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Related Party Transactions - BSC and PHISCO Service Companies (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Exelon Business Services Co Affiliate |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction capitalized costs support services | $ 141 | $ 162 | $ 458 | $ 502
Exelon Business Services Co Affiliate | Commonwealth Edison Co |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Operating and maintenance from affiliates | 102 | 92 | 306 | 263
Related party transaction capitalized costs support services | 55 | 71 | 189 | 230
Exelon Business Services Co Affiliate | PECO Energy Co |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Operating and maintenance from affiliates | 61 | 55 | 180 | 160
Related party transaction capitalized costs support services | 23 | 29 | 81 | 89
Exelon Business Services Co Affiliate | Baltimore Gas and Electric Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Operating and maintenance from affiliates | 61 | 58 | 182 | 166
Related party transaction capitalized costs support services | 25 | 23 | 74 | 69
Exelon Business Services Co Affiliate | Pepco Holdings LLC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Operating and maintenance from affiliates | 46 | 50 | 145 | 135
Related party transaction capitalized costs support services | 38 | 39 | 114 | 114
Exelon Business Services Co Affiliate | Potomac Electric Power Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Operating and maintenance from affiliates | 29 | 30 | 92 | 85
Related party transaction capitalized costs support services | 16 | 13 | 51 | 41
Exelon Business Services Co Affiliate | Delmarva Power and Light Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Operating and maintenance from affiliates | 19 | 19 | 58 | 54
Related party transaction capitalized costs support services | 11 | 12 | 36 | 32
Exelon Business Services Co Affiliate | Atlantic City Electric Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Operating and maintenance from affiliates | 16 | 16 | 48 | 45
Related party transaction capitalized costs support services | 9 | 13 | 24 | 39
PHI Service Co Affiliate |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction capitalized costs support services | 27 | 25 | 85 | 74
PHI Service Co Affiliate | Pepco Holdings LLC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Operating and maintenance from affiliates | 0 | 0 | 0 | 0
Related party transaction capitalized costs support services | 27 | 24 | 85 | 73
PHI Service Co Affiliate | Potomac Electric Power Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Operating and maintenance from affiliates | 28 | 31 | 94 | 91
Related party transaction capitalized costs support services | 12 | 9 | 36 | 30
PHI Service Co Affiliate | Delmarva Power and Light Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Operating and maintenance from affiliates | 24 | 24 | 75 | 73
Related party transaction capitalized costs support services | 8 | 7 | 25 | 22
PHI Service Co Affiliate | Atlantic City Electric Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Operating and maintenance from affiliates | 23 | 23 | 71 | 67
Related party transaction capitalized costs support services | $ 7 | $ 7 | $ 24 | $ 20

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