Organization, Basis of Presentation and Significant Accounting Policies (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of Significant Accounting Policies (Textuals) [Abstract]
Regulatory assets that do not earn a current return	$ 779
Net regulatory liabilities	392	381
Net plant in service	30,610	28,283
Construction work in progress	2,293	2,054
Goodwill	6,447	6,441	5,575
Other-than-temporary impairments	16	19	33
Bath County, Virginia
Summary of Significant Accounting Policies (Textuals) [Abstract]
Plant generation capacity	2,773
Net plant in service	447
JCP&L
Summary of Significant Accounting Policies (Textuals) [Abstract]
Regulatory assets that do not earn a current return	386
Deferral of above-market costs for power included in regulatory transition costs	120
Net plant in service	3,659	3,129
Construction work in progress	103	227
Goodwill	1,811	1,811
PJM
Summary of Significant Accounting Policies (Textuals) [Abstract]
Regulatory assets that do not earn a current return	393
AGC | Bath County, Virginia
Summary of Significant Accounting Policies (Textuals) [Abstract]
Pumped storage hydroelectric station, Ownership percentage	40.00%
Plant generation capacity	1,109
Construction work in progress	19
Virginia Electric and Power Company | Bath County, Virginia
Summary of Significant Accounting Policies (Textuals) [Abstract]
Pumped storage hydroelectric station, Ownership percentage	60.00%
FES
Summary of Significant Accounting Policies (Textuals) [Abstract]
Net plant in service	7,589	6,873
Construction work in progress	1,141	1,014
Goodwill	$ 24	$ 24