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Commitments and Contingencies - Schedule of Commitments and Obligations (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Commitments and Contingencies [Line Items]  
Energy procurement obligations of Pepco Energy Services $ 46
Guaranties associated with disposal of Conectiv Energy assets 13
Guaranteed lease residual values 19
Total 78
PHI [Member]
 
Commitments and Contingencies [Line Items]  
Energy procurement obligations of Pepco Energy Services 46
Guaranties associated with disposal of Conectiv Energy assets 13
Guaranteed lease residual values 3
Total 62
Potomac Electric Power Co [Member]
 
Commitments and Contingencies [Line Items]  
Energy procurement obligations of Pepco Energy Services   
Guaranties associated with disposal of Conectiv Energy assets   
Guaranteed lease residual values 5
Total 5
Delmarva Power & Light Co/De [Member]
 
Commitments and Contingencies [Line Items]  
Energy procurement obligations of Pepco Energy Services   
Guaranties associated with disposal of Conectiv Energy assets   
Guaranteed lease residual values 7
Total 7
Atlantic City Electric Co [Member]
 
Commitments and Contingencies [Line Items]  
Energy procurement obligations of Pepco Energy Services   
Guaranties associated with disposal of Conectiv Energy assets   
Guaranteed lease residual values 4
Total $ 4