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Significant Accounting Policies - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Mar. 23, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Net Cash Provided by (Used in) Operating Activities   $ (1,201,000,000) $ (1,473,000,000)  
Net Cash Provided by (Used in) Financing Activities   (1,184,000,000) (1,533,000,000)  
Pepco Holdings LLC [Member] | Predecessor [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results   1,000,000    
Net Cash Provided by (Used in) Operating Activities       $ (264,000,000)
Net Cash Provided by (Used in) Financing Activities       $ (372,000,000)
Pepco Holdings LLC [Member] | Successor [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Quantifying Misstatement in Current Year Financial Statements, Amount $ 46,000,000      
Net Cash Provided by (Used in) Operating Activities 3,000,000 (194,000,000)    
Net Cash Provided by (Used in) Financing Activities $ 135,000,000 (66,000,000)    
Delmarva Power and Light Company [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results   1,000,000    
Net Cash Provided by (Used in) Operating Activities   (122,000,000) (147,000,000)  
Net Cash Provided by (Used in) Financing Activities   44,000,000 68,000,000  
Atlantic City Electric Company [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results   1,000,000    
Net Cash Provided by (Used in) Operating Activities   (58,000,000) (246,000,000)  
Net Cash Provided by (Used in) Financing Activities   20,000,000 27,000,000  
Potomac Electric Power Company [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results   1,000,000    
Net Cash Provided by (Used in) Operating Activities   (29,000,000) (258,000,000)  
Net Cash Provided by (Used in) Financing Activities   $ (114,000,000) $ 103,000,000