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Accounts Receivable - Purchases and Sales of Accounts Receivable (Detail) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, Purchase | $ 3,177 | $ 3,124
Commonwealth Edison Co |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, Purchase | 750 | 726
PECO Energy Co |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, Purchase | 854 | 843
Baltimore Gas and Electric Company |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, Purchase | 606 | 628
Pepco Holdings LLC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, Purchase | 967 | 927
Potomac Electric Power Company |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, Purchase | 607 | 600
Delmarva Power and Light Company |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, Purchase | 191 | 174
Atlantic City Electric Company |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts Receivable, Purchase | $ 169 | $ 153

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