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Supplemental Financial Information - Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 1,683 $ 1,349 $ 1,918 $ 898
Restricted cash 309 247 240 207
Restricted cash included in other long-term assets 186 185 163 85
Total cash, cash equivalents and restricted cash 2,178 1,781 2,321 1,190
Receivables [Abstract]        
Unbilled customer revenues 1,256 1,656    
Accrued Expenses [Abstract]        
Compensation-related accruals 880 1,191    
Taxes accrued 431 412    
Interest accrued 421 334    
Exelon Generation Co L L C [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 1,019 750 1,187 416
Restricted cash 126 153 152 138
Restricted cash included in other long-term assets 0 0 0 0
Total cash, cash equivalents and restricted cash 1,145 903 1,339 554
Receivables [Abstract]        
Unbilled customer revenues 676 965    
Accrued Expenses [Abstract]        
Compensation-related accruals 336 479    
Taxes accrued 247 226    
Interest accrued 106 77    
Commonwealth Edison Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 76 135 124 76
Restricted cash 124 29 12 5
Restricted cash included in other long-term assets 171 166 144 63
Total cash, cash equivalents and restricted cash 371 330 280 144
Receivables [Abstract]        
Unbilled customer revenues 212 223    
Accrued Expenses [Abstract]        
Compensation-related accruals 133 187    
Taxes accrued 56 71    
Interest accrued 62 105    
PECO Energy Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 224 130 102 271
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 230 135 107 275
Receivables [Abstract]        
Unbilled customer revenues 102 114    
Accrued Expenses [Abstract]        
Compensation-related accruals 48 49    
Taxes accrued 13 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 130 7 113 17
Restricted cash 1 6 3 1
Restricted cash included in other long-term assets 0 0 0 0
Total cash, cash equivalents and restricted cash 131 13 116 18
Receivables [Abstract]        
Unbilled customer revenues 103 168    
Accrued Expenses [Abstract]        
Compensation-related accruals 63 68    
Taxes accrued 64 46    
Interest accrued 36 39    
Pepco Holdings LLC [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 99 124 153 30
Restricted cash 38 43 42 42
Restricted cash included in other long-term assets 15 19 19 23
Total cash, cash equivalents and restricted cash 152 186 214 95
Receivables [Abstract]        
Unbilled customer revenues 163 186    
Accrued Expenses [Abstract]        
Compensation-related accruals 86 99    
Taxes accrued 80 74    
Interest accrued 78 50    
Potomac Electric Power Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 18 16 12 5
Restricted cash 34 37 35 35
Restricted cash included in other long-term assets 0 0 0 0
Total cash, cash equivalents and restricted cash 52 53 47 40
Receivables [Abstract]        
Unbilled customer revenues 91 97    
Accrued Expenses [Abstract]        
Compensation-related accruals 26 29    
Taxes accrued 61 58    
Interest accrued 37 25    
Delmarva Power and Light Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 11 23 110 2
Restricted cash 0 1 0 0
Restricted cash included in other long-term assets 0 0 0 0
Total cash, cash equivalents and restricted cash 11 24 110 2
Receivables [Abstract]        
Unbilled customer revenues 38 59    
Accrued Expenses [Abstract]        
Compensation-related accruals 17 19    
Taxes accrued 17 4    
Interest accrued 20 8    
Atlantic City Electric Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 13 7 11 2
Restricted cash 3 4 7 6
Restricted cash included in other long-term assets 15 19 19 23
Total cash, cash equivalents and restricted cash 31 30 $ 37 $ 31
Receivables [Abstract]        
Unbilled customer revenues 34 30    
Accrued Expenses [Abstract]        
Compensation-related accruals 13 12    
Taxes accrued 3 5    
Interest accrued $ 19 $ 12