Non-Controlling Interest (Details) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	0	0
Atlantic City Electric Co [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding		62,145.00
Preferred Stock, Value		6
4.0% Series of 1944, $100 per share par value [Member] | Atlantic City Electric Co [Member]
Class of Stock [Line Items]
Redemption Price	105.50
Preferred Stock, Shares Outstanding		24,268.00
Preferred Stock, Value		2
4.35% Series of 1949, $100 per share par value [Member] | Atlantic City Electric Co [Member]
Class of Stock [Line Items]
Redemption Price	101.00
Preferred Stock, Shares Outstanding		2,942.00
4.35% Series of 1953, $100 per share par value [Member] | Atlantic City Electric Co [Member]
Class of Stock [Line Items]
Redemption Price	101.00
Preferred Stock, Shares Outstanding		1,680.00
4.10% Series of 1954, $100 per share par value [Member] | Atlantic City Electric Co [Member]
Class of Stock [Line Items]
Redemption Price	101.00
Preferred Stock, Shares Outstanding		20,504.00
Preferred Stock, Value		2
4.75% Series of 1958, $100 per share par value [Member] | Atlantic City Electric Co [Member]
Class of Stock [Line Items]
Redemption Price	101.00
Preferred Stock, Shares Outstanding		8,631.00
Preferred Stock, Value		1
5.0% Series of 1960, $100 per share par value [Member] | Atlantic City Electric Co [Member]
Class of Stock [Line Items]
Redemption Price	100.00
Preferred Stock, Shares Outstanding		4,120.00
Preferred Stock, Value		1