v3.25.2
Fair Value of Financial Assets and Liabilities - Fair Value of Financial Liabilities Recorded at Amortized Cost (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Reported Value Measurement [Member] | Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts $ 390 $ 390
Reported Value Measurement [Member] | Nonrelated Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 47,345 44,400
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 42,715 39,057
Estimate of Fair Value Measurement [Member] | Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts 397 396
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 38,504 35,337
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 4,211 3,720
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts 397 396
Long-term debt to financing trusts 390 390
Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts 390 390
Commonwealth Edison Co | Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 12,750 12,030
Commonwealth Edison Co | Reported Value Measurement [Member] | Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts 206 206
Commonwealth Edison Co | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 11,157 10,260
Commonwealth Edison Co | Estimate of Fair Value Measurement [Member] | Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts 210 208
Commonwealth Edison Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 0 0
Commonwealth Edison Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts 0 0
Commonwealth Edison Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 11,157 10,260
Commonwealth Edison Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts 0 0
Commonwealth Edison Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 0 0
Commonwealth Edison Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts 210 208
Commonwealth Edison Co | Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts 206 206
PECO Energy Co | Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 5,705 5,704
PECO Energy Co | Reported Value Measurement [Member] | Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts 184 184
PECO Energy Co | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 4,852 4,816
PECO Energy Co | Estimate of Fair Value Measurement [Member] | Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts 186 188
PECO Energy Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 0 0
PECO Energy Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts 0 0
PECO Energy Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 4,852 4,816
PECO Energy Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts 0 0
PECO Energy Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 0 0
PECO Energy Co | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts 186 188
PECO Energy Co | Related Party    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt to financing trusts 184 184
Baltimore Gas and Electric Company | Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 6,040 5,395
Baltimore Gas and Electric Company | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 5,435 4,702
Baltimore Gas and Electric Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 0 0
Baltimore Gas and Electric Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 5,435 4,702
Baltimore Gas and Electric Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 0 0
Pepco Holdings LLC | Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 9,535 9,124
Pepco Holdings LLC | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 8,393 7,813
Pepco Holdings LLC | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 0 0
Pepco Holdings LLC | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 4,182 4,093
Pepco Holdings LLC | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 4,211 3,720
Potomac Electric Power Company | Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 4,558 4,362
Potomac Electric Power Company | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 4,287 4,019
Potomac Electric Power Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 0 0
Potomac Electric Power Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 2,517 2,475
Potomac Electric Power Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 1,770 1,544
Delmarva Power and Light Company | Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 2,346 2,220
Delmarva Power and Light Company | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 2,040 1,873
Delmarva Power and Light Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 0 0
Delmarva Power and Light Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 641 623
Delmarva Power and Light Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 1,399 1,250
Atlantic City Electric Company | Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 2,035 1,933
Atlantic City Electric Company | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 1,851 1,712
Atlantic City Electric Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 0 0
Atlantic City Electric Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) 809 787
Atlantic City Electric Company | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt (including amounts due within one year) $ 1,042 $ 925