v3.26.1
Related Party Transactions - Current Receivables From/Payables To Affiliates (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Related Party    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current $ 263 $ 279
Accounts payable 5 5
Commonwealth Edison Co | Affiliated Entity    
Related Party Transaction [Line Items]    
Accounts payable 75 81
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 0 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 5 5
Commonwealth Edison Co | Related Party    
Related Party Transaction [Line Items]    
Accounts payable 75 81
Receivables from affiliates 5 5
PECO Energy Co | Affiliated Entity    
Related Party Transaction [Line Items]    
Accounts payable 36 35
PECO Energy Co | Commonwealth Edison Co Affiliate    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current 0 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 0
PECO Energy Co | Atlantic City Electric Co Affiliate    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current 0 0
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 35
Receivables from affiliates 0 0
Baltimore Gas and Electric Company | Affiliated Entity    
Related Party Transaction [Line Items]    
Accounts payable 39 39
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 1
Baltimore Gas and Electric Company | Related Party    
Related Party Transaction [Line Items]    
Accounts payable 39 39
Receivables from affiliates 0 1
Pepco Holdings LLC | Affiliated Entity    
Related Party Transaction [Line Items]    
Accounts payable 11 18
Pepco Holdings LLC | Related Party    
Related Party Transaction [Line Items]    
Accounts payable 61 71
Receivables from affiliates 5 14
Potomac Electric Power Company | Affiliated Entity    
Related Party Transaction [Line Items]    
Accounts payable 41 37
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 0
Potomac Electric Power Company | Other Affiliate    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current 0 0
Potomac Electric Power Company | Related Party    
Related Party Transaction [Line Items]    
Accounts payable 41 37
Receivables from affiliates 0 0
Delmarva Power and Light Company | Affiliated Entity    
Related Party Transaction [Line Items]    
Accounts payable 28 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 0
Delmarva Power and Light Company | Other Affiliate    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current 4 2
Delmarva Power and Light Company | Related Party    
Related Party Transaction [Line Items]    
Accounts payable 28 25
Receivables from affiliates 4 2
Atlantic City Electric Company | Affiliated Entity    
Related Party Transaction [Line Items]    
Accounts payable 23 24
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 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 1 12
Atlantic City Electric Company | Related Party    
Related Party Transaction [Line Items]    
Accounts payable 23 24
Receivables from affiliates 1 12
Business Services Company | Commonwealth Edison Co Affiliate    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current 69 76
Business Services Company | PECO Energy Co Affiliate    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current 33 33
Business Services Company | Baltimore Gas And Electric Company Affiliate    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current 38 39
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 22 25
Business Services Company | Delmarva Power and Light Co Affiliate    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current 14 15
Business Services Company | Atlantic City Electric Co Affiliate    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current 11 14
Business Services Company | Other Affiliate    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current 0 0
Business Services Company | Related Party    
Related Party Transaction [Line Items]    
Receivables from affiliates 193 207
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 0 2
PHI Service Company | Potomac Electric Power Co Affiliate    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current 18 11
PHI Service Company | Delmarva Power and Light Co Affiliate    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current 13 10
PHI Service Company | Atlantic City Electric Co Affiliate    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current 11 10
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 42 33
Other Legal Entities | Affiliated Entity    
Related Party Transaction [Line Items]    
Accounts payable 10 20
Other Legal Entities | Commonwealth Edison Co Affiliate    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current 6 5
Other Legal Entities | PECO Energy Co Affiliate    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current 3 2
Other Legal Entities | Baltimore Gas And Electric Company Affiliate    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current 1 0
Other Legal Entities | Pepco Holdings LLC Affiliate    
Related Party Transaction [Line Items]    
Related party transaction, due from (to) related party, current 5 11
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 0
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 $ 18 $ 19