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Debt and Credit Agreements - Schedule of Long-term Debt Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
2019 $ 1,349  
2020 3,528  
2021 1,511  
2022 3,084  
2023 850  
Thereafter [1] 24,979  
Total 35,301  
Long-term debt to financing trusts 390 $ 389
ComEd Financing III Affiliate [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts 206 205
Exelon Generation Co L L C [Member]    
Debt Instrument [Line Items]    
2019 906  
2020 2,108  
2021 1  
2022 1,024  
2023 0  
Thereafter 4,720  
Total 8,759  
Commonwealth Edison Co [Member]    
Debt Instrument [Line Items]    
2019 300  
2020 500  
2021 350  
2022 0  
2023 0  
Thereafter [2] 7,243  
Total 8,393  
Long-term debt to financing trusts 205 205
Commonwealth Edison Co [Member] | ComEd Financing III Affiliate [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts 205 205
PECO Energy Co [Member]    
Debt Instrument [Line Items]    
2019 0  
2020 0  
2021 300  
2022 350  
2023 50  
Thereafter [3] 2,609  
Total 3,309  
Long-term debt to financing trusts [4] 184 184
Baltimore Gas and Electric Company [Member]    
Debt Instrument [Line Items]    
2019 0  
2020 0  
2021 300  
2022 250  
2023 300  
Thereafter 2,050  
Total 2,900  
Pepco Holdings LLC [Member]    
Debt Instrument [Line Items]    
2019 125  
2020 20  
2021 261  
2022 310  
2023 500  
Thereafter 4,420  
Total 5,636  
Potomac Electric Power Company [Member]    
Debt Instrument [Line Items]    
2019 15  
2020 0  
2021 1  
2022 310  
2023 0  
Thereafter 2,425  
Total 2,751  
Delmarva Power & Light Company [Member]    
Debt Instrument [Line Items]    
2019 91  
2020 0  
2021 0  
2022 0  
2023 500  
Thereafter 913  
Total 1,504  
Atlantic City Electric Company [Member]    
Debt Instrument [Line Items]    
2019 18  
2020 20  
2021 260  
2022 0  
2023 0  
Thereafter 898  
Total 1,196  
Capital Lease Obligations [Member]    
Debt Instrument [Line Items]    
Capital Leases, Future Minimum Payments Due Thereafter 0  
Capital Lease Obligations [Member] | Exelon Generation Co L L C [Member]    
Debt Instrument [Line Items]    
Capital Leases, Future Minimum Payments Due Thereafter 0  
Long-term Debt [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts 390 390
Long-term Debt [Member] | ComEd Financing III Affiliate [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts [5] 206 206
Long-term Debt [Member] | Commonwealth Edison Co [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts 206 206
Long-term Debt [Member] | Commonwealth Edison Co [Member] | ComEd Financing III Affiliate [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts [6] 206 $ 206
Long-term Debt [Member] | PECO Energy Co [Member] | PECO Financing Trusts [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts $ 184  
Minimum [Member] | Tax-exempt Money Market Funds [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 1.74%  
Minimum [Member] | Tax-exempt Money Market Funds [Member] | Pepco Holdings LLC [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 1.74%  
Minimum [Member] | Tax-exempt Money Market Funds [Member] | Delmarva Power & Light Company [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 1.74%  
Maximum [Member] | Tax-exempt Money Market Funds [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.40%  
Maximum [Member] | Tax-exempt Money Market Funds [Member] | Pepco Holdings LLC [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.40%  
Maximum [Member] | Tax-exempt Money Market Funds [Member] | Delmarva Power & Light Company [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 5.40%  
Maximum [Member] | Long-term Debt [Member] | ComEd Financing III Affiliate [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [5] 6.35%  
Maximum [Member] | Long-term Debt [Member] | Commonwealth Edison Co [Member] | ComEd Financing III Affiliate [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [6] 6.35%  
[1] Includes $390 million due to ComEd and PECO financing trusts.
[2] Includes $206 million due to ComEd financing trust.
[3] Includes $184 million due to PECO financing trusts.
[4] Amounts owed to this financing trust are recorded as Long-term debt to financing trusts within PECO’s Consolidated Balance Sheets.
[5] Amounts owed to these financing trusts are recorded as Long-term debt to financing trusts within Exelon’s Consolidated Balance Sheets.
[6] Amount owed to this financing trust is recorded as Long-term debt to financing trust within ComEd’s Consolidated Balance Sheets.