v3.26.3
Income Taxes - Reconciliation to Effective Tax Rate (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 186 $ 217 $ 525 $ 540
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount 48 58 142 143
Effective Income Tax Rate Reconciliation, Tax Credit, Amount 1 4 6 11
Unrecognized Tax Benefits, Period Increase (Decrease) 2   (15)  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount (10) 4 6 9
Effective Income Tax Rate Reconciliation, Plant Flow Through (36) (52) (110) (118)
Effective Income Tax Rate Reconciliation, Amortization Of Excess Deferred Taxes, Amount (35) (68) (87) (166)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount 0 0 (1) (1)
Income taxes $ 154 $ 155 $ 454 $ 396
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
U.S. Federal statutory rate 21.00% 21.00% 21.00% 21.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 5.40% 5.60% 5.70% 5.60%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent 0.10% 0.40% 0.20% 0.50%
Change in Unrecognized Tax Benefits, Percent 0.20%   (0.60%)  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent (1.10%) 0.40% 0.20% 0.40%
Effective Income Tax Rate Reconciliation, Plant Flow Through, Percent (4.00%) (5.00%) (4.40%) (4.60%)
Effective Income Tax Rate Reconciliation, Amortization Of Excess Deferred Taxes, Percent (4.00%) (6.60%) (3.50%) (6.50%)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent 0.00% 0.00% 0.00% 0.00%
Effective Income Tax Rate Reconciliation, Percent 17.40% 15.00% 18.20% 15.40%
Commonwealth Edison Co        
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 115 $ 96 $ 271 $ 232
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount 40 34 95 83
Effective Income Tax Rate Reconciliation, Tax Credit, Amount 1 1 2 5
Unrecognized Tax Benefits, Period Increase (Decrease) 0   (2)  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount 1 1 2 1
Effective Income Tax Rate Reconciliation, Plant Flow Through (6) (4) (15) (10)
Effective Income Tax Rate Reconciliation, Amortization Of Excess Deferred Taxes, Amount (10) (42) (24) (99)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount (1) (1) (1) (1)
Income taxes $ 140 $ 83 $ 324 $ 201
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
U.S. Federal statutory rate 21.00% 21.00% 21.00% 21.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 7.30% 7.50% 7.40% 7.50%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent 0.20% 0.20% 0.20% 0.50%
Change in Unrecognized Tax Benefits, Percent 0.00%   (0.20%)  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent 0.20% 0.20% 0.30% 0.10%
Effective Income Tax Rate Reconciliation, Plant Flow Through, Percent (1.10%) (0.90%) (1.20%) (0.90%)
Effective Income Tax Rate Reconciliation, Amortization Of Excess Deferred Taxes, Percent (1.80%) (9.20%) (1.90%) (8.90%)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent (0.20%) (0.20%) (0.10%) (0.10%)
Effective Income Tax Rate Reconciliation, Percent 25.60% 18.20% 25.10% 18.20%
PECO Energy Co        
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 36 $ 54 $ 124 $ 142
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount (2) (3) (6) (15)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount 0 0 0 0
Unrecognized Tax Benefits, Period Increase (Decrease) 0   0  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount 0 0 1 1
Effective Income Tax Rate Reconciliation, Plant Flow Through (24) (41) (79) (94)
Effective Income Tax Rate Reconciliation, Amortization Of Excess Deferred Taxes, Amount (2) (5) (9) (11)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount 0 0 0 0
Income taxes $ 8 $ 5 $ 31 $ 23
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
U.S. Federal statutory rate 21.00% 21.00% 21.00% 21.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent (1.20%) (1.20%) (1.00%) (2.20%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent 0.00% 0.00% 0.00% 0.00%
Change in Unrecognized Tax Benefits, Percent 0.00%   0.00%  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent 0.00% 0.00% 0.20% 0.10%
Effective Income Tax Rate Reconciliation, Plant Flow Through, Percent (13.90%) (15.80%) (13.30%) (13.90%)
Effective Income Tax Rate Reconciliation, Amortization Of Excess Deferred Taxes, Percent (1.30%) (2.00%) (1.70%) (1.60%)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent 0.00% 0.00% 0.00% 0.00%
Effective Income Tax Rate Reconciliation, Percent 4.60% 2.00% 5.20% 3.40%
Baltimore Gas and Electric Company        
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 24 $ 22 $ 118 $ 106
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount 7 7 34 32
Effective Income Tax Rate Reconciliation, Tax Credit, Amount 1 0 2 2
Unrecognized Tax Benefits, Period Increase (Decrease) 0   (1)  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount 0 0 1 0
Effective Income Tax Rate Reconciliation, Plant Flow Through (2) (1) (10) (7)
Effective Income Tax Rate Reconciliation, Amortization Of Excess Deferred Taxes, Amount (5) (5) (21) (21)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount 0 0 0 0
Income taxes $ 23 $ 23 $ 119 $ 108
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
U.S. Federal statutory rate 21.00% 21.00% 21.00% 21.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 6.20% 6.70% 6.00% 6.30%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent 0.90% 0.00% 0.40% 0.40%
Change in Unrecognized Tax Benefits, Percent 0.00%   (0.20%)  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent 0.00% 0.00% 0.30% 0.00%
Effective Income Tax Rate Reconciliation, Plant Flow Through, Percent (1.80%) (1.00%) (1.80%) (1.40%)
Effective Income Tax Rate Reconciliation, Amortization Of Excess Deferred Taxes, Percent (4.10%) (4.80%) (3.70%) (4.20%)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent 0.00% 0.00% 0.00% 0.00%
Effective Income Tax Rate Reconciliation, Percent 20.40% 21.90% 21.20% 21.30%
Pepco Holdings LLC        
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 49 $ 78 $ 124 $ 170
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount 17 25 40 54
Effective Income Tax Rate Reconciliation, Tax Credit, Amount 1 1 2 3
Unrecognized Tax Benefits, Period Increase (Decrease) 0   0  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount 0 0 1 1
Effective Income Tax Rate Reconciliation, Plant Flow Through (3) (2) (6) (5)
Effective Income Tax Rate Reconciliation, Amortization Of Excess Deferred Taxes, Amount (16) (15) (32) (33)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount 0 0 0 0
Income taxes $ 46 $ 85 $ 125 $ 184
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
U.S. Federal statutory rate 21.00% 21.00% 21.00% 21.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 7.30% 6.60% 6.80% 6.70%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent 0.40% 0.30% 0.30% 0.40%
Change in Unrecognized Tax Benefits, Percent 0.00%   0.00%  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent 0.00% 0.00% 0.20% 0.10%
Effective Income Tax Rate Reconciliation, Plant Flow Through, Percent (1.30%) (0.50%) (1.00%) (0.60%)
Effective Income Tax Rate Reconciliation, Amortization Of Excess Deferred Taxes, Percent (6.90%) (4.20%) (5.50%) (4.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent 0.00% 0.00% 0.00% 0.00%
Effective Income Tax Rate Reconciliation, Percent 19.70% 22.60% 21.20% 22.70%
Potomac Electric Power Company        
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 7 $ 41 $ 42 $ 89
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount 2 13 12 27
Effective Income Tax Rate Reconciliation, Tax Credit, Amount 1 0 1 1
Unrecognized Tax Benefits, Period Increase (Decrease) 0   0  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount 0 (1) 0 0
Effective Income Tax Rate Reconciliation, Plant Flow Through (2) (2) (4) (4)
Effective Income Tax Rate Reconciliation, Amortization Of Excess Deferred Taxes, Amount (10) (10) (20) (22)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount 0 0 0 0
Income taxes $ (4) $ 41 $ 29 $ 89
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
U.S. Federal statutory rate 21.00% 21.00% 21.00% 21.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 5.60% 6.60% 5.90% 6.30%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent 2.80% 0.00% 0.50% 0.20%
Change in Unrecognized Tax Benefits, Percent 0.00%   0.00%  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent 0.00% (0.50%) 0.00% 0.00%
Effective Income Tax Rate Reconciliation, Plant Flow Through, Percent (5.60%) (1.00%) (2.00%) (0.90%)
Effective Income Tax Rate Reconciliation, Amortization Of Excess Deferred Taxes, Percent (29.30%) (5.30%) (10.00%) (5.30%)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent 0.00% 0.00% 0.00% 0.00%
Effective Income Tax Rate Reconciliation, Percent (11.10%) 20.80% 14.40% 20.90%
Delmarva Power and Light Company        
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 17 $ 15 $ 45 $ 45
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount 4 5 13 14
Effective Income Tax Rate Reconciliation, Tax Credit, Amount 0 1 0 1
Unrecognized Tax Benefits, Period Increase (Decrease) 0   0  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount 0 0 0 0
Effective Income Tax Rate Reconciliation, Plant Flow Through 0 0 (1) (1)
Effective Income Tax Rate Reconciliation, Amortization Of Excess Deferred Taxes, Amount (2) (2) (8) (8)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount 0 0 0 0
Income taxes $ 19 $ 17 $ 49 $ 49
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
U.S. Federal statutory rate 21.00% 21.00% 21.00% 21.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 5.00% 6.90% 6.10% 6.60%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent 0.00% 1.40% 0.00% 0.50%
Change in Unrecognized Tax Benefits, Percent 0.00%   0.00%  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent 0.00% 0.00% 0.00% 0.00%
Effective Income Tax Rate Reconciliation, Plant Flow Through, Percent 0.00% 0.00% (0.50%) (0.50%)
Effective Income Tax Rate Reconciliation, Amortization Of Excess Deferred Taxes, Percent (2.20%) (2.90%) (3.60%) (3.50%)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent 0.00% 0.00% 0.00% 0.00%
Effective Income Tax Rate Reconciliation, Percent 23.80% 23.60% 23.00% 23.10%
Atlantic City Electric Company        
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]        
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 25 $ 23 $ 39 $ 39
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount 8 8 13 13
Effective Income Tax Rate Reconciliation, Tax Credit, Amount 0 1 0 1
Unrecognized Tax Benefits, Period Increase (Decrease) 0   0  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount 0 0 0 0
Effective Income Tax Rate Reconciliation, Plant Flow Through 0 0 0 0
Effective Income Tax Rate Reconciliation, Amortization Of Excess Deferred Taxes, Amount (1) (1) (4) (3)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount 0 0 0 0
Income taxes $ 32 $ 29 $ 48 $ 48
Effective Income Tax Rate Reconciliation, Percent [Abstract]        
U.S. Federal statutory rate 21.00% 21.00% 21.00% 21.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 6.60% 7.20% 7.00% 7.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent 0.00% 0.90% 0.00% 0.50%
Change in Unrecognized Tax Benefits, Percent 0.00%   0.00%  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent 0.00% 0.00% 0.00% 0.00%
Effective Income Tax Rate Reconciliation, Plant Flow Through, Percent 0.00% 0.00% 0.00% 0.00%
Effective Income Tax Rate Reconciliation, Amortization Of Excess Deferred Taxes, Percent (1.40%) (1.20%) (2.30%) (1.70%)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent 0.00% 0.00% 0.00% 0.00%
Effective Income Tax Rate Reconciliation, Percent 26.20% 26.10% 25.70% 25.80%