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Debt and Credit Agreements - Schedule of Long-term Debt Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
2017 $ 2,430  
2018 1,742  
2019 1,060  
2020 3,331  
2021 2,400  
Thereafter [1] 22,996  
Total 33,959  
Total long-term debt to financing trusts 648 $ 648
Long-term Debt, Gross 33,311 25,113
BGE Trust Member [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 258 258
ComEd Financing Three Affiliate [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 206 206
PECO Financing Trusts [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 184  
Exelon Generation Co L L C [Member]    
Debt Instrument [Line Items]    
2017 1,117  
2018 104  
2019 606  
2020 1,912  
2021 888  
Thereafter 4,581  
Total 9,208  
Long-term Debt, Gross 9,208 8,919
Commonwealth Edison Co [Member]    
Debt Instrument [Line Items]    
2017 425  
2018 840  
2019 300  
2020 500  
2021 350  
Thereafter [2] 4,892  
Total 7,307  
Total long-term debt to financing trusts 206 206
Long-term Debt, Gross 7,101 6,567
Commonwealth Edison Co [Member] | ComEd Financing Three Affiliate [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 206 206
PECO Energy Co [Member]    
Debt Instrument [Line Items]    
2017 0  
2018 500  
2019 0  
2020 0  
2021 300  
Thereafter [3] 1,984  
Total 2,784  
Long-term Debt, Gross 2,600 2,600
Baltimore Gas and Electric Company [Member]    
Debt Instrument [Line Items]    
2017 41  
2018 0  
2019 0  
2020 0  
2021 300  
Thereafter [4] 2,258  
Total 2,599  
Total long-term debt to financing trusts 258 258
Long-term Debt, Gross 2,341 1,870
Baltimore Gas and Electric Company [Member] | BGE Trust Member [Member]    
Debt Instrument [Line Items]    
Total long-term debt to financing trusts 258 258
Pepco Holdings LLC [Member]    
Debt Instrument [Line Items]    
2017 253  
2018 298  
2019 154  
2020 19  
2021 262  
Thereafter 4,171  
Total 5,157  
Long-term Debt, Gross 5,157 5,331
Potomac Electric Power Company [Member]    
Debt Instrument [Line Items]    
2017 16  
2018 13  
2019 124  
2020 0  
2021 2  
Thereafter 2,226  
Total 2,381  
Long-term Debt, Gross 2,381 2,385
Delmarva Power and Light Company [Member]    
Debt Instrument [Line Items]    
2017 119  
2018 4  
2019 12  
2020 0  
2021 0  
Thereafter 1,213  
Total 1,348  
Long-term Debt, Gross 1,348 1,273
Atlantic City Electric Company [Member]    
Debt Instrument [Line Items]    
2017 35  
2018 281  
2019 18  
2020 19  
2021 260  
Thereafter 549  
Total 1,162  
Long-term Debt, Gross 1,162 1,210
Medium-term Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 40 0
Medium-term Notes [Member] | Pepco Holdings LLC [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 40 40
Medium-term Notes [Member] | Delmarva Power and Light Company [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 40 40
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 2,300 1,750
Unsecured Debt [Member] | Pepco Holdings LLC [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 266 456
Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 11,868 9,803
Senior Notes [Member] | Exelon Generation Co L L C [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 5,971 5,971
Senior Notes [Member] | Baltimore Gas and Electric Company [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 2,300 1,750
Transition Bonds [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 124 0
Transition Bonds [Member] | Pepco Holdings LLC [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross [5] 124 171
Transition Bonds [Member] | Atlantic City Electric Company [Member]    
Debt Instrument [Line Items]    
2017 35  
2018 31  
2019 18  
2020 19  
2021 21  
Long-term Debt, Gross [6] 124 171
Rate Stabilization Bonds [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 41 120
Rate Stabilization Bonds [Member] | Baltimore Gas and Electric Company [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 41 120
Pollution Control Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 435 435
Pollution Control Notes [Member] | Exelon Generation Co L L C [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 435 435
Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 105 127
Notes Payable to Banks [Member] | Exelon Generation Co L L C [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 105 127
Notes Payable, Other Payables [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross [7],[8] 576 314
Notes Payable, Other Payables [Member] | Exelon Generation Co L L C [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross [9],[10] 382 166
Notes Payable, Other Payables [Member] | Commonwealth Edison Co [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross [11] 147 148
Notes Payable, Other Payables [Member] | Pepco Holdings LLC [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 46 57
Notes Payable, Other Payables [Member] | Potomac Electric Power Company [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 46 50
Non Recourse Fixed Rate [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 1,400 1,162
Non Recourse Fixed Rate [Member] | Exelon Generation Co L L C [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 1,400 1,162
Non Recourse Variable Rate [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 915 1,058
Non Recourse Variable Rate [Member] | Exelon Generation Co L L C [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 915 $ 1,058
[1] Includes $648 million due to ComEd, PECO and BGE financing trusts.
[2] Includes $206 million due to ComEd financing trust.
[3] Includes $184 million due to PECO financing trusts.
[4] Includes $258 million due to BGE financing trust.
[5] Transition bonds are recorded as part of Long-term debt within ACE's Consolidated Balance Sheets.
[6] Substantially all of ACE's assets are subject to the lien of its respective mortgage indenture.
[7] Includes capital lease obligations of $69 million and $29 million at December 31, 2016 and 2015, respectively. Lease payments of $17 million, $18 million, $20 million, $5 million, $1 million, and $8 million will be made in 2017, 2018, 2019, 2020, 2021 and thereafter, respectively.
[8] Includes financing related to Albany Green Energy, LLC (AGE), which is a consolidated variable interest entity (see Note 2 - Variable Interest Entities for additional information). The agreement is scheduled to expire on November 17, 2017, at a variable rate equal to LIBOR plus 1.25%. As of December 31, 2016, $198 million was outstanding.
[9] Includes Generation’s capital lease obligations of $22 million and $21 million at December 31, 2016 and 2015, respectively. Generation will make lease payments of $5 million, $5 million, $6 million and $5 million and $1 million in 2017, 2018, 2019, 2020 and 2021 respectively. The capital lease matures in 2020.
[10] Includes financing related to Albany Green Energy, LLC (AGE), which is a consolidated variable interest entity (see Note 2 - Variable Interest Entities for additional information). The agreement is scheduled to expire on November 17, 2017, at a variable rate equal to LIBOR plus 1.25%. As of December 31, 2016, $198 million was outstanding.
[11] Includes ComEd’s capital lease obligations of $8 million at both December 31, 2016 and 2015, respectively. Lease payments of less than $1 million will be made from 2017 through expiration at 2053.