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Related Party Transactions - Current Receivables From/Payables To Affiliates (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Related Party |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | $ 296 | $ 251
Accounts payable | 5 | 5
Commonwealth Edison Co | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Accounts payable | 116 | 72
Commonwealth Edison Co | PECO Energy Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Commonwealth Edison Co | Baltimore Gas And Electric Company Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 1 | 0
Commonwealth Edison Co | Pepco Holdings LLC Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Commonwealth Edison Co | Potomac Electric Power Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Commonwealth Edison Co | Delmarva Power and Light Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Commonwealth Edison Co | Atlantic City Electric Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Commonwealth Edison Co | Other Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 3 | 3
Commonwealth Edison Co | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts payable | 116 | 72
Receivables from affiliates | 4 | 3
PECO Energy Co | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Accounts payable | 36 | 39
PECO Energy Co | Commonwealth Edison Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 1 | 0
PECO Energy Co | Baltimore Gas And Electric Company Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
PECO Energy Co | Pepco Holdings LLC Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
PECO Energy Co | Potomac Electric Power Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
PECO Energy Co | Delmarva Power and Light Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 1
PECO Energy Co | Atlantic City Electric Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 1
PECO Energy Co | Other Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
PECO Energy Co | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts payable | 36 | 39
Receivables from affiliates | 1 | 2
Baltimore Gas and Electric Company | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Accounts payable | 48 | 35
Baltimore Gas and Electric Company | Commonwealth Edison Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Baltimore Gas and Electric Company | PECO Energy Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Baltimore Gas and Electric Company | Pepco Holdings LLC Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Baltimore Gas and Electric Company | Potomac Electric Power Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Baltimore Gas and Electric Company | Delmarva Power and Light Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Baltimore Gas and Electric Company | Atlantic City Electric Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Baltimore Gas and Electric Company | Other Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Baltimore Gas and Electric Company | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts payable | 48 | 35
Receivables from affiliates | 0 | 0
Pepco Holdings LLC | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Accounts payable | 17 | 15
Pepco Holdings LLC | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts payable | 54 | 59
Receivables from affiliates | 6 | 3
Potomac Electric Power Company | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Accounts payable | 31 | 32
Potomac Electric Power Company | Commonwealth Edison Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Potomac Electric Power Company | PECO Energy Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Potomac Electric Power Company | Baltimore Gas And Electric Company Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Potomac Electric Power Company | Pepco Holdings LLC Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Potomac Electric Power Company | Delmarva Power and Light Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Potomac Electric Power Company | Atlantic City Electric Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 1
Potomac Electric Power Company | Other Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 1
Potomac Electric Power Company | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts payable | 31 | 32
Receivables from affiliates | 0 | 2
Delmarva Power and Light Company | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Accounts payable | 21 | 25
Delmarva Power and Light Company | Commonwealth Edison Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Delmarva Power and Light Company | PECO Energy Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Delmarva Power and Light Company | Baltimore Gas And Electric Company Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Delmarva Power and Light Company | Pepco Holdings LLC Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Delmarva Power and Light Company | Potomac Electric Power Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Delmarva Power and Light Company | Atlantic City Electric Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 1
Delmarva Power and Light Company | Other Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Delmarva Power and Light Company | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts payable | 21 | 25
Receivables from affiliates | 0 | 1
Atlantic City Electric Company | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Accounts payable | 19 | 25
Atlantic City Electric Company | Commonwealth Edison Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Atlantic City Electric Company | PECO Energy Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current |  | 0
Atlantic City Electric Company | Baltimore Gas And Electric Company Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Atlantic City Electric Company | Pepco Holdings LLC Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Atlantic City Electric Company | Potomac Electric Power Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Atlantic City Electric Company | Delmarva Power and Light Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
Atlantic City Electric Company | Other Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 5 | 3
Atlantic City Electric Company | Related Party |  |
Related Party Transaction [Line Items] |  |
Accounts payable | 19 | 25
Receivables from affiliates | 5 | 3
Business Services Company | Commonwealth Edison Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 57 | 64
Business Services Company | PECO Energy Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 30 | 36
Business Services Company | Baltimore Gas And Electric Company Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 32 | 33
Business Services Company | Pepco Holdings LLC Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 6 | 5
Business Services Company | Potomac Electric Power Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 17 | 17
Business Services Company | Delmarva Power and Light Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 10 | 12
Business Services Company | Atlantic City Electric Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 8 | 11
Business Services Company | Other Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 1
Business Services Company | Related Party |  |
Related Party Transaction [Line Items] |  |
Receivables from affiliates | 160 | 179
PHI Service Company | Commonwealth Edison Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
PHI Service Company | PECO Energy Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
PHI Service Company | Baltimore Gas And Electric Company Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
PHI Service Company | Pepco Holdings LLC Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 1 | 0
PHI Service Company | Potomac Electric Power Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 13 | 14
PHI Service Company | Delmarva Power and Light Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 10 | 11
PHI Service Company | Atlantic City Electric Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 10 | 11
PHI Service Company | Other Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 0 | 0
PHI Service Company | Related Party |  |
Related Party Transaction [Line Items] |  |
Receivables from affiliates | 34 | 36
Other Legal Entities | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Accounts payable | 8 | 8
Other Legal Entities | Commonwealth Edison Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 58 | 8
Other Legal Entities | PECO Energy Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 6 | 3
Other Legal Entities | Baltimore Gas And Electric Company Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 15 | 2
Other Legal Entities | Pepco Holdings LLC Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 10 | 10
Other Legal Entities | Potomac Electric Power Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 1 | 1
Other Legal Entities | Delmarva Power and Light Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 1 | 1
Other Legal Entities | Atlantic City Electric Co Affiliate |  |
Related Party Transaction [Line Items] |  |
Related party transaction, due from (to) related party, current | 1 | 0
Other Legal Entities | Related Party |  |
Related Party Transaction [Line Items] |  |
Receivables from affiliates | $ 92 | $ 25

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