
Other	(42)	(73)
Net cash provided from (used for) financing activities	662	(2,402)
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(1,686)	(1,464)
Nuclear fuel	(207)	(65)
Proceeds from asset sales	17	519
Sales of investment securities held in trusts	2,133	3,678
Purchases of investment securities held in trusts	(2,188)	(3,801)
Other	(40)	(6)
Net cash used for investing activities	(1,990)	(555)
Net change in cash and cash equivalents	(52)	(728)
Cash and cash equivalents at beginning of period	202	1,019
Cash and cash equivalents at end of period	150	291
FES
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	222	194
Adjustments to reconcile net income to net cash from operating activities-
Provision for depreciation	203	207
Nuclear fuel and lease amortization	159	151
Deferred rents and lease market valuation liability	(144)	(37)
Deferred income taxes and investment tax credits, net	123	246
Asset impairments	8	40
Accrued compensation and retirement benefits	11	(31)
Pension trust contribution	(209)	0
Commodity derivative transactions, net	(67)	(54)
Cash collateral, net	(4)	(81)
Decrease (increase) in operating assets-
Receivables	95	(34)
Materials and supplies	(40)	72
Prepayments and other current assets	5	8
Increase (decrease) in operating liabilities-
Accounts payable	292	(113)
Accrued taxes	(144)	24
Other	(9)	(55)
Net cash provided from operating activities	501	537
New financing-
Long-term debt	560	247
Short-term borrowings, net	3	0
Redemptions and Repayments-
Long-term debt	(246)	(791)
Short-term borrowings, net	0	(12)
Other	(9)	(10)
Net cash provided from (used for) financing activities	308	(566)
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(535)	(408)
Nuclear fuel	(207)	(65)
Proceeds from asset sales	17	519
Sales of investment securities held in trusts	1,167	1,613
Purchases of investment securities held in trusts	(1,194)	(1,654)
Loans to affiliated companies, net	(55)	57
Other	(6)	(36)
Net cash used for investing activities	(813)	26
Net change in cash and cash equivalents	(4)	(3)
Cash and cash equivalents at beginning of period	7	9
Cash and cash equivalents at end of period	$ 3	$ 6