Fair Value Measurements (Details Textuals) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fair Value of Financial Instruments [Line Items]
Investment excludes Receivables, Payables and Accrued income	$ (7)	$ (52)
Cash balance excluded from available for sale securities	113	164
Investments not required to be disclosed	716	693
FES
Fair Value of Financial Instruments [Line Items]
Investment excludes Receivables, Payables and Accrued income	(6)	(58)
Cash balance excluded from available for sale securities	42	74
OE
Fair Value of Financial Instruments [Line Items]
Investment excludes Receivables, Payables and Accrued income	1	1
Cash balance excluded from available for sale securities	3	2
JCP&L
Fair Value of Financial Instruments [Line Items]
Investment excludes Receivables, Payables and Accrued income	2	2
Cash balance excluded from available for sale securities	$ 23	$ 19