Consolidated Balance Sheets (Ohio Edison Company) (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Common stockholders' equity-
Common stock, shares authorized	490,000,000	490,000,000
Common stock, shares outstanding	418,216,437	418,216,437
OE
Common stockholders' equity-
Common stock, no par value
Common stock, shares authorized	175,000,000	175,000,000
Common stock, shares outstanding	60	60
Customer [Member]
Receivables-
Allowance for uncollectible accounts	40	37
Customer [Member] | OE
Receivables-
Allowance for uncollectible accounts	4	4