Consolidated Balance Sheets (FirstEnergy Corp.) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
CURRENT ASSETS:
Cash and cash equivalents	$ 222	$ 172
Receivables-
Customers, net of allowance for uncollectible accounts of $41 in 2013 and $40 in 2012	1,579	1,614
Other, net of allowance for uncollectible accounts of $3 in 2013 and $4 in 2012	231	315
Materials and supplies, at average cost	731	861
Prepaid taxes	104	119
Derivatives	140	160
Accumulated deferred income taxes	290	319
Other	262	208
Total current assets	3,559	3,768
PROPERTY, PLANT AND EQUIPMENT:
In service	44,089	43,210
Less - Accumulated provision for depreciation	13,167	12,600
Property, plant and equipment in service net of accumulated provision for depreciation	30,922	30,610
Construction work in progress	2,301	2,293
Total net property, plant and equipment	33,223	32,903
INVESTMENTS:
Nuclear plant decommissioning trusts	2,183	2,204
Investments in lease obligation bonds	46	54
Other	876	936
Total other property and investments	3,105	3,194
ASSETS HELD FOR SALE, NET (NOTE 16):	234	0
DEFERRED CHARGES AND OTHER ASSETS:
Goodwill	6,418	6,447
Regulatory assets	2,146	2,375
Other	1,698	1,719
Total deferred charges and other assets	10,262	10,541
Total assets	50,383	50,406
CURRENT LIABILITIES:
Currently payable long-term debt	1,889	1,999
Short-term borrowings	3,404	1,969
Accounts payable	995	1,599
Accrued taxes	401	543
Accrued compensation and benefits	289	331
Derivatives	105	126
Other	872	1,038
Total current liabilities	7,955	7,605
Common stockholders' equity-
Common stock, $0.10 par value, authorized 490,000,000 shares - 418,216,437 shares outstanding	42	42
Other paid-in capital	9,755	9,769
Accumulated other comprehensive income	299	385
Retained earnings	2,448	2,888
Total common stockholders' equity	12,544	13,084
Noncontrolling interest	3	9
Total equity	12,547	13,093
Long-term debt and other long-term obligations	15,291	15,179
Total capitalization	27,838	28,272
NONCURRENT LIABILITIES:
Accumulated deferred income taxes	6,603	6,616
Retirement benefits	3,104	3,080
Asset retirement obligations	1,834	1,599
Deferred gain on sale and leaseback transaction	866	892
Adverse power contract liability	467	506
Other	1,716	1,836
Total noncurrent liabilities	14,590	14,529
COMMITMENTS, GUARANTEES AND CONTINGENCIES (Note 13)
Total liabilities and capitalization	$ 50,383	$ 50,406