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Segment Information - Reconciliation to Consolidated Financial Statements (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]                  
Total operating revenues $ 6,154     $ 5,980     $ 17,557 $ 16,360  
Income taxes 50     67     158 274  
Net income (loss): 707 $ 448 $ 658 700 $ 343 $ 669 1,813 1,711  
Total assets 106,070           106,070   $ 101,546
Pepco Holdings LLC                  
Segment Reporting Information [Line Items]                  
Total operating revenues 1,862     1,773     4,938 4,615  
Income taxes 72     49     158 103  
Net income (loss): 278 $ 158 $ 168 232 $ 103 $ 155 603 490  
Total assets 27,672           27,672   26,903
Related Party                  
Segment Reporting Information [Line Items]                  
Interest expense, net 6     6     18 18  
Related Party | Pepco Holdings LLC                  
Segment Reporting Information [Line Items]                  
Operating revenues from affiliates 3     2     7 7  
Operating Segment                  
Segment Reporting Information [Line Items]                  
Total operating revenues 6,154     5,980     17,557 16,360  
Depreciation and amortization 908     890     2,681 2,616  
Operating expenses 4,961     4,857     14,348 13,429  
Interest expense, net 496     437     1,446 1,277  
Income taxes 50     67     158 274  
Net income (loss): 707     700     1,813 1,711  
Capital expenditures 1,695     1,855     5,161 5,540  
Total assets 106,070           106,070   101,546
Operating Segment | Related Party                  
Segment Reporting Information [Line Items]                  
Operating revenues from affiliates 0     0     0 0  
Intersegment Eliminations                  
Segment Reporting Information [Line Items]                  
Total operating revenues (452)     (475)     (1,396) (1,370)  
Depreciation and amortization 0     0     0 0  
Operating expenses (465)     (478)     (1,425) (1,367)  
Interest expense, net 0     0     (2) (4)  
Income taxes 0     0     0 1  
Net income (loss): 0     (15)     0 (22)  
Capital expenditures 0     0     0 0  
Total assets (3,910)           (3,910)   (4,337)
Intersegment Eliminations | Pepco Holdings LLC                  
Segment Reporting Information [Line Items]                  
Total operating revenues (104)     (104)     (333) (314)  
Depreciation and amortization 0     0     0 0  
Operating expenses (104)     (103)     (333) (314)  
Interest expense, net (1)     (1)     (1) 2  
Income taxes 0     0     0 0  
Net income (loss): 0     0     0 0  
Capital expenditures 0     0     0 0  
Total assets (36)           (36)   (41)
Intersegment Eliminations | Related Party                  
Segment Reporting Information [Line Items]                  
Operating revenues from affiliates (450)     (458)     (1,389) (1,343)  
Intersegment Eliminations | Related Party | Pepco Holdings LLC                  
Segment Reporting Information [Line Items]                  
Operating revenues from affiliates (105)     (104)     (333) (313)  
Commonwealth Edison Co | Operating Segment                  
Segment Reporting Information [Line Items]                  
Total operating revenues 2,229     2,268     6,403 5,836  
Depreciation and amortization 387     357     1,124 1,045  
Operating expenses 1,731     1,738     5,192 4,472  
Interest expense, net 128     119     374 357  
Income taxes 36     94     85 235  
Net income (loss): 360     333     823 822  
Capital expenditures 508     664     1,619 1,926  
Total assets 44,718           44,718   42,827
Commonwealth Edison Co | Intersegment Eliminations | Related Party                  
Segment Reporting Information [Line Items]                  
Operating revenues from affiliates 2     9     6 14  
PECO Energy Co | Operating Segment                  
Segment Reporting Information [Line Items]                  
Total operating revenues 1,030     1,037     2,975 2,977  
Depreciation and amortization 108     100     318 297  
Operating expenses 868     847     2,471 2,436  
Interest expense, net 58     52     170 149  
Income taxes (4)     3     9 8  
Net income (loss): 117     146     356 410  
Capital expenditures 382     361     1,125 1,068  
Total assets 16,748           16,748   15,595
PECO Energy Co | Intersegment Eliminations | Related Party                  
Segment Reporting Information [Line Items]                  
Operating revenues from affiliates 4     2     7 6  
Baltimore Gas and Electric Company | Operating Segment                  
Segment Reporting Information [Line Items]                  
Total operating revenues 1,044     932     3,268 2,986  
Depreciation and amortization 162     161     474 487  
Operating expenses 949     835     2,751 2,503  
Interest expense, net 57     47     159 135  
Income taxes 4     11     32 76  
Net income (loss): 45     45     353 286  
Capital expenditures 365     330     1,033 986  
Total assets 15,038           15,038   14,184
Baltimore Gas and Electric Company | Intersegment Eliminations | Related Party                  
Segment Reporting Information [Line Items]                  
Operating revenues from affiliates 3     2     7 6  
Pepco Holdings LLC | Operating Segment                  
Segment Reporting Information [Line Items]                  
Total operating revenues 1,862     1,773     4,938 4,615  
Depreciation and amortization 235     257     716 741  
Operating expenses 1,439     1,440     3,977 3,864  
Interest expense, net 95     80     279 238  
Income taxes 72     49     158 103  
Net income (loss): 278     232     603 490  
Capital expenditures 440     488     1,343 1,510  
Total assets 27,672           27,672   26,903
Pepco Holdings LLC | Intersegment Eliminations | Related Party                  
Segment Reporting Information [Line Items]                  
Operating revenues from affiliates 3     2     7 7  
Potomac Electric Power Company | Operating Segment                  
Segment Reporting Information [Line Items]                  
Total operating revenues 861     822     2,320 2,174  
Depreciation and amortization 102     112     307 329  
Operating expenses 650     658     1,824 1,810  
Interest expense, net 50     41     142 122  
Income taxes 32     21     74 43  
Net income (loss): 140     120     323 249  
Capital expenditures 218     227     672 710  
Total assets 11,602           11,602   11,194
Potomac Electric Power Company | Intersegment Eliminations | Related Party                  
Segment Reporting Information [Line Items]                  
Operating revenues from affiliates 2     1     5 5  
Delmarva Power and Light Company | Operating Segment                  
Segment Reporting Information [Line Items]                  
Total operating revenues 462     450     1,343 1,273  
Depreciation and amortization 62     62     183 182  
Operating expenses 377     386     1,099 1,079  
Interest expense, net 22     18     69 53  
Income taxes 14     8     39 25  
Net income (loss): 55     43     156 128  
Capital expenditures 136     158     404 416  
Total assets 6,204           6,204   5,966
Delmarva Power and Light Company | Intersegment Eliminations | Related Party                  
Segment Reporting Information [Line Items]                  
Operating revenues from affiliates 2     2     5 5  
Atlantic City Electric Company | Operating Segment                  
Segment Reporting Information [Line Items]                  
Total operating revenues 540     502     1,280 1,172  
Depreciation and amortization 67     77     214 212  
Operating expenses 410     394     1,052 971  
Interest expense, net 21     19     59 52  
Income taxes 30     23     48 40  
Net income (loss): 83     71     133 122  
Capital expenditures 85     101     265 376  
Total assets 5,329           5,329   5,157
Atlantic City Electric Company | Intersegment Eliminations | Related Party                  
Segment Reporting Information [Line Items]                  
Operating revenues from affiliates 1     0     2 1  
Corporate and Other | Corporate, Non-Segment                  
Segment Reporting Information [Line Items]                  
Total operating revenues 441     445     1,369 1,316  
Depreciation and amortization 16     15     49 46  
Operating expenses 439     475     1,382 1,521  
Interest expense, net 158     139     466 402  
Income taxes (58)     (90)     (126) (149)  
Net income (loss): (93)     (41)     (322) (275)  
Capital expenditures 0     12     41 50  
Total assets 5,804           5,804   6,374
Corporate and Other | Corporate, Non-Segment | Pepco Holdings LLC                  
Segment Reporting Information [Line Items]                  
Total operating revenues 103     103     328 310  
Depreciation and amortization 4     6     12 18  
Operating expenses 106     105     335 318  
Interest expense, net 3     3     10 9  
Income taxes (4)     (3)     (3) (5)  
Net income (loss): 0     (2)     (9) (9)  
Capital expenditures 1     2     2 8  
Total assets 4,573           4,573   $ 4,627
Corporate and Other | Intersegment Eliminations | Related Party                  
Segment Reporting Information [Line Items]                  
Operating revenues from affiliates 438     443     1,362 1,310  
Corporate and Other | Intersegment Eliminations | Related Party | Pepco Holdings LLC                  
Segment Reporting Information [Line Items]                  
Operating revenues from affiliates 103     103     328 309  
Rate-regulated electric revenues                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 6,012     5,684     16,379 14,579  
Rate-regulated electric revenues | Pepco Holdings LLC                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 1,828     1,762     4,769 4,399  
Rate-regulated electric revenues | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 5,944     5,793     16,320 15,056  
Rate-regulated electric revenues | Intersegment Eliminations                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues (6)     (28)     (17) (45)  
Rate-regulated electric revenues | Intersegment Eliminations | Pepco Holdings LLC                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues (4)     (3)     (12) (11)  
Rate-regulated electric revenues | Commonwealth Edison Co | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 2,229     2,268     6,403 5,836  
Rate-regulated electric revenues | PECO Energy Co | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 960     970     2,537 2,484  
Rate-regulated electric revenues | Baltimore Gas and Electric Company | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 925     836     2,588 2,322  
Rate-regulated electric revenues | Pepco Holdings LLC | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 1,836     1,747     4,809 4,459  
Rate-regulated electric revenues | Potomac Electric Power Company | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 861     822     2,320 2,174  
Rate-regulated electric revenues | Delmarva Power and Light Company | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 439     426     1,221 1,123  
Rate-regulated electric revenues | Atlantic City Electric Company | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 540     502     1,280 1,172  
Rate-regulated electric revenues | Corporate and Other | Corporate, Non-Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 0     0     0 0  
Rate-regulated electric revenues | Corporate and Other | Corporate, Non-Segment | Pepco Holdings LLC                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 0     0     0 1  
Rate-regulated natural gas revenues                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 196     188     1,207 1,268  
Rate-regulated natural gas revenues | Pepco Holdings LLC                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 23     24     122 150  
Rate-regulated natural gas revenues | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 210     187     1,237 1,304  
Rate-regulated natural gas revenues | Intersegment Eliminations                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues (2)     0     (3) (3)  
Rate-regulated natural gas revenues | Intersegment Eliminations | Pepco Holdings LLC                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 0     0     0 0  
Rate-regulated natural gas revenues | Commonwealth Edison Co | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 0     0     0 0  
Rate-regulated natural gas revenues | PECO Energy Co | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 70     67     438 493  
Rate-regulated natural gas revenues | Baltimore Gas and Electric Company | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 119     96     680 664  
Rate-regulated natural gas revenues | Pepco Holdings LLC | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 23     24     122 150  
Rate-regulated natural gas revenues | Potomac Electric Power Company | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 0     0     0 0  
Rate-regulated natural gas revenues | Delmarva Power and Light Company | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 23     24     122 150  
Rate-regulated natural gas revenues | Atlantic City Electric Company | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 0     0     0 0  
Rate-regulated natural gas revenues | Corporate and Other | Corporate, Non-Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 0     0     0 0  
Rate-regulated natural gas revenues | Corporate and Other | Corporate, Non-Segment | Pepco Holdings LLC                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 0     0     0 0  
Shared service and other revenues | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 0     0     0 0  
Shared service and other revenues | Intersegment Eliminations                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues (444)     (447)     (1,376) (1,322)  
Shared service and other revenues | Intersegment Eliminations | Pepco Holdings LLC                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues (100)     (101)     (321) (303)  
Shared service and other revenues | Commonwealth Edison Co | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 0     0     0 0  
Shared service and other revenues | PECO Energy Co | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 0     0     0 0  
Shared service and other revenues | Baltimore Gas and Electric Company | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 0     0     0 0  
Shared service and other revenues | Pepco Holdings LLC | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 3     2     7 6  
Shared service and other revenues | Potomac Electric Power Company | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 0     0     0 0  
Shared service and other revenues | Delmarva Power and Light Company | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 0     0     0 0  
Shared service and other revenues | Atlantic City Electric Company | Operating Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 0     0     0 0  
Shared service and other revenues | Corporate and Other | Corporate, Non-Segment                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues 441     445     1,369 1,316  
Shared service and other revenues | Corporate and Other | Corporate, Non-Segment | Pepco Holdings LLC                  
Segment Reporting Information [Line Items]                  
Electric and natural gas operating revenues $ 103     $ 103     $ 328 $ 309