XML 325 R207.htm IDEA: XBRL DOCUMENT v3.10.0.1
Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Debt and Credit Agreements - Schedule of Outstanding Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2014
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 34,911 $ 33,657  
Unamortized debt discount and premium, net (66) (57)  
Unamortized debt issuance costs 216 201  
Long-term debt 34,075 32,176  
Junior Subordinated Debt [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross 1,150 $ 1,150  
Debt Instrument, Interest Rate, Stated Percentage   3.497% 2.50%
Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 11,285 $ 11,285  
Maximum [Member] | Junior Subordinated Debt [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.50%    
Maximum [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 7.60%    
Minimum [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 2.45%    
Exelon Corporate [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 7,039 7,039  
Unamortized debt discount and premium, net (7) (8)  
Unamortized debt issuance costs (47) (49)  
Fair value adjustment of consolidated subsidiary 162 179  
Long-term debt 7,147 7,161  
Exelon Corporate [Member] | Junior Subordinated Debt [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross 1,150 1,150  
Exelon Corporate [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross [1] $ 5,889 $ 5,889  
Exelon Corporate [Member] | Maximum [Member] | Junior Subordinated Debt [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.50%    
Exelon Corporate [Member] | Maximum [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage [1] 7.60%    
Exelon Corporate [Member] | Minimum [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage [1] 2.45%    
[1] Senior unsecured notes include mirror debt that is held on both Generation and Exelon Corporation's balance sheets.