Transactions With Affiliated Companies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
FES
Investment Income:
Interest income from FE	$ 2	$ 2	$ 3
Interest Expense:
Interest expense to affiliates	10	8	10
Interest expense to FE	1	1	0
FES | Electric sales to affiliates
REVENUES:
Related Party Transaction, Revenues from Transactions with Related Party	515	752	2,227
FES | Ground lease with ATSI
REVENUES:
Related Party Transaction, Revenues from Transactions with Related Party	0	0	0
FES | Other
REVENUES:
Related Party Transaction, Revenues from Transactions with Related Party	16	80	88
FES | Purchased power from affiliates
EXPENSES:
Related Party Transaction, Expenses from Transactions with Related Party	451	242	371
FES | Fuel
EXPENSES:
Related Party Transaction, Expenses from Transactions with Related Party	2	37	46
FES | Support services
EXPENSES:
Related Party Transaction, Expenses from Transactions with Related Party	570	655	620
OE
Investment Income:
Interest income from FE	1	0	0
Interest Expense:
Interest expense to affiliates	6	4	3
Interest expense to FE	0	0	0
OE | Electric sales to affiliates
REVENUES:
Related Party Transaction, Revenues from Transactions with Related Party	209	200	190
OE | Ground lease with ATSI
REVENUES:
Related Party Transaction, Revenues from Transactions with Related Party	12	12	12
OE | Other
REVENUES:
Related Party Transaction, Revenues from Transactions with Related Party	1	1	1
OE | Purchased power from affiliates
EXPENSES:
Related Party Transaction, Expenses from Transactions with Related Party	159	287	522
OE | Fuel
EXPENSES:
Related Party Transaction, Expenses from Transactions with Related Party	0	0	0
OE | Support services
EXPENSES:
Related Party Transaction, Expenses from Transactions with Related Party	118	130	128
JCP&L
Investment Income:
Interest income from FE	0	0	0
Interest Expense:
Interest expense to affiliates	4	4	4
Interest expense to FE	2	1	0
JCP&L | Electric sales to affiliates
REVENUES:
Related Party Transaction, Revenues from Transactions with Related Party	0	0	0
JCP&L | Ground lease with ATSI
REVENUES:
Related Party Transaction, Revenues from Transactions with Related Party	0	0	0
JCP&L | Other
REVENUES:
Related Party Transaction, Revenues from Transactions with Related Party	0	0	0
JCP&L | Purchased power from affiliates
EXPENSES:
Related Party Transaction, Expenses from Transactions with Related Party	0	0	0
JCP&L | Fuel
EXPENSES:
Related Party Transaction, Expenses from Transactions with Related Party	0	0	0
JCP&L | Support services
EXPENSES:
Related Party Transaction, Expenses from Transactions with Related Party	$ 96	$ 90	$ 94