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Mergers, Acquisitions, and Dispositions - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended 17 Months Ended
Jan. 21, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Sep. 30, 2015
Aug. 18, 2014
Jul. 18, 2014
Mar. 31, 2014
Jun. 05, 2013
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Payments to Acquire Businesses, Gross       $ 28.0 $ 67.0            
Business Combination, Integration Related Costs   $ 21.0 $ 32.0 47.0 57.0   $ 110.0        
Business Acquisition, Transaction Costs   $ 226.0   $ 226.0     $ 226.0        
Temporary Equity, Share Subscriptions   57.5   57.5     57.5        
Line of Credit Facility, Maximum Borrowing Capacity [1]   $ 8,500.0   $ 8,500.0     $ 8,500.0        
Other noncurrent assets   1,499.0   1,499.0   $ 1,160.0 1,499.0        
Proceeds from Issuance of Common Stock   1,870.0   1,868.0              
Cost of Reimbursable Expense       40.0              
Long-term Debt, Excluding Current Maturities   24,541.0   24,541.0   19,362.0 24,541.0        
Net present value of settlement amount       430.0              
Payments of Merger Related Costs, Financing Activities             116.0        
Junior Subordinated Notes, Noncurrent                     $ 1,150.0
Forward Contract Indexed to Issuer's Equity, Indexed Shares                     23.0
Charitable Contributions [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Combination Proposed Customer Benefits Package   50.0   50.0     50.0        
New Jersey Board Of Public Utilities [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Acquisition, Preacquisition Contingency, Amount of Settlement   62.0   62.0     62.0        
New Jersey Board Of Public Utilities [Member] | Energy Efficiency Program [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Acquisition, Preacquisition Contingency, Amount of Settlement   15.0   15.0     15.0        
Delaware Public Service Commission [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Acquisition, Preacquisition Contingency, Amount of Settlement   40.0   40.0     40.0        
Delaware Public Service Commission [Member] | Workforce Development [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Acquisition, Preacquisition Contingency, Amount of Settlement   2.0   2.0     2.0        
Delaware Public Service Commission [Member] | Energy Efficiency Program [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Acquisition, Preacquisition Contingency, Amount of Settlement   2.0   2.0     2.0        
District of Columbia Public Service Commission [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Acquisition, Preacquisition Contingency, Amount of Settlement   78.0   78.0     78.0        
District of Columbia Public Service Commission [Member] | Workforce Development [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Acquisition, Preacquisition Contingency, Amount of Settlement   5.0   5.0     5.0        
District of Columbia Public Service Commission [Member] | Rate Bill Credits [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Acquisition, Preacquisition Contingency, Amount of Settlement   26.0   26.0     26.0        
District of Columbia Public Service Commission [Member] | Charitable Contributions [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Acquisition, Preacquisition Contingency, Amount of Settlement   19.0   19.0     19.0        
District of Columbia Public Service Commission [Member] | OneTimeBillCredit [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Acquisition, Preacquisition Contingency, Amount of Settlement   14.0   14.0     14.0        
District of Columbia Public Service Commission [Member] | LowIncomeAssistance [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Acquisition, Preacquisition Contingency, Amount of Settlement   16.0   16.0     16.0        
Maryland Public Service Commission [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Acquisition, Preacquisition Contingency, Amount of Settlement   66.0   66.0     66.0        
Maryland Public Service Commission [Member] | Energy Efficiency Program [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Acquisition, Preacquisition Contingency, Amount of Settlement   43.2   43.2     43.2        
Maryland Public Service Commission [Member] | Green Sustainability Fund [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Acquisition, Preacquisition Contingency, Amount of Settlement   14.4   14.4     14.4        
Pepco Holdings [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Payments to Acquire Businesses, Gross       6,900.0              
Cash offered in exchange for each share of PHI stock                 $ 27.25    
Cost of Reimbursable Expense       5,400.0              
Pepco Holdings [Member] | Minimum [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Exit Costs           259.0          
Pepco Holdings [Member] | Maximum [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Exit Costs           293.0          
Other Long-term Investments                 $ 180.0    
Exelon Generation Co L L C [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Payments to Acquire Businesses, Gross       28.0 67.0            
Business Combination, Integration Related Costs   9.0 3.0 24.0 4.0            
Equity Method Investment, Ownership Percentage               67.00%   50.01%  
Gain on Sale of Investments     329.0                
Equity Method Investment, Net Sales Proceeds     615.0                
Other noncurrent assets   881.0   881.0   731.0 881.0        
Long-term Debt, Excluding Current Maturities   7,964.0   7,964.0   6,709.0 7,964.0        
Proceeds from Sale of Productive Assets $ 1,800.0                    
Baltimore Gas and Electric Company [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Combination, Integration Related Costs   2.0 1.0 5.0 1.0            
Other noncurrent assets   25.0   25.0   25.0 25.0        
Long-term Debt, Excluding Current Maturities   1,828.0   1,828.0   1,867.0 1,828.0        
Gain (Loss) on Disposition of Assets   1.0   1.0              
Commonwealth Edison Co [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Combination, Integration Related Costs   3.0 1.0 10.0 1.0            
Other noncurrent assets   295.0   295.0   277.0 295.0        
Long-term Debt, Excluding Current Maturities   5,435.0   5,435.0   5,698.0 5,435.0        
PECO Energy Co [Member]                      
Payments to Acquire Businesses and Interest in Affiliates [Abstract]                      
Business Combination, Integration Related Costs   2.0 1.0 4.0 $ 1.0            
Other noncurrent assets   36.0   36.0   34.0 36.0        
Long-term Debt, Excluding Current Maturities   2,246.0   2,246.0   $ 2,246.0 $ 2,246.0        
Gain (Loss) on Disposition of Assets   $ 0.0 $ 0.0 $ 1.0              
[1] Excludes additional credit facility agreements for Generation, ComEd, PECO and BGE with aggregate commitments of $50 million, $34 million, $34 million and $5 million, respectively, arranged with minority and community banks located primarily within ComEd’s, PECO’s and BGE’s service territories. These facilities expired on October 16, 2015 and were renewed at the same amount through October 14, 2016. These facilities are solely utilized to issue letters of credit. As of September 30, 2015, letters of credit issued under these agreements for Generation, ComEd, PECO and BGE totaled $7 million, $16 million, $21 million and $1 million, respectively.