Consolidated Balance Sheets (FirstEnergy Corp.) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
CURRENT ASSETS:
Cash and cash equivalents	$ 172	$ 202
Receivables-
Customers, net of allowance for uncollectible accounts	1,614	1,525
Other, net of allowance for uncollectible accounts	315	269
Materials and supplies	861	811
Prepaid taxes	119	191
Derivatives	192	235
Accumulated deferred income taxes	319	0
Other	176	122
Total current assets	3,768	3,355
PROPERTY, PLANT AND EQUIPMENT:
In service	43,210	40,122
Less - Accumulated provision for depreciation	12,600	11,839
Property, plant and equipment in service net of accumulated provision for depreciation	30,610	28,283
Construction work in progress	2,293	2,054
Total net property, plant and equipment	32,903	30,337
INVESTMENTS:
Nuclear plant decommissioning trusts	2,204	2,112
Investments in lease obligation bonds	54	402
Other	936	1,008
Total other property and investments	3,194	3,522
DEFERRED CHARGES AND OTHER ASSETS:
Goodwill	6,447	6,441
Regulatory assets	2,375	2,030
Other	1,719	1,641
Total deferred charges and other assets	10,541	10,112
Total assets	50,406	47,326
CURRENT LIABILITIES:
Currently payable long-term debt	1,999	1,621
Short-term borrowings	1,969	0
Accounts payable	1,599	1,174
Accrued taxes	543	558
Accrued compensation and benefits	331	384
Derivatives	126	218
Other	1,038	900
Total current liabilities	7,605	4,855
Common stockholders' equity-
Common stock	42	42
Other paid-in capital	9,769	9,765
Accumulated other comprehensive income	385	426
Retained earnings (accumulated deficit)	2,888	3,047
Total common stockholders' equity	13,084	13,280
Noncontrolling interest	9	19
Total equity	13,093	13,299
Long-term debt and other long-term obligations	15,179	15,716
Total capitalization	28,272	29,015
NONCURRENT LIABILITIES:
Accumulated deferred income taxes	6,616	5,670
Retirement benefits	3,080	2,823
Asset retirement obligations	1,599	1,497
Deferred gain on sale and leaseback transaction	892	925
Adverse power contract liability	506	469
Other	1,836	2,072
Total noncurrent liabilities	14,529	13,456
COMMITMENTS, GUARANTEES AND CONTINGENCIES (Note 15)
Total liabilities and capitalization	$ 50,406	$ 47,326