XML 335 R210.htm IDEA: XBRL DOCUMENT v3.8.0.1
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, 2017
Dec. 31, 2016
Jun. 30, 2014
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 33,657 $ 33,311  
Unamortized debt discount and premium, net (57) (68)  
Unamortized Debt Issuance Expense [1] (201) (200)  
Long-term debt 32,176 31,575  
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 11,868  
contract Payments Junior Subordinate Debt [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 0 19  
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%    
Maximum [Member] | contract Payments Junior Subordinate Debt [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 2.50%    
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 7,608  
Unamortized debt discount and premium, net (8) (8)  
Unamortized Debt Issuance Expense (49) (57)  
Fair value adjustment of consolidated subsidiary 179 220  
Long-term debt due within one year 0 (570)  
Long-term debt 7,161 7,193  
Exelon Corporate [Member] | Junior Subordinated Debt [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 1,150 1,150  
Debt Instrument, Interest Rate, Stated Percentage 3.50%    
Exelon Corporate [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Unsecured Long Term Debt [2] $ 5,889 6,439  
Exelon Corporate [Member] | contract Payments Junior Subordinate Debt [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 0 $ 19  
Debt Instrument, Interest Rate, Stated Percentage 2.50%    
Exelon Corporate [Member] | Maximum [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage [2] 7.60%    
Exelon Corporate [Member] | Minimum [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage [2] 2.45%    
[1] Amounts owed to these financing trusts are recorded as Long-term debt to financing trusts within Exelon’s Consolidated Balance Sheets.
[2] Senior unsecured notes include mirror debt that is held on both Generation and Exelon Corporation's balance sheets.