Fair Value Measurements (Details Textuals) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value of Financial Instruments [Line Items]
Investment excludes Receivables, Payables and Accrued income	$ 43	$ (52)
Cash balance excluded from available for sale securities	596	164
Investments not required to be disclosed	709	693
FES
Fair Value of Financial Instruments [Line Items]
Investment excludes Receivables, Payables and Accrued income	47	(58)
Cash balance excluded from available for sale securities	443	74
Notes receivable, fair value	4
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	1	2
Cash balance excluded from available for sale securities	$ 51	$ 19