Consolidated Balance Sheets (FirstEnergy Corp.) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
CURRENT ASSETS:
Cash and cash equivalents	$ 109	$ 218
Receivables-
Customers, net of allowance for uncollectible accounts of $55 in 2014 and $52 in 2013	1,869	1,720
Other, net of allowance for uncollectible accounts of $3 in 2014 and 2013	218	198
Materials and supplies, at average cost	740	752
Prepaid taxes	240	226
Derivatives	247	166
Accumulated deferred income taxes	375	366
Collateral	580	155
Other	199	212
Total current assets	4,577	4,013
PROPERTY, PLANT AND EQUIPMENT:
In service	44,782	44,228
Less - Accumulated provision for depreciation	13,555	13,280
Property, plant and equipment in service net of accumulated provision for depreciation	31,227	30,948
Construction work in progress	2,661	2,304
Total net property, plant and equipment	33,888	33,252
INVESTMENTS:
Nuclear plant decommissioning trusts	2,263	2,201
Other	898	903
Total other property and investments	3,161	3,104
ASSETS HELD FOR SALE	0	235
DEFERRED CHARGES AND OTHER ASSETS:
Goodwill	6,418	6,418
Regulatory assets	1,798	1,854
Other	1,386	1,548
Total deferred charges and other assets	9,602	9,820
Total assets	51,228	50,424
CURRENT LIABILITIES:
Currently payable long-term debt	1,416	1,415
Short-term borrowings	3,085	3,404
Accounts payable	1,455	1,250
Accrued taxes	527	485
Accrued compensation and benefits	232	351
Derivatives	159	111
Other	863	621
Total current liabilities	7,737	7,637
Common stockholders' equity-
Common stock, $0.10 par value, authorized 490,000,000 shares - 419,837,287 shares and 418,628,559 shares outstanding as of March 31, 2014 and December 31, 2013, respectively	42	42
Other paid-in capital	9,793	9,776
Accumulated other comprehensive income	271	284
Retained earnings	2,496	2,590
Total common stockholders' equity	12,602	12,692
Noncontrolling interest	3	3
Total equity	12,605	12,695
Long-term debt and other long-term obligations	16,804	15,831
Total capitalization	29,409	28,526
NONCURRENT LIABILITIES:
Accumulated deferred income taxes	7,028	6,968
Retirement benefits	2,713	2,689
Asset retirement obligations	1,704	1,678
Deferred gain on sale and leaseback transaction	850	858
Adverse power contract liability	255	290
Other	1,532	1,778
Total noncurrent liabilities	14,082	14,261
COMMITMENTS, GUARANTEES AND CONTINGENCIES (Note 10)
Total liabilities and capitalization	$ 51,228	$ 50,424