Consolidated Balance Sheets (Ohio Edison Company) (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	315	269
Prepayments and other	176	122
Total current assets	3,768	3,355
UTILITY PLANT:
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
OTHER PROPERTY AND INVESTMENTS:
Investments in lease obligation bonds	54	402
Nuclear plant decommissioning trusts	2,204	2,112
Other	936	1,008
Total other property and investments	3,194	3,522
DEFERRED CHARGES AND OTHER ASSETS:
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
Accounts payable-
Accrued taxes	543	558
Other	1,038	900
Total current liabilities	7,605	4,855
Common stockholders' equity-
Common stock	42	42
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
Other	1,836	2,072
Total noncurrent liabilities	14,529	13,456
COMMITMENTS AND CONTINGENCIES (Note 15)
Total liabilities and capitalization	50,406	47,326
OE
CURRENT ASSETS:
Cash and cash equivalents	50	26
Receivables-
Customers, net of allowance for uncollectible accounts	176	163
Affiliated companies	54	86
Other	17	41
Notes receivable from affiliated companies	307	181
Prepayments and other	4	17
Total current assets	608	514
UTILITY PLANT:
In service	3,596	3,358
Less - Accumulated provision for depreciation	1,310	1,267
Property, plant and equipment in service net of accumulated provision for depreciation	2,286	2,091
Construction work in progress	124	91
Total net property, plant and equipment	2,410	2,182
OTHER PROPERTY AND INVESTMENTS:
Investments in lease obligation bonds	132	163
Nuclear plant decommissioning trusts	141	137
Other	93	90
Total other property and investments	366	390
DEFERRED CHARGES AND OTHER ASSETS:
Regulatory assets	268	363
Property taxes	90	81
Unamortized sale and leaseback costs	20	25
Other	20	19
Total deferred charges and other assets	398	488
Total assets	3,782	3,574
CURRENT LIABILITIES:
Currently payable long-term debt	4	2
Accounts payable-
Affiliated companies	194	119
Other	35	35
Accrued taxes	100	88
Accrued interest	25	25
Other	80	79
Total current liabilities	438	348
Common stockholders' equity-
Common stock	658	747
Accumulated other comprehensive income	45	54
Retained earnings (accumulated deficit)	17	(84)
Total common stockholders' equity	720	717
Noncontrolling interest	4	5
Total equity	724	722
Long-term debt and other long-term obligations	1,172	1,155
Total capitalization	1,896	1,877
NONCURRENT LIABILITIES:
Accumulated deferred income taxes	767	787
Retirement benefits	283	213
Asset retirement obligations	76	71
Other	322	278
Total noncurrent liabilities	1,448	1,349
COMMITMENTS AND CONTINGENCIES (Note 15)
Total liabilities and capitalization	$ 3,782	$ 3,574