Consolidated Balance Sheets (FirstEnergy Solutions 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 $14 in 2013 and $16 in 2012	1,579	1,614
Other, net of allowance for uncollectible accounts of $3 in 2013 and $2 in 2012	231	315
Materials and supplies	731	861
Derivatives	140	160
Prepayments and 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
Other	876	936
Total other property and investments	3,105	3,194
ASSETS HELD FOR SALE (NOTE 16)	234	0
DEFERRED CHARGES AND OTHER ASSETS:
Goodwill	6,418	6,447
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-
Accrued taxes	401	543
Derivatives	105	126
Other	872	1,038
Total current liabilities	7,955	7,605
Common stockholders' equity-
Common stock, without par value, authorized 750 shares- 7 shares outstanding	42	42
Accumulated other comprehensive income	299	385
Retained earnings	2,448	2,888
Total common stockholders' equity	12,544	13,084
Long-term debt and other long-term obligations	15,291	15,179
Total capitalization	27,838	28,272
NONCURRENT LIABILITIES:
Deferred gain on sale and leaseback transaction	866	892
Accumulated deferred income taxes	6,603	6,616
Asset retirement obligations	1,834	1,599
Retirement benefits	3,104	3,080
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
FES
CURRENT ASSETS:
Cash and cash equivalents	2	3
Receivables-
Customers, net of allowance for uncollectible accounts of $14 in 2013 and $16 in 2012	524	483
Affiliated companies	519	379
Other, net of allowance for uncollectible accounts of $3 in 2013 and $2 in 2012	123	91
Notes receivable from affiliated companies	254	276
Materials and supplies	439	505
Derivatives	139	158
Prepayments and other	105	87
Total current assets	2,105	1,982
PROPERTY, PLANT AND EQUIPMENT:
In service	12,508	11,997
Less - Accumulated provision for depreciation	4,649	4,408
Property, plant and equipment in service net of accumulated provision for depreciation	7,859	7,589
Construction work in progress	1,116	1,141
Total net property, plant and equipment	8,975	8,730
INVESTMENTS:
Nuclear plant decommissioning trusts	1,270	1,283
Other	11	12
Total other property and investments	1,281	1,295
ASSETS HELD FOR SALE (NOTE 16)	121	0
DEFERRED CHARGES AND OTHER ASSETS:
Customer intangibles	99	110
Goodwill	23	24
Property taxes	36	36
Unamortized sale and leaseback costs	161	119
Derivatives	65	99
Other	268	253
Total deferred charges and other assets	652	641
Total assets	13,134	12,648
CURRENT LIABILITIES:
Currently payable long-term debt	859	1,102
Short-term borrowings	4	4
Accounts payable-
Affiliated companies	776	726
Other	213	159
Accrued taxes	42	171
Derivatives	103	124
Other	176	280
Total current liabilities	2,173	2,566
Common stockholders' equity-
Common stock, without par value, authorized 750 shares- 7 shares outstanding	3,078	1,573
Accumulated other comprehensive income	62	72
Retained earnings	2,089	2,118
Total common stockholders' equity	5,229	3,763
Long-term debt and other long-term obligations	2,178	3,118
Total capitalization	7,407	6,881
NONCURRENT LIABILITIES:
Deferred gain on sale and leaseback transaction	866	892
Accumulated deferred income taxes	699	515
Asset retirement obligations	1,159	965
Retirement benefits	255	241
Derivatives	22	37
Other	553	551
Total noncurrent liabilities	3,554	3,201
COMMITMENTS, GUARANTEES AND CONTINGENCIES (Note 13)
Total liabilities and capitalization	$ 13,134	$ 12,648