Consolidated Statements of Cash Flows (Unaudited) (FirstEnergy 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
Amortization of regulatory assets, net	198	344
Nuclear fuel and lease amortization	163	152
Deferred purchased power and other costs	(214)	(222)
Deferred income taxes and investment tax credits, net	712	696
Deferred rents and lease market valuation liability	(62)	(17)
Accrued compensation and retirement benefits	(168)	(25)
Commodity derivative transactions, net	(80)	(22)
Pension trust contribution	(600)	(375)
Asset impairments	10	59
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
Accrued interest	50	67
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)
Common stock dividend payments	(690)	(651)
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)
Cash investments	100	51
Cash received in Allegheny merger	0	590
Cost of removal	(119)	(57)
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
SUPPLEMENTAL CASH FLOW INFORMATION:
Non-cash transaction: merger with Allegheny, common stock issued	$ 0	$ 4,354