Organization, Basis of Presentation and Significant Accounting Policies (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Receivables from customers
Customers, net of allowance for uncollectible accounts	$ 1,614	$ 1,525
FES
Receivables from customers
Customers, net of allowance for uncollectible accounts	483	424
OE
Receivables from customers
Customers, net of allowance for uncollectible accounts	176	163
JCP&L
Receivables from customers
Customers, net of allowance for uncollectible accounts	221	235
Billed
Receivables from customers
Customers, net of allowance for uncollectible accounts	893	800
Billed | FES
Receivables from customers
Customers, net of allowance for uncollectible accounts	243	220
Billed | OE
Receivables from customers
Customers, net of allowance for uncollectible accounts	96	67
Billed | JCP&L
Receivables from customers
Customers, net of allowance for uncollectible accounts	124	117
Unbilled
Receivables from customers
Customers, net of allowance for uncollectible accounts	721	725
Unbilled | FES
Receivables from customers
Customers, net of allowance for uncollectible accounts	240	204
Unbilled | OE
Receivables from customers
Customers, net of allowance for uncollectible accounts	80	96
Unbilled | JCP&L
Receivables from customers
Customers, net of allowance for uncollectible accounts	$ 97	$ 118