Consolidated Balance Sheets (FirstEnergy Corp.) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
CURRENT ASSETS:
Cash and cash equivalents	$ 71	$ 172
Receivables-
Customers, net of allowance for uncollectible accounts	1,646	1,614
Other, net of allowance for uncollectible accounts	277	315
Materials and supplies, at average cost	806	861
Prepaid taxes	288	119
Derivatives	173	160
Accumulated deferred income taxes	51	319
Other	248	208
Total current assets	3,560	3,768
PROPERTY, PLANT AND EQUIPMENT:
In service	43,888	43,210
Less - Accumulated provision for depreciation	13,027	12,600
Property, plant and equipment in service net of accumulated provision for depreciation	30,861	30,610
Construction work in progress	2,230	2,293
Total net property, plant and equipment	33,091	32,903
INVESTMENTS:
Nuclear plant decommissioning trusts	2,178	2,204
Investments in lease obligation bonds	46	54
Other	876	936
Total other property and investments	3,100	3,194
DEFERRED CHARGES AND OTHER ASSETS:
Goodwill	6,447	6,447
Regulatory assets	2,321	2,375
Other	1,638	1,719
Total deferred charges and other assets	10,406	10,541
Total assets	50,157	50,406
CURRENT LIABILITIES:
Currently payable long-term debt	1,952	1,999
Short-term borrowings	3,254	1,969
Accounts payable	950	1,599
Accrued taxes	338	543
Accrued compensation and benefits	298	331
Derivatives	142	126
Other	599	1,038
Total current liabilities	7,533	7,605
Common stockholders' equity-
Common stock	42	42
Other paid-in capital	9,744	9,769
Accumulated other comprehensive income	323	385
Retained earnings	2,690	2,888
Total common stockholders' equity	12,799	13,084
Noncontrolling interest	4	9
Total equity	12,803	13,093
Long-term debt and other long-term obligations	15,449	15,179
Total capitalization	28,252	28,272
NONCURRENT LIABILITIES:
Accumulated deferred income taxes	6,427	6,616
Retirement benefits	3,088	3,080
Asset retirement obligations	1,795	1,599
Deferred gain on sale and leaseback transaction	875	892
Adverse power contract liability	484	506
Other	1,703	1,836
Total noncurrent liabilities	14,372	14,529
COMMITMENTS, GUARANTEES AND CONTINGENCIES (Note 12)
Total liabilities and capitalization	$ 50,157	$ 50,406