Consolidated Statements of Cash Flows (FirstEnergy Solutions Corp.) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME (LOSS)	$ 328	$ 222
Adjustments to reconcile net income (loss) to net cash from operating activities-
Depreciation and amortization, including nuclear fuel, regulatory assets, net, and customer intangible asset amortization	455	425
Deferred costs on sale and leaseback transaction, net	(12)	(12)
Deferred income taxes and investment tax credits, net	206	127
Commodity derivative transactions, net	(64)	2
Changes in current assets and liabilities-
Receivables	1	(97)
Materials and supplies	4	30
Prepayments and other current assets	(82)	(116)
Accounts payable	25	(177)
Accrued taxes	(110)	(80)
Accrued compensation and benefits	(102)	(80)
Other current liabilities	19	11
Cash collateral, net	(6)	(15)
Other	59	63
Net cash provided from operating activities	638	193
New financing-
Short-term borrowings, net	425	760
Redemptions and Repayments-
Long-term debt	(31)	(48)
Net cash provided from (used for) financing activities	242	560
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(698)	(668)
Nuclear fuel	(149)	(60)
Sales of investment securities held in trusts	465	371
Purchases of investment securities held in trusts	(488)	(394)
Cash investments	30	21
Other	9	10
Net cash used for investing activities	(865)	(748)
Net change in cash and cash equivalents	15	5
Cash and cash equivalents at beginning of period	131	85
Cash and cash equivalents at end of period	146
FES
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME (LOSS)	131	(3)
Adjustments to reconcile net income (loss) to net cash from operating activities-
Depreciation and amortization, including nuclear fuel, regulatory assets, net, and customer intangible asset amortization	138	144
Deferred costs on sale and leaseback transaction, net	(12)	(12)
Deferred income taxes and investment tax credits, net	113	34
Investment impairments	8	6
Commodity derivative transactions, net	(64)	1
Changes in current assets and liabilities-
Receivables	2	1
Materials and supplies	24	21
Prepayments and other current assets	(12)	(18)
Accounts payable	(103)	(75)
Accrued taxes	(15)	(24)
Accrued compensation and benefits	(11)	(9)
Other current liabilities	18	8
Cash collateral, net	(10)	12
Other	(3)	(5)
Net cash provided from operating activities	228	105
New financing-
Short-term borrowings, net	49	150
Redemptions and Repayments-
Long-term debt	0	(17)
Other	(2)	(2)
Net cash provided from (used for) financing activities	47	131
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(143)	(119)
Nuclear fuel	(149)	(60)
Sales of investment securities held in trusts	138	189
Purchases of investment securities held in trusts	(151)	(202)
Cash investments	10	0
Loans to affiliated companies, net	11	(44)
Other	9	0
Net cash used for investing activities	(275)	(236)
Net change in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	2	2
Cash and cash equivalents at end of period	$ 2	$ 2