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Accounts Receivable - Allowance for Credit Losses Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     $ 170 $ 86
Commonwealth Edison Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     17 4
PECO Energy Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     79 31
Baltimore Gas and Electric Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     23 4
Pepco Holdings LLC        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     51 47
Potomac Electric Power Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     25 27
Delmarva Power and Light Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     7 9
Atlantic City Electric Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     19 11
Customer accounts receivable        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance $ 372 $ 323 317 327
Current period provision for expected credit losses 84 72 221 144
Writeoffs, net of recoveries 30 54 112 130
Ending balance 426 341 426 341
Customer accounts receivable | Commonwealth Edison Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 112 67 69 59
Current period provision for expected credit losses 16 24 77 45
Writeoffs, net of recoveries 7 15 25 28
Ending balance 121 76 121 76
Customer accounts receivable | PECO Energy Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 112 101 95 105
Current period provision for expected credit losses 28 13 63 32
Writeoffs, net of recoveries 5 19 23 42
Ending balance 135 95 135 95
Customer accounts receivable | Baltimore Gas and Electric Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 45 50 46 54
Current period provision for expected credit losses 20 9 34 23
Writeoffs, net of recoveries 5 7 20 25
Ending balance 60 52 60 52
Customer accounts receivable | Pepco Holdings LLC        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 103 105 107 109
Current period provision for expected credit losses 20 26 47 44
Writeoffs, net of recoveries 13 13 44 35
Ending balance 110 118 110 118
Customer accounts receivable | Potomac Electric Power Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 53 50 52 47
Current period provision for expected credit losses 12 11 30 24
Writeoffs, net of recoveries 7 5 24 15
Ending balance 58 56 58 56
Customer accounts receivable | Delmarva Power and Light Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 16 21 19 21
Current period provision for expected credit losses 4 6 8 10
Writeoffs, net of recoveries 3 4 10 8
Ending balance 17 23 17 23
Customer accounts receivable | Atlantic City Electric Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 34 34 36 41
Current period provision for expected credit losses 4 9 9 10
Writeoffs, net of recoveries 3 4 10 12
Ending balance 35 39 35 39
Other receivables        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 108 87 82 82
Current period provision for expected credit losses 7 6 43 21
Writeoffs, net of recoveries 4 5 14 15
Ending balance 111 88 111 88
Other receivables | Commonwealth Edison Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 29 18 17 17
Current period provision for expected credit losses 10 3 25 6
Writeoffs, net of recoveries 0 1 3 3
Ending balance 39 20 39 20
Other receivables | PECO Energy Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 20 8 8 9
Current period provision for expected credit losses 1 2 15 3
Writeoffs, net of recoveries 1 2 3 4
Ending balance 20 8 20 8
Other receivables | Baltimore Gas and Electric Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 5 8 7 10
Current period provision for expected credit losses 3 3 4 5
Writeoffs, net of recoveries 2 2 5 6
Ending balance 6 9 6 9
Other receivables | Pepco Holdings LLC        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 54 53 50 46
Current period provision for expected credit losses (7) (2) (1) 7
Writeoffs, net of recoveries 1 0 3 2
Ending balance 46 51 46 51
Other receivables | Potomac Electric Power Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 34 31 28 25
Current period provision for expected credit losses (8) (2) (2) 4
Writeoffs, net of recoveries 0 0 0 0
Ending balance 26 29 26 29
Other receivables | Delmarva Power and Light Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 7 9 8 7
Current period provision for expected credit losses 0 0 (1) 2
Writeoffs, net of recoveries 0 0 0 0
Ending balance 7 9 7 9
Other receivables | Atlantic City Electric Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 13 13 14 14
Current period provision for expected credit losses 1 0 2 1
Writeoffs, net of recoveries 1 0 3 2
Ending balance $ 13 $ 13 $ 13 $ 13