Consolidated Balance Sheets (FirstEnergy Corp.) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS:
Cash and cash equivalents	$ 67	$ 172
Receivables-
Customers, net of allowance for uncollectible accounts	1,631	1,614
Other, net of allowance for uncollectible accounts	227	315
Materials and supplies, at average cost	835	861
Prepaid taxes	252	119
Derivatives	183	160
Accumulated deferred income taxes	90	319
Other	214	208
Total current assets	3,499	3,768
PROPERTY, PLANT AND EQUIPMENT:
In service	43,748	43,210
Less - Accumulated provision for depreciation	12,823	12,600
Property, plant and equipment in service net of accumulated provision for depreciation	30,925	30,610
Construction work in progress	2,361	2,293
Total net property, plant and equipment	33,286	32,903
INVESTMENTS:
Nuclear plant decommissioning trusts	2,227	2,204
Investments in lease obligation bonds	54	54
Other	934	936
Total other property and investments	3,215	3,194
DEFERRED CHARGES AND OTHER ASSETS:
Goodwill	6,447	6,447
Regulatory assets	2,312	2,375
Other	1,665	1,719
Total deferred charges and other assets	10,424	10,541
Total assets	50,424	50,406
CURRENT LIABILITIES:
Currently payable long-term debt	2,296	1,999
Short-term borrowings	2,150	1,969
Accounts payable	982	1,599
Accrued taxes	392	543
Accrued compensation and benefits	240	331
Derivatives	126	126
Other	946	1,038
Total current liabilities	7,132	7,605
Common stockholders' equity-
Common stock	42	42
Other paid-in capital	9,739	9,769
Accumulated other comprehensive income	361	385
Retained earnings (accumulated deficit)	2,854	2,888
Total common stockholders' equity	12,996	13,084
Noncontrolling interest	4	9
Total equity	13,000	13,093
Long-term debt and other long-term obligations	15,814	15,179
Total capitalization	28,814	28,272
NONCURRENT LIABILITIES:
Accumulated deferred income taxes	6,542	6,616
Retirement benefits	3,070	3,080
Asset retirement obligations	1,767	1,599
Deferred gain on sale and leaseback transaction	883	892
Adverse power contract liability	465	506
Other	1,751	1,836
Total noncurrent liabilities	14,478	14,529
COMMITMENTS, GUARANTEES AND CONTINGENCIES (Note 11)
Total liabilities and capitalization	$ 50,424	$ 50,406