Organization, Basis of Presentation and Significant Accounting Policies (Details 4)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
FG
Annual Composite Depreciation Rate
Annual Composite Depreciation Rate	3.00%	3.10%	4.00%
NG
Annual Composite Depreciation Rate
Annual Composite Depreciation Rate	2.50%	3.20%	3.10%
OE
Annual Composite Depreciation Rate
Annual Composite Depreciation Rate	2.90%	2.90%	2.90%
JCP&L
Annual Composite Depreciation Rate
Annual Composite Depreciation Rate	2.10%	2.10%	2.20%