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Supplemental Financial Information - Balance Sheet (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |  |
Cash and cash equivalents | $ 616 | $ 445 | $ 300 | $ 407
Restricted cash | 552 | 482 | 435 | 566
Restricted cash included in other long-term assets | 65 | 174 | 212 | 117
Total cash, restricted cash, and cash equivalents | 1,233 | 1,101 | 947 | 1,090
Accrued Expenses [Abstract] |  |  |  |
Compensation-related accruals | 546 | 661 |  |
Taxes accrued | 203 | 221 |  |
Interest accrued | 431 | 414 |  |
Other | 569 | 557 |  |
Commonwealth Edison Co |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |  |
Cash and cash equivalents | 109 | 110 | 79 | 67
Restricted cash | 481 | 402 | 360 | 327
Restricted cash included in other long-term assets | 65 | 174 | 212 | 117
Total cash, restricted cash, and cash equivalents | 655 | 686 | 651 | 511
Accrued Expenses [Abstract] |  |  |  |
Compensation-related accruals | 165 | 206 |  |
Taxes accrued | 89 | 204 |  |
Interest accrued | 92 | 148 |  |
PECO Energy Co |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |  |
Cash and cash equivalents | 28 | 42 | 43 | 59
Restricted cash | 9 | 9 | 9 | 9
Restricted cash included in other long-term assets | 0 | 0 | 0 | 0
Total cash, restricted cash, and cash equivalents | 37 | 51 | 52 | 68
Accrued Expenses [Abstract] |  |  |  |
Compensation-related accruals | 68 | 87 |  |
Taxes accrued | 19 | 96 |  |
Interest accrued | 55 | 49 |  |
Baltimore Gas and Electric Company |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |  |
Cash and cash equivalents | 330 | 47 | 15 | 43
Restricted cash | 0 | 1 | 1 | 24
Restricted cash included in other long-term assets | 0 | 0 | 0 | 0
Total cash, restricted cash, and cash equivalents | 330 | 48 | 16 | 67
Accrued Expenses [Abstract] |  |  |  |
Compensation-related accruals | 70 | 81 |  |
Taxes accrued | 28 | 75 |  |
Interest accrued | 74 | 44 |  |
Other | 48 | 9 |  |
Pepco Holdings LLC |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |  |
Cash and cash equivalents | 100 | 180 | 121 | 198
Restricted cash | 22 | 24 | 25 | 175
Restricted cash included in other long-term assets | 0 | 0 | 0 | 0
Total cash, restricted cash, and cash equivalents | 122 | 204 | 146 | 373
Accrued Expenses [Abstract] |  |  |  |
Compensation-related accruals | 100 | 107 |  |
Taxes accrued | 101 | 137 |  |
Interest accrued | 85 | 72 |  |
Potomac Electric Power Company |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |  |
Cash and cash equivalents | 20 | 48 | 31 | 45
Restricted cash | 20 | 24 | 25 | 54
Restricted cash included in other long-term assets | 0 | 0 | 0 | 0
Total cash, restricted cash, and cash equivalents | 40 | 72 | 56 | 99
Accrued Expenses [Abstract] |  |  |  |
Compensation-related accruals | 28 | 27 |  |
Taxes accrued | 89 | 116 |  |
Interest accrued | 38 | 38 |  |
Delmarva Power and Light Company |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |  |
Cash and cash equivalents | 8 | 16 | 5 | 31
Restricted cash | 2 | 0 | 1 | 121
Restricted cash included in other long-term assets | 0 | 0 | 0 | 0
Total cash, restricted cash, and cash equivalents | 10 | 16 | 6 | 152
Accrued Expenses [Abstract] |  |  |  |
Compensation-related accruals | 19 | 17 |  |
Taxes accrued | 15 | 30 |  |
Interest accrued | 27 | 13 |  |
Atlantic City Electric Company |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |  |
Cash and cash equivalents | 17 | 21 | 14 | 72
Restricted cash | 0 | 0 | 0 | 0
Restricted cash included in other long-term assets | 0 | 0 | 0 | 0
Total cash, restricted cash, and cash equivalents | 17 | 21 | $ 14 | $ 72
Accrued Expenses [Abstract] |  |  |  |
Compensation-related accruals | 12 | 12 |  |
Taxes accrued | 5 | 10 |  |
Interest accrued | $ 18 | $ 15 |  |

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