Consolidated Statements of Cash Flows (Unaudited) (FirstEnergy Corp.) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 494	$ 240
Provision for depreciation	577	512
Adjustments to reconcile net income to net cash from operating activities-
Amortization of regulatory assets, net	137	222
Nuclear fuel and lease amortization	106	92
Deferred purchased power and other costs	(149)	(168)
Deferred income taxes and investment tax credits, net	423	598
Deferred rents and lease market valuation liability	(106)	(61)
Stock based compensation	(18)	(4)
Accrued compensation and retirement benefits	(160)	(31)
Commodity derivative transactions, net	(86)	(21)
Pension trust contribution	(600)	(262)
Asset impairments	7	41
Cash collateral, net	22	(31)
Decrease (increase) in operating assets-
Receivables	(105)	199
Materials and supplies	(109)	24
Prepayments and other current assets	(117)	(268)
Increase (decrease) in operating liabilities-
Accounts payable	(122)	(28)
Accrued taxes	(192)	(66)
Accrued interest	(5)	(4)
Other	65	47
Net cash provided from operating activities	62	1,031
New financing-
Long-term debt	182	503
Short-term borrowings, net	1,890	0
Redemptions and Repayments-
Long-term debt	(746)	(1,002)
Short-term borrowings, net	0	(44)
Common stock dividend payments	(460)	(420)
Other	(35)	(76)
Net cash provided from (used for) financing activities	831	(1,039)
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(1,001)	(1,018)
Sales of investment securities held in trusts	382	1,703
Purchases of investment securities held in trusts	(420)	(1,807)
Cash investments	87	50
Cash received in Allegheny merger	0	590
Other	(49)	(53)
Net cash used for investing activities	(1,001)	(535)
Net change in cash and cash equivalents	(108)	(543)
Cash and cash equivalents at beginning of period	202	1,019
Cash and cash equivalents at end of period	94	476
SUPPLEMENTAL CASH FLOW INFORMATION:
Non-cash transaction: merger with Allegheny, common stock issued	$ 0	$ 4,354