v3.26.1
Accounts Receivable - Allowance for Credit Losses Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     $ 171 $ 137
Commonwealth Edison Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     35 23
PECO Energy Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     48 50
Baltimore Gas and Electric Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     53 17
Pepco Holdings LLC        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     35 47
Potomac Electric Power Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     17 19
Delmarva Power and Light Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     7 11
Atlantic City Electric Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     11 17
Customer accounts receivable        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance $ 522 $ 486 435 406
Current period provision for expected credit losses 46 9 192 142
Writeoffs, net of recoveries 60 30 119 83
Ending balance 508 465 508 465
Customer accounts receivable | Commonwealth Edison Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 130 125 115 109
Current period provision for expected credit losses (6) (4) 26 29
Accounts Receivable, Allowance for Credit Loss, Recovery   (1)    
Writeoffs, net of recoveries 22   39 16
Ending balance 102 122 102 122
Customer accounts receivable | PECO Energy Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 160 160 137 133
Current period provision for expected credit losses (1) 5 37 46
Writeoffs, net of recoveries 17 11 32 25
Ending balance 142 154 142 154
Customer accounts receivable | Baltimore Gas and Electric Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 101 72 68 56
Current period provision for expected credit losses 45 3 88 26
Writeoffs, net of recoveries 10 9 20 16
Ending balance 136 66 136 66
Customer accounts receivable | Pepco Holdings LLC        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 131 129 115 108
Current period provision for expected credit losses 8 5 41 41
Writeoffs, net of recoveries 11 11 28 26
Ending balance 128 123 128 123
Customer accounts receivable | Potomac Electric Power Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 76 69 69 59
Current period provision for expected credit losses 8 7 25 24
Writeoffs, net of recoveries 7 7 17 14
Ending balance 77 69 77 69
Customer accounts receivable | Delmarva Power and Light Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 24 23 19 17
Current period provision for expected credit losses (1) 0 7 10
Writeoffs, net of recoveries 2 2 5 6
Ending balance 21 21 21 21
Customer accounts receivable | Atlantic City Electric Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 31 37 27 32
Current period provision for expected credit losses 1 (2) 9 7
Writeoffs, net of recoveries 2 2 6 6
Ending balance 30 33 30 33
Other receivables        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 102 113 94 107
Current period provision for expected credit losses 1 (7) 18 8
Accounts Receivable, Allowance for Credit Loss, Recovery   (1)    
Writeoffs, net of recoveries 9   18 8
Ending balance 94 107 94 107
Other receivables | Commonwealth Edison Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 27 34 23 34
Current period provision for expected credit losses 0 (3) 8 (1)
Writeoffs, net of recoveries 2 0 6 2
Ending balance 25 31 25 31
Other receivables | PECO Energy Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 22 22 18 18
Current period provision for expected credit losses (2) (2) 4 7
Writeoffs, net of recoveries 2 1 4 6
Ending balance 18 19 18 19
Other receivables | Baltimore Gas and Electric Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 4 6 4 6
Current period provision for expected credit losses 1 (3) 2 (2)
Accounts Receivable, Allowance for Credit Loss, Recovery   (2)   (1)
Writeoffs, net of recoveries 2   3  
Ending balance 3 5 3 5
Other receivables | Pepco Holdings LLC        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 49 51 49 49
Current period provision for expected credit losses 2 1 4 4
Writeoffs, net of recoveries 3 0 5 1
Ending balance 48 52 48 52
Other receivables | Potomac Electric Power Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 26 27 26 27
Current period provision for expected credit losses (1) 1 0 1
Writeoffs, net of recoveries 0 0 1 0
Ending balance 25 28 25 28
Other receivables | Delmarva Power and Light Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 11 9 10 9
Current period provision for expected credit losses 1 0 2 0
Writeoffs, net of recoveries 1 0 1 0
Ending balance 11 9 11 9
Other receivables | Atlantic City Electric Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 12 15 13 13
Current period provision for expected credit losses 2 0 2 3
Writeoffs, net of recoveries 2 0 3 1
Ending balance $ 12 $ 15 $ 12 $ 15