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Credit Facilities and Short-Term Borrowings (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Credit facilities        
Bank lines of credit under committed credit facilities $ 130,000,000      
Short-term notes outstanding   32,400,000    
Net available liquidity        
Cash and cash equivalents 964,500,000 2,028,500,000 3,440,000,000 202,200,000
Syndicated Revolver October 2013 upon closing of merger with Exelon
       
Credit facilities        
Net available facilities 1,500,000,000      
Net available liquidity        
Net available facilities 1,500,000,000      
Constellation Energy;
       
Credit facilities        
Bank lines of credit under committed credit facilities 4,200,000,000      
Net available facilities 2,700,000,000      
Letters of credit issued including the commodities linked credit facility 1,500,000,000      
Short-term notes outstanding 39,500,000      
Short-term notes outstanding weighted average interest rate (as a percent) 2.59%      
Net available liquidity        
Credit facilities 3,700,000,000      
Less: Letters of credit issued (1,000,000,000)      
Undrawn facilities 2,700,000,000      
Net available facilities 2,700,000,000      
Add: Cash and cash equivalents 900,000,000      
Net available liquidity 3,600,000,000      
Credit Facility Compliance and Covenants        
Credit facilities, required debt-capitalization ratio percentage (as a percent) 65.00%      
Credit facilities, calculated debt-capitalization ratio percentage (as a percent) 38.00%      
Constellation Energy; | Syndicated Revolver October 2013 upon closing of merger with Exelon
       
Credit facilities        
Bank lines of credit under committed credit facilities 2,500,000,000      
Constellation Energy; | Commodity-linked August 2014
       
Credit facilities        
Bank lines of credit under committed credit facilities 500,000,000      
Letters of credit issued including the commodities linked credit facility 500,000,000      
Net available liquidity        
Credit facilities 500,000,000      
Constellation Energy; | Bilateral September 2014
       
Credit facilities        
Bank lines of credit under committed credit facilities 550,000,000      
Constellation Energy; | Bilateral December 2014
       
Credit facilities        
Bank lines of credit under committed credit facilities 250,000,000      
Constellation Energy; | Bilateral June 2014
       
Credit facilities        
Bank lines of credit under committed credit facilities 250,000,000      
Constellation Energy; | Bilateral September 2013
       
Credit facilities        
Bank lines of credit under committed credit facilities 150,000,000      
Baltimore Gas and Electric Company
       
Credit facilities        
Net available facilities 600,000,000      
Net available liquidity        
Credit facilities 600,000,000      
Undrawn facilities 600,000,000      
Net available facilities 600,000,000      
Net available liquidity 600,000,000      
Cash and cash equivalents 48,600,000 50,000,000 13,600,000 10,700,000
Credit Facility Compliance and Covenants        
Credit facilities, required debt-capitalization ratio percentage (as a percent) 65.00%      
Credit facilities, calculated debt-capitalization ratio percentage (as a percent) 46.00%      
Subsidiary of Constellation Energy
       
Credit facilities        
Amount borrowed under line of credit facility $ 130,000,000