Taxes (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accumulated deferred income taxes
Property basis differences	$ 8,078	$ 7,868
Regulatory transition charge	(26)	79
Customer receivables for future income taxes	(2)	130
Deferred MISO/PJM transmission costs	27	125
Other regulatory assets — RCP	69	161
Deferred sale and leaseback gain	(411)	(431)
Non-utility generation costs	(1)	5
Unamortized investment tax credits	(62)	(67)
Unrealized losses on derivative hedges	(20)	(21)
Pensions and OPEB	(938)	(1,102)
Lease market valuation liability	(59)	(81)
Oyster Creek securitization (Note 12)	57	75
Nuclear decommissioning activities	44	127
Mark-to-market adjustments	31	30
Deferred gain for asset sales — affiliated companies	781
Loss carryforwards and AMT credits	(1,599)	(1,199)
Loss carryforward valuation reserve	142	102
Storm damage	179	192
Market transition charge	81	65
All other	231	239
Net deferred income tax liability	6,602	6,297
FES
Accumulated deferred income taxes
Property basis differences	1,428	1,060
Regulatory transition charge	0	0
Customer receivables for future income taxes	0	0
Deferred MISO/PJM transmission costs	0	0
Other regulatory assets — RCP	0	0
Deferred sale and leaseback gain	(370)	(384)
Non-utility generation costs	0	0
Unamortized investment tax credits	(16)	(17)
Unrealized losses on derivative hedges	(1)	2
Pensions and OPEB	(77)	(105)
Lease market valuation liability	55	33
Oyster Creek securitization (Note 12)	0	0
Nuclear decommissioning activities	31	111
Mark-to-market adjustments	30	30
Deferred gain for asset sales — affiliated companies	0
Loss carryforwards and AMT credits	(369)	(221)
Loss carryforward valuation reserve	18	16
Storm damage	0	0
Market transition charge	0	0
All other	(13)	(22)
Net deferred income tax liability	$ 716	$ 503