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Supplemental Financial Information - Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 2,957 $ 663 $ 1,858 $ 587
Restricted cash 473 438 485 358
Restricted cash included in other long-term assets 54 53 137 177
Cash, restricted cash, and cash equivalents - Held for Sale   12    
Total cash, restricted cash, and cash equivalents 3,484 1,166 2,480 1,122
Accrued Expenses [Abstract]        
Compensation-related accruals 894 1,069    
Taxes accrued 508 527    
Interest accrued 415 331    
Exelon Generation Co L L C [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 1,957 226 623 303
Restricted cash 62 89 100 146
Restricted cash included in other long-term assets 0 0 0 0
Cash, restricted cash, and cash equivalents - Held for Sale   12    
Total cash, restricted cash, and cash equivalents 2,019 327 723 449
Accrued Expenses [Abstract]        
Compensation-related accruals 318 426    
Taxes accrued 222 229    
Interest accrued 77 44    
Commonwealth Edison Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 241 83 76 90
Restricted cash 276 279 305 150
Restricted cash included in other long-term assets 44 43 127 163
Cash, restricted cash, and cash equivalents - Held for Sale   0    
Total cash, restricted cash, and cash equivalents 561 405 508 403
Accrued Expenses [Abstract]        
Compensation-related accruals 148 170    
Taxes accrued 80 94    
Interest accrued 65 109    
PECO Energy Co [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 344 19 242 21
Restricted cash 8 7 7 6
Restricted cash included in other long-term assets 0 0 0 0
Cash, restricted cash, and cash equivalents - Held for Sale   0    
Total cash, restricted cash, and cash equivalents 352 26 249 27
Accrued Expenses [Abstract]        
Compensation-related accruals 66 73    
Taxes accrued 61 16    
Interest accrued 36 37    
Baltimore Gas and Electric Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 225 144 326 24
Restricted cash 27 1 1 1
Restricted cash included in other long-term assets 0 0 0 0
Cash, restricted cash, and cash equivalents - Held for Sale   0    
Total cash, restricted cash, and cash equivalents 252 145 327 25
Accrued Expenses [Abstract]        
Compensation-related accruals 72 84    
Taxes accrued 90 73    
Interest accrued 39 46    
Pepco Holdings LLC [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 82 111 196 131
Restricted cash 71 39 38 36
Restricted cash included in other long-term assets 9 10 10 14
Cash, restricted cash, and cash equivalents - Held for Sale   0    
Total cash, restricted cash, and cash equivalents 162 160 244 181
Accrued Expenses [Abstract]        
Compensation-related accruals 108 109    
Taxes accrued 98 117    
Interest accrued 75 51    
Potomac Electric Power Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 19 30 125 30
Restricted cash 41 35 33 33
Restricted cash included in other long-term assets 0 0 0 0
Cash, restricted cash, and cash equivalents - Held for Sale   0    
Total cash, restricted cash, and cash equivalents 60 65 158 63
Accrued Expenses [Abstract]        
Compensation-related accruals 34 36    
Taxes accrued 67 90    
Interest accrued 37 26    
Delmarva Power and Light Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 13 15 26 13
Restricted cash 26 0 0 0
Restricted cash included in other long-term assets 0 0 0 0
Cash, restricted cash, and cash equivalents - Held for Sale   0    
Total cash, restricted cash, and cash equivalents 39 15 26 13
Accrued Expenses [Abstract]        
Compensation-related accruals 21 18    
Taxes accrued 16 18    
Interest accrued 20 7    
Atlantic City Electric Company [Member]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 16 17 13 12
Restricted cash 5 3 4 2
Restricted cash included in other long-term assets 9 10 10 14
Cash, restricted cash, and cash equivalents - Held for Sale   0    
Total cash, restricted cash, and cash equivalents 30 30 $ 27 $ 28
Accrued Expenses [Abstract]        
Compensation-related accruals 16 17    
Taxes accrued 7 12    
Interest accrued $ 15 $ 12