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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%