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Debt and Credit Agreements - Schedule of Long-term Debt Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
2015 $ 1,487  
2016 1,841  
2017 1,393  
2018 973  
2019 3,311  
Thereafter [1] 16,756  
Total 25,761  
Long-term debt to financing trusts [2] 641 $ 641
BGE Trust Member [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts [2] 258 258
ComEd Financing Three Affiliate [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts [2] 206 206
PECO Financing Trusts [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts [2] 184  
Exelon Generation Co L L C [Member]    
Debt Instrument [Line Items]    
2015 90  
2016 805  
2017 53  
2018 673  
2019 1,911  
Thereafter 5,387  
Total 8,919  
Long-term debt to financing trusts 933 943
Commonwealth Edison Co [Member]    
Debt Instrument [Line Items]    
2015 665  
2016 425  
2017 840  
2018 300  
2019 500  
Thereafter [3] 4,043  
Total 6,773  
Long-term debt to financing trusts 205 205
Commonwealth Edison Co [Member] | ComEd Financing Three Affiliate [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts 206  
PECO Energy Co [Member]    
Debt Instrument [Line Items]    
2015 300  
2016 0  
2017 500  
2018 0  
2019 0  
Thereafter [4] 1,984  
Total 2,784  
Long-term debt to financing trusts 184 184
Baltimore Gas and Electric Company [Member]    
Debt Instrument [Line Items]    
2015 378  
2016 42  
2017 0  
2018 0  
2019 0  
Thereafter [5] 1,708  
Total 2,128  
Long-term debt to financing trusts $ 252 252
Baltimore Gas and Electric Company [Member] | BGE Trust Member [Member]    
Debt Instrument [Line Items]    
Long-term debt to financing trusts   $ 252
[1] Includes $648 million due to ComEd, PECO and BGE financing trusts.
[2] Amounts owed to these financing trusts are recorded as Long-term debt to financing trusts within Exelon’s Consolidated Balance Sheets.
[3] Includes $206 million due to ComEd financing trust.
[4] Includes $184 million due to PECO financing trusts.
[5] ncludes $258 million due to BGE financing trust.