Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Condensed Balance Sheet - Phantom (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Common stock, par value	$ 0us-gaap_CommonStockNoParValue	$ 0us-gaap_CommonStockNoParValue
Common stock, shares authorized	2,000,000,000us-gaap_CommonStockSharesAuthorized	2,000,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares outstanding	859,833,343us-gaap_CommonStockSharesOutstanding	857,290,484us-gaap_CommonStockSharesOutstanding
Treasury Stock, Shares held	35,000,000us-gaap_TreasuryStockShares	35,000,000us-gaap_TreasuryStockShares
Exelon Corporate [Member]
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	2,000,000,000	2,000,000,000
Common stock, shares outstanding	860,000,000	857,000,000
Treasury Stock, Shares held	35,000,000	35,000,000

Face amount per share of no-par value common stock.

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