Consolidated Balance Sheets (FirstEnergy Solutions 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
Derivatives	192	235
Prepayments and 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
Other	936	1,008
Total other property and investments	3,194	3,522
DEFERRED CHARGES AND OTHER ASSETS:
Customer intangibles	702
Goodwill	6,447	6,441
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
Derivatives	126	218
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
Long-term debt and other long-term obligations	15,179	15,716
Total capitalization	28,272	29,015
NONCURRENT LIABILITIES:
Deferred gain on sale and leaseback transaction	892	925
Accumulated deferred income taxes	6,616	5,670
Asset retirement obligations	1,599	1,497
Retirement benefits	3,080	2,823
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
FES
CURRENT ASSETS:
Cash and cash equivalents	3	7
Receivables-
Customers, net of allowance for uncollectible accounts	483	424
Affiliated companies	379	600
Other, net of allowance for uncollectible accounts	91	61
Notes receivable from affiliated companies	276	383
Materials and supplies	505	492
Derivatives	190	219
Prepayments and other	55	38
Total current assets	1,982	2,224
PROPERTY, PLANT AND EQUIPMENT:
In service	11,997	10,983
Less - Accumulated provision for depreciation	4,408	4,110
Property, plant and equipment in service net of accumulated provision for depreciation	7,589	6,873
Construction work in progress	1,141	1,014
Total net property, plant and equipment	8,730	7,887
INVESTMENTS:
Nuclear plant decommissioning trusts	1,283	1,223
Other	12	7
Total other property and investments	1,295	1,230
DEFERRED CHARGES AND OTHER ASSETS:
Customer intangibles	110	123
Goodwill	24	24
Property taxes	36	43
Unamortized sale and leaseback costs	119	80
Derivatives	99	79
Other	253	129
Total deferred charges and other assets	641	478
Total assets	12,648	11,819
CURRENT LIABILITIES:
Currently payable long-term debt	1,102	905
Accounts payable-
Affiliated companies	726	436
Other	159	220
Accrued taxes	171	227
Derivatives	124	189
Other	284	261
Total current liabilities	2,566	2,238
Common stockholders' equity-
Common stock	1,573	1,570
Accumulated other comprehensive income	72	76
Retained earnings (accumulated deficit)	2,118	1,931
Total common stockholders' equity	3,763	3,577
Long-term debt and other long-term obligations	3,118	2,799
Total capitalization	6,881	6,376
NONCURRENT LIABILITIES:
Deferred gain on sale and leaseback transaction	892	925
Accumulated deferred income taxes	515	286
Asset retirement obligations	965	904
Retirement benefits	241	356
Lease market valuation liability	0	171
Other	588	563
Total noncurrent liabilities	3,201	3,205
COMMITMENTS, GUARANTEES AND CONTINGENCIES (Note 15)
Total liabilities and capitalization	$ 12,648	$ 11,819