Subsequent Events (Exelon, PECO and BGE)	9 Months Ended
Sep. 30, 2012
Subsequent Events Disclosure [Line Items]
Schedule Of Subsequent Events Text Block	19. Subsequent Events (Exelon, PECO and BGE) On October 29, 2012, a category 1 hurricane, Hurricane Sandy, interrupted electric service delivery to more than 850,000 customers and 325,000 customers in PECO's and BGE's service territories, respectively. Restoration efforts will include significant costs associated with employee overtime, support from other utilities and incremental equipment, contracted tree trimming crews and supplies. PECO and BGE estimate that restoration efforts will result in approximately $49 million to $55 million and $33 million to $37 million of incremental operating and maintenance expense, respectively, and $32 million to $36 million and $13 million to $14 million of incremental capital expenditures, respectively, for the fourth quarter.

- Definition

Tabular disclosure of significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, losses resulting from fire or flood, losses on receivables, significant realized and unrealized gains and losses that result from changes in quoted market prices of securities, declines in market prices of inventory, changes in authorized or issued debt (SEC), significant foreign exchange rate changes, substantial loans to insiders or affiliates, significant long-term investments, and substantial dividends not in the ordinary course of business.

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