v3.26.1
Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Feb. 18, 2026
Aug. 16, 2022
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Income Tax Narrative Information [Line Items]          
Other accounts receivable, net     $ 1,200   $ 1,785
Tax Year 2024          
Income Tax Narrative Information [Line Items]          
Income Taxes Receivable, Current $ 80        
Tax Year 2023          
Income Tax Narrative Information [Line Items]          
Income Taxes Receivable, Current 80        
Constellation Energy Corp          
Income Tax Narrative Information [Line Items]          
Other Income $ 235        
Constellation Energy Corp          
Income Tax Narrative Information [Line Items]          
Notes payable, current     99    
Notes payable, noncurrent     279    
Constellation Energy Corp | General Business Tax Credit Carryforward          
Income Tax Narrative Information [Line Items]          
Separation Cash Received       $ 235  
Separation Cash Payment     53    
Constellation Energy Corp | Indemnification for Taxes          
Income Tax Narrative Information [Line Items]          
Other accounts receivable, net     0    
Other Liabilities     0    
Constellation Energy Corp | Tax Refunds          
Income Tax Narrative Information [Line Items]          
Other accounts receivable, net     0    
Other Liabilities     0    
Commonwealth Edison Co          
Income Tax Narrative Information [Line Items]          
Other accounts receivable, net     433   1,132
PECO Energy Co          
Income Tax Narrative Information [Line Items]          
Other accounts receivable, net     136   126
Baltimore Gas and Electric Company          
Income Tax Narrative Information [Line Items]          
Other accounts receivable, net     88   96
Pepco Holdings LLC          
Income Tax Narrative Information [Line Items]          
Other accounts receivable, net     260   243
Potomac Electric Power Company          
Income Tax Narrative Information [Line Items]          
Other accounts receivable, net     140   128
Delmarva Power and Light Company          
Income Tax Narrative Information [Line Items]          
Other accounts receivable, net     61   65
Atlantic City Electric Company          
Income Tax Narrative Information [Line Items]          
Other accounts receivable, net     $ 58   $ 51
US Treasury (UST) Interest Rate          
Income Tax Narrative Information [Line Items]          
Nontaxable or nondeductible items   15.00%