Consolidated Statements of Cash Flows (FirstEnergy 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
Amortization of regulatory assets, net	59	75
Nuclear fuel and lease amortization	53	58
Deferred purchased power and other costs	(25)	(107)
Deferred income taxes and investment tax credits, net	134	265
Investments impairments	7	4
Deferred rents and lease market valuation liability	37	(23)
Retirement benefits	(64)	(39)
Commodity derivative transactions, net	4	(64)
Pension trust contribution	0	(600)
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 interest	53	70
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)
Common stock dividend payments	(230)	(230)
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)
Cash investments	6	78
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