Consolidated Statements of Cash Flows (FirstEnergy Corp.) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME	$ 32	$ 494
Adjustments to reconcile net income to net cash from operating activities-
Provision for depreciation	596	564
Amortization of regulatory assets, net	131	137
Nuclear fuel amortization	98	106
Deferred purchased power and other costs	(39)	(149)
Deferred income taxes and investment tax credits, net	119	423
Impairments of long-lived assets	473	0
Investments impairments	53	7
Deferred rents and lease market valuation liability	(59)	(106)
Stock based compensation	(22)	(18)
Retirement benefits	(104)	(64)
Commodity derivative transactions, net (Note 9)	21	(86)
Pension trust contribution	0	(600)
Cash collateral, net	(42)	22
Loss on debt redemptions	141	0
Make-whole premiums paid on debt redemptions	(61)	0
Decrease (increase) in operating assets-
Receivables	(125)	(105)
Materials and supplies	42	(109)
Prepayments and other current assets	(185)	(117)
Increase (decrease) in operating liabilities-
Accounts payable	(329)	(122)
Accrued taxes	(199)	(192)
Accrued interest	2	(5)
Accrued compensation and retirement benefits	(34)	(96)
Other	(16)	78
Net cash provided from operating activities	493	62
New financing-
Long-term debt	2,245	182
Short-term borrowings, net	1,285	1,890
Redemptions and Repayments-
Long-term debt	(1,968)	(746)
Tender premiums paid on debt redemptions	(110)	0
Common stock dividend payments	(460)	(460)
Other	(16)	(35)
Net cash provided from (used for) financing activities	976	831
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(1,412)	(911)
Nuclear fuel	(50)	(90)
Sales of investment securities held in trusts	1,177	382
Purchases of investment securities held in trusts	(1,173)	(420)
Cash investments	(3)	87
Asset removal costs	(111)	(36)
Other	2	(13)
Net cash used for investing activities	(1,570)	(1,001)
Net change in cash and cash equivalents	(101)	(108)
Cash and cash equivalents at beginning of period	172	202
Cash and cash equivalents at end of period	$ 71	$ 94