Consolidated Statements of Cash Flows (FirstEnergy Corp.) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ (1,724)	$ (6,177)	$ 578
Adjustments to reconcile net income (loss) to net cash from operating activities-
Depreciation and amortization, including nuclear fuel, intangible assets and deferred debt-related costs	1,700	1,974	1,826
Impairment of assets and related charges (Note 2)	2,406	10,665	42
Investment impairments, including equity method investments	13	21	464
Pension and OPEB mark-to-market adjustment	141	147	242
Deferred income taxes and investment tax credits, net	839	(3,063)	284
Deferred costs on sale leaseback transaction, net	49	49	48
Asset removal costs charged to income	22	54	55
Retirement benefits, net of payments	29	64	(20)
Unrealized (gain) loss on derivative transactions (Note 11)	81	9	(73)
Pension trust contributions	0	(382)	(143)
Gain on sale of investment securities held in trusts	(63)	(50)	(23)
Lease payments on sale and leaseback transaction	(73)	(120)	(131)
Changes in current assets and liabilities-
Receivables	(39)	(11)	184
Materials and supplies	(6)	41	(15)
Prepaid taxes and other	30	27	(10)
Accounts payable	72	(37)	(243)
Accrued taxes	(9)	61	29
Accrued compensation and benefits	(27)	29	5
Other current liabilities	20	56	69
Cash collateral, net	27	(116)	140
Other	320	142	152
Net cash provided from operating activities	3,808	3,383	3,460
New Financing-
Long-term debt	4,675	1,976	1,311
Short-term borrowings, net	0	975	0
Redemptions and Repayments-
Long-term debt	(2,291)	(2,331)	(879)
Short-term borrowings, net	(2,375)	0	(91)
Common stock dividend payments	(639)	(611)	(607)
Other	(72)	(43)	(26)
Net cash used for financing activities	(702)	(34)	(292)
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(2,587)	(2,835)	(2,704)
Nuclear fuel	(254)	(232)	(190)
Proceeds from asset sales	388	15	20
Sales of investment securities held in trusts	2,170	1,678	1,534
Purchases of investment securities held in trusts	(2,268)	(1,789)	(1,648)
Asset removal costs	(172)	(145)	(142)
Other	7	27	8
Net cash used for investing activities	(2,716)	(3,281)	(3,122)
Net change in cash and cash equivalents	390	68	46
Cash and cash equivalents at beginning of period	199	131	85
Cash and cash equivalents at end of period	589	199	131
SUPPLEMENTAL CASH FLOW INFORMATION:
Non-cash transaction: stock contribution to pension plan	0	500	0
Interest (net of amounts capitalized)	1,039	1,050	1,028
Income taxes, net of refunds	$ 53	$ (16)	$ 37