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Supplemental Financial Information - Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 735 $ 1,349 $ 694 $ 898
Restricted cash 252 247 206 207
Restricted cash included in other long-term assets 191 185 128 85
Total cash, cash equivalents and restricted cash 1,178 1,781 1,028 1,190
Receivables [Abstract]        
Unbilled customer revenues 1,352 1,656    
Accrued Expenses [Abstract]        
Compensation-related accruals 767 1,191    
Taxes accrued 446 412    
Interest accrued 340 334    
Exelon Generation Co L L C [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 575 750 420 416
Restricted cash 122 153 130 138
Restricted cash included in other long-term assets 0 0 0 0
Total cash, cash equivalents and restricted cash 697 903 550 554
Receivables [Abstract]        
Unbilled customer revenues 703 965    
Accrued Expenses [Abstract]        
Compensation-related accruals 292 479    
Taxes accrued 304 226    
Interest accrued 76 77    
Commonwealth Edison Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 65 135 30 76
Restricted cash 77 29 5 5
Restricted cash included in other long-term assets 174 166 108 63
Total cash, cash equivalents and restricted cash 316 330 143 144
Receivables [Abstract]        
Unbilled customer revenues 218 223    
Accrued Expenses [Abstract]        
Compensation-related accruals 117 187    
Taxes accrued 65 71    
Interest accrued 109 105    
PECO Energy Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 20 130 18 271
Restricted cash 6 5 5 4
Restricted cash included in other long-term assets 0 0 0 0
Total cash, cash equivalents and restricted cash 26 135 23 275
Receivables [Abstract]        
Unbilled customer revenues 121 114    
Accrued Expenses [Abstract]        
Compensation-related accruals 52 49    
Taxes accrued 14 28    
Interest accrued 33 33    
Baltimore Gas and Electric Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 8 7 7 17
Restricted cash 1 6 1 1
Restricted cash included in other long-term assets 0 0 0 0
Total cash, cash equivalents and restricted cash 9 13 8 18
Receivables [Abstract]        
Unbilled customer revenues 115 168    
Accrued Expenses [Abstract]        
Compensation-related accruals 41 68    
Taxes accrued 21 46    
Interest accrued 40 39    
Pepco Holdings LLC [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 54 124 195 30
Restricted cash 37 43 38 42
Restricted cash included in other long-term assets 17 19 20 23
Total cash, cash equivalents and restricted cash 108 186 253 95
Receivables [Abstract]        
Unbilled customer revenues 195 186    
Accrued Expenses [Abstract]        
Compensation-related accruals 72 99    
Taxes accrued 75 74    
Interest accrued 50 50    
Potomac Electric Power Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 18 16 47 5
Restricted cash 34 37 33 35
Restricted cash included in other long-term assets 0 0 0 0
Total cash, cash equivalents and restricted cash 52 53 80 40
Receivables [Abstract]        
Unbilled customer revenues 107 97    
Accrued Expenses [Abstract]        
Compensation-related accruals 23 29    
Taxes accrued 54 58    
Interest accrued 24 25    
Delmarva Power and Light Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 3 23 141 2
Restricted cash 1 1 0 0
Restricted cash included in other long-term assets 0 0 0 0
Total cash, cash equivalents and restricted cash 4 24 141 2
Receivables [Abstract]        
Unbilled customer revenues 47 59    
Accrued Expenses [Abstract]        
Compensation-related accruals 15 19    
Taxes accrued 13 4    
Interest accrued 8 8    
Atlantic City Electric Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 4 7 6 2
Restricted cash 2 4 5 6
Restricted cash included in other long-term assets 17 19 20 23
Total cash, cash equivalents and restricted cash 23 30 $ 31 $ 31
Receivables [Abstract]        
Unbilled customer revenues 41 30    
Accrued Expenses [Abstract]        
Compensation-related accruals 10 12    
Taxes accrued 9 5    
Interest accrued $ 13 $ 12