Consolidated Statements of Cash Flows (FirstEnergy Solutions 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
Nuclear fuel amortization	98	106
Deferred rents and lease market valuation liability	(59)	(106)
Deferred income taxes and investment tax credits, net	119	423
Investments impairments	53	7
Retirement benefits	(104)	(64)
Pension trust contribution	0	(600)
Commodity derivative transactions, net (Note 9)	21	(86)
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 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
Redemptions and Repayments-
Long-term debt	(1,968)	(746)
Tender premiums paid on debt redemptions	(110)	0
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)
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
FES
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME	(69)	121
Adjustments to reconcile net income to net cash from operating activities-
Provision for depreciation	154	132
Nuclear fuel amortization	98	103
Deferred rents and lease market valuation liability	(56)	(103)
Deferred income taxes and investment tax credits, net	141	162
Investments impairments	45	6
Retirement benefits	(3)	1
Pension trust contribution	0	(209)
Commodity derivative transactions, net (Note 9)	22	(53)
Cash collateral, net	(3)	17
Loss on debt redemptions	103	0
Make-whole premiums paid on debt redemptions	(31)	0
Decrease (increase) in operating assets-
Receivables	(156)	0
Materials and supplies	52	(56)
Prepayments and other current assets	(40)	19
Increase (decrease) in operating liabilities-
Accounts payable	(104)	243
Accrued taxes	(131)	(167)
Accrued compensation and retirement benefits	3	13
Other	(25)	(10)
Net cash provided from operating activities	0	219
New financing-
Long-term debt	0	82
Equity contribution from parent	1,500	0
Redemptions and Repayments-
Long-term debt	(1,179)	(140)
Tender premiums paid on debt redemptions	(67)	0
Other	(5)	(6)
Net cash provided from (used for) financing activities	249	(64)
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(350)	(213)
Nuclear fuel	(50)	(90)
Proceeds from asset sales	19	17
Sales of investment securities held in trusts	487	109
Purchases of investment securities held in trusts	(515)	(127)
Loans to affiliated companies, net	156	155
Other	3	(6)
Net cash used for investing activities	(250)	(155)
Net change in cash and cash equivalents	(1)	0
Cash and cash equivalents at beginning of period	3	7
Cash and cash equivalents at end of period	$ 2	$ 7