Organization, Basis of Presentation and Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Receivables from customers
Customers, net of allowance for uncollectible accounts	$ 1,525,000		$ 1,392,000
FES
Receivables from customers
Customers, net of allowance for uncollectible accounts	424,000		366,000
OE
Receivables from customers
Customers, net of allowance for uncollectible accounts	163,000		177,000
CEI
Receivables from customers
Customers, net of allowance for uncollectible accounts	91,967		183,744
TE
Receivables from customers
Customers, net of allowance for uncollectible accounts	49,014	[1]	29	[1]
JCP&L
Receivables from customers
Customers, net of allowance for uncollectible accounts	235,000		323,000
Met-Ed
Receivables from customers
Customers, net of allowance for uncollectible accounts	138,587		178,522
Penelec
Receivables from customers
Customers, net of allowance for uncollectible accounts	125,979		148,864
Billed [Member]
Receivables from customers
Customers, net of allowance for uncollectible accounts	800,000		752,000
Billed [Member] | FES
Receivables from customers
Customers, net of allowance for uncollectible accounts	220,000		196,000
Billed [Member] | OE
Receivables from customers
Customers, net of allowance for uncollectible accounts	67,000		81,000
Billed [Member] | CEI
Receivables from customers
Customers, net of allowance for uncollectible accounts	40,000		95,000
Billed [Member] | TE
Receivables from customers
Customers, net of allowance for uncollectible accounts	24,000	[1]	0	[1]
Billed [Member] | JCP&L
Receivables from customers
Customers, net of allowance for uncollectible accounts	117,000		178,000
Billed [Member] | Met-Ed
Receivables from customers
Customers, net of allowance for uncollectible accounts	79,000		101,000
Billed [Member] | Penelec
Receivables from customers
Customers, net of allowance for uncollectible accounts	72,000		82,000
Unbilled [Member]
Receivables from customers
Customers, net of allowance for uncollectible accounts	725,000		640,000
Unbilled [Member] | FES
Receivables from customers
Customers, net of allowance for uncollectible accounts	204,000		170,000
Unbilled [Member] | OE
Receivables from customers
Customers, net of allowance for uncollectible accounts	96,000		96,000
Unbilled [Member] | CEI
Receivables from customers
Customers, net of allowance for uncollectible accounts	52,000		89,000
Unbilled [Member] | TE
Receivables from customers
Customers, net of allowance for uncollectible accounts	25,000	[1]	0	[1]
Unbilled [Member] | JCP&L
Receivables from customers
Customers, net of allowance for uncollectible accounts	118,000		145,000
Unbilled [Member] | Met-Ed
Receivables from customers
Customers, net of allowance for uncollectible accounts	60,000		78,000
Unbilled [Member] | Penelec
Receivables from customers
Customers, net of allowance for uncollectible accounts	$ 54,000		$ 67,000

[1] During 2011, TE's accounts receivable financing arrangement with Centerior Funding Corporation was terminated.