v3.26.3
Accounts Receivable - Allowance for Credit Losses Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     $ 243 $ 202
Commonwealth Edison Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     62 41
PECO Energy Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     70 75
Baltimore Gas and Electric Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     51 20
Pepco Holdings LLC        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     60 66
Potomac Electric Power Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     28 29
Delmarva Power and Light Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     12 13
Atlantic City Electric Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Current period provision for expected credit losses     20 24
Customer accounts receivable        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance $ 508 $ 465 435 406
Current period provision for expected credit losses 71 82 265 224
Writeoffs, net of recoveries 72 96 193 179
Ending balance 507 451 507 451
Customer accounts receivable | Commonwealth Edison Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 102 122 115 109
Current period provision for expected credit losses 22 37 49 66
Writeoffs, net of recoveries 19 44 59 60
Ending balance 105 115 105 115
Customer accounts receivable | PECO Energy Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 142 154 137 133
Current period provision for expected credit losses 21 22 59 68
Writeoffs, net of recoveries 28 31 61 56
Ending balance 135 145 135 145
Customer accounts receivable | Baltimore Gas and Electric Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 136 66 68 56
Current period provision for expected credit losses 2 8 90 34
Writeoffs, net of recoveries 7 6 27 22
Ending balance 131 68 131 68
Customer accounts receivable | Pepco Holdings LLC        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 128 123 115 108
Current period provision for expected credit losses 26 15 67 56
Writeoffs, net of recoveries 18 15 46 41
Ending balance 136 123 136 123
Customer accounts receivable | Potomac Electric Power Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 77 69 69 59
Current period provision for expected credit losses 16 11 41 35
Writeoffs, net of recoveries 9 8 26 22
Ending balance 84 72 84 72
Customer accounts receivable | Delmarva Power and Light Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 21 21 19 17
Current period provision for expected credit losses 4 3 11 13
Writeoffs, net of recoveries 4 4 9 10
Ending balance 21 20 21 20
Customer accounts receivable | Atlantic City Electric Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 30 33 27 32
Current period provision for expected credit losses 6 1 15 8
Writeoffs, net of recoveries 5 3 11 9
Ending balance 31 31 31 31
Other receivables        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 94 107 94 107
Current period provision for expected credit losses 15 7 32 15
Writeoffs, net of recoveries 13 16 30 24
Ending balance 96 98 96 98
Other receivables | Commonwealth Edison Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 25 31 23 34
Current period provision for expected credit losses 6 5 14 4
Writeoffs, net of recoveries 5 11 11 13
Ending balance 26 25 26 25
Other receivables | PECO Energy Co        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 18 19 18 18
Current period provision for expected credit losses 3 2 6 9
Writeoffs, net of recoveries 5 4 8 10
Ending balance 16 17 16 17
Other receivables | Baltimore Gas and Electric Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 3 5 4 6
Current period provision for expected credit losses 1 1 3 (1)
Writeoffs, net of recoveries 1 1 4 0
Ending balance 3 5 3 5
Other receivables | Pepco Holdings LLC        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 48 52 49 49
Current period provision for expected credit losses 5 (1) 9 3
Writeoffs, net of recoveries 2 0 7 1
Ending balance 51 51 51 51
Other receivables | Potomac Electric Power Company        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 25 28 26 27
Current period provision for expected credit losses 1 0 1 1
Writeoffs, net of recoveries 0 0 1 0
Ending balance 26 28 26 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 3 0
Writeoffs, net of recoveries 1 0 2 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 3 (1) 5 2
Writeoffs, net of recoveries 1 0 4 1
Ending balance $ 14 $ 14 $ 14 $ 14