Consolidated Balance Sheets (FirstEnergy Solutions Corp.) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
CURRENT ASSETS:
Cash and cash equivalents	$ 109	$ 218
Receivables-
Customers, net of allowance for uncollectible accounts of $13 in 2014 and $11 in 2013	1,869	1,720
Other, net of allowance for uncollectible accounts of $3 in 2014 and 2013	218	198
Materials and supplies	740	752
Derivatives	247	166
Collateral	580	155
Prepayments and other	199	212
Total current assets	4,577	4,013
PROPERTY, PLANT AND EQUIPMENT:
In service	44,782	44,228
Less - Accumulated provision for depreciation	13,555	13,280
Property, plant and equipment in service net of accumulated provision for depreciation	31,227	30,948
Construction work in progress	2,661	2,304
Total net property, plant and equipment	33,888	33,252
INVESTMENTS:
Nuclear plant decommissioning trusts	2,263	2,201
Other	898	903
Total other property and investments	3,161	3,104
ASSETS HELD FOR SALE	0	235
DEFERRED CHARGES AND OTHER ASSETS:
Goodwill	6,418	6,418
Other	1,386	1,548
Total deferred charges and other assets	9,602	9,820
Total assets	51,228	50,424
CURRENT LIABILITIES:
Currently payable long-term debt	1,416	1,415
Other	3,085	3,404
Accounts payable-
Accrued taxes	527	485
Derivatives	159	111
Other	863	621
Total current liabilities	7,737	7,637
Common stockholders' equity-
Common stock, without par value, authorized 750 shares- 7 shares outstanding as of March 31, 2014 and December 31, 2013	42	42
Accumulated other comprehensive income	271	284
Retained earnings	2,496	2,590
Total common stockholders' equity	12,602	12,692
Long-term debt and other long-term obligations	16,804	15,831
Total capitalization	29,409	28,526
NONCURRENT LIABILITIES:
Deferred gain on sale and leaseback transaction	850	858
Accumulated deferred income taxes	7,028	6,968
Asset retirement obligations	1,704	1,678
Retirement benefits	2,713	2,689
Other	1,532	1,778
Total noncurrent liabilities	14,082	14,261
COMMITMENTS, GUARANTEES AND CONTINGENCIES (Note 10)
Total liabilities and capitalization	51,228	50,424
FES
CURRENT ASSETS:
Cash and cash equivalents	2	2
Receivables-
Customers, net of allowance for uncollectible accounts of $13 in 2014 and $11 in 2013	583	539
Affiliated companies	369	1,036
Other, net of allowance for uncollectible accounts of $3 in 2014 and 2013	151	81
Notes receivable from affiliated companies	215	0
Materials and supplies	427	448
Derivatives	244	165
Collateral	544	136
Prepayments and other	179	109
Total current assets	2,714	2,516
PROPERTY, PLANT AND EQUIPMENT:
In service	12,796	12,472
Less - Accumulated provision for depreciation	4,857	4,755
Property, plant and equipment in service net of accumulated provision for depreciation	7,939	7,717
Construction work in progress	1,356	1,308
Total net property, plant and equipment	9,295	9,025
INVESTMENTS:
Nuclear plant decommissioning trusts	1,323	1,276
Other	11	11
Total other property and investments	1,334	1,287
ASSETS HELD FOR SALE	0	122
DEFERRED CHARGES AND OTHER ASSETS:
Customer intangibles	91	95
Goodwill	23	23
Property taxes	30	41
Unamortized sale and leaseback costs	197	168
Derivatives	65	53
Other	150	172
Total deferred charges and other assets	556	552
Total assets	13,899	13,502
CURRENT LIABILITIES:
Currently payable long-term debt	465	892
Affiliated companies	555	4
Other	555	4
Accounts payable-
Affiliated companies	327	765
Other	295	290
Accrued taxes	97	66
Derivatives	159	110
Other	214	197
Total current liabilities	2,112	2,755
Common stockholders' equity-
Common stock, without par value, authorized 750 shares- 7 shares outstanding as of March 31, 2014 and December 31, 2013	3,580	3,080
Accumulated other comprehensive income	62	54
Retained earnings	2,191	2,178
Total common stockholders' equity	5,833	5,312
Long-term debt and other long-term obligations	2,551	2,130
Total capitalization	8,384	7,442
NONCURRENT LIABILITIES:
Deferred gain on sale and leaseback transaction	850	858
Accumulated deferred income taxes	810	741
Asset retirement obligations	1,029	1,015
Retirement benefits	189	185
Derivatives	36	14
Other	489	492
Total noncurrent liabilities	3,403	3,305
COMMITMENTS, GUARANTEES AND CONTINGENCIES (Note 10)
Total liabilities and capitalization	13,899	13,502
Affiliated Entity [Member] | FES
CURRENT LIABILITIES:
Affiliated companies	$ 0	$ 431