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Income Taxes - Reconciliation to Effective Tax Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items] |  |  |  |
U.S. Federal statutory rate | 21.00% | 21.00% | 21.00% | 21.00%
State income taxes, net of federal income tax benefit (d) | 5.70% | (2.70%) | 5.80% | 2.80%
Plant basis differences | (4.80%) | (4.40%) | (4.20%) | (4.30%)
Excess deferred tax amortization | (14.00%) | (6.40%) | (14.10%) | (6.60%)
Amortization of investment tax credit, including deferred taxes on basis difference | (0.10%) | (0.10%) | (0.10%) | (0.10%)
Tax credits | (0.90%) | (0.50%) | (0.60%) | (0.50%)
Other | (0.30%) | 1.80% | 0.20% | 1.50%
Effective income tax rate | 6.60% | 8.70% | 8.00% | 13.80%
Federal and State |  |  |  |
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items] |  |  |  |
Effective income tax rate reconciliation, state and local income taxes, amount | $ (54) |  | $ (54) |
Commonwealth Edison Co |  |  |  |
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items] |  |  |  |
U.S. Federal statutory rate | 21.00% | 21.00% | 21.00% | 21.00%
State income taxes, net of federal income tax benefit (d) | 7.60% | 7.80% | 7.70% | 7.80%
Plant basis differences | (0.80%) | (0.40%) | (0.80%) | (0.40%)
Excess deferred tax amortization | (16.60%) | (5.30%) | (17.40%) | (5.50%)
Amortization of investment tax credit, including deferred taxes on basis difference | (0.10%) | (0.10%) | (0.10%) | (0.10%)
Tax credits | (2.60%) | (1.20%) | (1.40%) | (0.70%)
Other | 0.60% | 0.20% | 0.40% | 0.10%
Effective income tax rate | 9.10% | 22.00% | 9.40% | 22.20%
PECO Energy Co |  |  |  |
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items] |  |  |  |
U.S. Federal statutory rate | 21.00% | 21.00% | 21.00% | 21.00%
State income taxes, net of federal income tax benefit (d) | (2.10%) | (1.20%) | (1.20%) | (1.30%)
Plant basis differences | (19.50%) | (15.60%) | (14.70%) | (15.50%)
Excess deferred tax amortization | (2.60%) | (2.40%) | (2.40%) | (2.40%)
Amortization of investment tax credit, including deferred taxes on basis difference | 0.00% | 0.00% | 0.00% | 0.00%
Tax credits | 0.00% | 0.00% | 0.00% | 0.00%
Other | (0.30%) | 0.20% | (0.20%) | 0.10%
Effective income tax rate | (3.50%) | 2.00% | 2.50% | 1.90%
Baltimore Gas and Electric Company |  |  |  |
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items] |  |  |  |
U.S. Federal statutory rate | 21.00% | 21.00% | 21.00% | 21.00%
State income taxes, net of federal income tax benefit (d) | 6.50% | 6.60% | 6.30% | 6.50%
Plant basis differences | (0.80%) | (0.20%) | (1.20%) | (0.50%)
Excess deferred tax amortization | (18.60%) | (5.40%) | (17.60%) | (5.40%)
Amortization of investment tax credit, including deferred taxes on basis difference | (0.10%) | (0.10%) | 0.00% | (0.10%)
Tax credits | (0.60%) | (2.00%) | (0.40%) | (0.70%)
Other | 0.80% | (0.30%) | 0.20% | 0.20%
Effective income tax rate | 8.20% | 19.60% | 8.30% | 21.00%
Pepco Holdings LLC |  |  |  |
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items] |  |  |  |
U.S. Federal statutory rate | 21.00% | 21.00% | 21.00% | 21.00%
State income taxes, net of federal income tax benefit (d) | 6.50% | 6.20% | 6.50% | 6.10%
Plant basis differences | (0.80%) | (1.50%) | (0.90%) | (1.60%)
Excess deferred tax amortization | (5.50%) | (8.00%) | (5.40%) | (7.70%)
Amortization of investment tax credit, including deferred taxes on basis difference | (0.10%) | (0.10%) | (0.10%) | (0.10%)
Tax credits | (0.60%) | (0.50%) | (0.50%) | (0.60%)
Other | 0.10% | 0.30% | 0.20% | 0.30%
Effective income tax rate | 20.60% | 17.40% | 20.80% | 17.40%
Potomac Electric Power Company |  |  |  |
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items] |  |  |  |
U.S. Federal statutory rate | 21.00% | 21.00% | 21.00% | 21.00%
State income taxes, net of federal income tax benefit (d) | 6.20% | 5.50% | 6.20% | 5.50%
Plant basis differences | (1.20%) | (2.40%) | (1.30%) | (2.50%)
Excess deferred tax amortization | (6.70%) | (9.20%) | (6.80%) | (9.20%)
Amortization of investment tax credit, including deferred taxes on basis difference | 0.00% | 0.00% | 0.00% | 0.00%
Tax credits | (0.50%) | (0.60%) | (0.40%) | (0.70%)
Other | (0.20%) | 0.60% | (0.10%) | 0.60%
Effective income tax rate | 18.60% | 14.90% | 18.60% | 14.70%
Delmarva Power and Light Company |  |  |  |
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items] |  |  |  |
U.S. Federal statutory rate | 21.00% | 21.00% | 21.00% | 21.00%
State income taxes, net of federal income tax benefit (d) | 6.30% | 6.10% | 6.20% | 6.20%
Plant basis differences | (0.80%) | (0.90%) | (0.90%) | (1.00%)
Excess deferred tax amortization | (5.90%) | (10.00%) | (5.80%) | (9.40%)
Amortization of investment tax credit, including deferred taxes on basis difference | (0.10%) | (0.10%) | (0.10%) | (0.10%)
Tax credits | (0.60%) | (0.40%) | (0.40%) | (0.40%)
Other | 0.40% | 0.00% | 0.00% | 0.00%
Effective income tax rate | 20.30% | 15.70% | 20.00% | 16.30%
Atlantic City Electric Company |  |  |  |
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate [Line Items] |  |  |  |
U.S. Federal statutory rate | 21.00% | 21.00% | 21.00% | 21.00%
State income taxes, net of federal income tax benefit (d) | 7.40% | 7.00% | 7.40% | 6.90%
Plant basis differences | 0.00% | (0.50%) | 0.10% | (0.50%)
Excess deferred tax amortization | (1.60%) | (3.10%) | (1.60%) | (2.60%)
Amortization of investment tax credit, including deferred taxes on basis difference | (0.10%) | (0.10%) | (0.10%) | (0.10%)
Tax credits | (0.50%) | (0.30%) | (0.40%) | (0.30%)
Other | 0.30% | 0.50% | 0.10% | 0.30%
Effective income tax rate | 26.50% | 24.50% | 26.50% | 24.70%

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