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Income Taxes - Reconciliation to Effective Tax Rate (Details)
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Mar. 23, 2016
Jun. 30, 2017
Jun. 30, 2016
Effective Income Tax Rate Reconciliation, Percent [Abstract]            
U.S. Federal statutory rate   35.00% [1] 35.00%   35.00% 35.00%
Increase (decrease) due to:            
State income taxes, net of Federal income tax benefit   (2745.70%) [1] 2.30%   (1.00%) 0.80%
Qualified nuclear decommissioning trust fund income   3156.60% [1] 5.70%   5.60% 5.60%
Amortization of investment tax credit, including deferred taxes on basis difference   (528.70%) [1] (1.80%)   (0.70%) (1.70%)
Plant basis differences   (2764.40%) [1] (6.90%)   (4.30%) (6.30%)
Production tax credits and other credits   (1035.70%) [1] (5.80%)   (1.40%) (5.50%)
Noncontrolling interests   84.70% [1] 0.90%   (0.10%) 0.70%
Statute of limitations expiration     (1.70%)     (1.00%)
Merger expenses     0.20%   (11.40%) 14.50%
Fitzpatrick bargain purchase gain         (6.50%)  
Like-kind exchange(c)   (5362.40%) [2]     (3.70%)  
Other   1960.60% [1] (3.30%)   0.30% (2.80%)
Effective income tax rate   (7200.00%) [1] 24.60%   11.80% 39.30%
Exelon Generation Co L L C [Member]            
Effective Income Tax Rate Reconciliation, Percent [Abstract]            
U.S. Federal statutory rate   35.00% [3] 35.00%   35.00% 35.00%
Increase (decrease) due to:            
State income taxes, net of Federal income tax benefit   5.60% [3] (116.70%)   (13.60%) 2.60%
Qualified nuclear decommissioning trust fund income   (6.30%) [3] 591.20%   51.20% 9.80%
Amortization of investment tax credit, including deferred taxes on basis difference   0.90% [3] (157.80%)   (5.40%) (2.50%)
Plant basis differences   0.00% [3] 0.00%   0.00% 0.00%
Production tax credits and other credits   2.00% [3] (603.00%)   (12.30%) (9.60%)
Noncontrolling interests   (0.20%) [3] 94.40%   (0.50%) 1.20%
Statute of limitations expiration     (410.80%)     (3.90%)
Merger expenses     0.00%   (13.70%) 0.00%
Fitzpatrick bargain purchase gain         (60.00%)  
Like-kind exchange(c)   0.00% [3]     0.00%  
Other   1.10% [3] (52.30%)   (4.20%) (3.80%)
Effective income tax rate   38.10% [3] (620.00%) [4]   (23.50%) 28.80%
Commonwealth Edison Co [Member]            
Effective Income Tax Rate Reconciliation, Percent [Abstract]            
U.S. Federal statutory rate   35.00% 35.00%   35.00% 35.00%
Increase (decrease) due to:            
State income taxes, net of Federal income tax benefit   5.80% 4.80%   5.30% 4.90%
Qualified nuclear decommissioning trust fund income   (0.00%) (0.00%)   (0.00%) (0.00%)
Amortization of investment tax credit, including deferred taxes on basis difference   (0.20%) (0.20%)   (0.20%) (0.20%)
Plant basis differences   (0.20%) (0.40%)   (0.20%) (0.30%)
Production tax credits and other credits   0.00% 0.00%   0.00% 0.00%
Noncontrolling interests   0.00% 0.00%   0.00% 0.00%
Statute of limitations expiration     0.00%      
Merger expenses     0.00%   0.00% 0.00%
Fitzpatrick bargain purchase gain         0.00%  
Like-kind exchange(c)   5.90%     2.90%  
Other   0.50% (0.60%)   0.40% (0.10%)
Effective income tax rate   46.80% 38.60%   43.20% 39.30%
PECO Energy Co [Member]            
Effective Income Tax Rate Reconciliation, Percent [Abstract]            
U.S. Federal statutory rate   35.00% 35.00%   35.00% 35.00%
Increase (decrease) due to:            
State income taxes, net of Federal income tax benefit   (0.60%) 0.30%   (0.10%) 0.70%
Qualified nuclear decommissioning trust fund income   (0.00%) (0.00%)   (0.00%) (0.00%)
Amortization of investment tax credit, including deferred taxes on basis difference   (0.10%) (0.10%)   (0.10%) (0.10%)
Plant basis differences   (16.00%) (11.30%)   (14.30%) (10.20%)
Production tax credits and other credits   0.00% 0.00%   0.00% 0.00%
Noncontrolling interests   0.00% 0.00%   0.00% 0.00%
Statute of limitations expiration     0.00%      
Merger expenses     0.00%   0.00% 0.00%
Fitzpatrick bargain purchase gain         0.00%  
Like-kind exchange(c)   0.00%     0.00%  
Other   0.20% (5.20%) [5]   (0.10%) (2.40%) [5]
Effective income tax rate   18.50% 18.70%   20.40% 23.00%
Baltimore Gas and Electric Company [Member]            
Effective Income Tax Rate Reconciliation, Percent [Abstract]            
U.S. Federal statutory rate   35.00% 35.00%   35.00% 35.00%
Increase (decrease) due to:            
State income taxes, net of Federal income tax benefit   5.00% 2.00%   5.10% 4.60%
Qualified nuclear decommissioning trust fund income   (0.00%) (0.00%)   (0.00%) (0.00%)
Amortization of investment tax credit, including deferred taxes on basis difference   (0.20%) (0.40%)   (0.10%) (0.10%)
Plant basis differences   (0.30%) (20.60%) [6]   (0.70%) (4.50%)
Production tax credits and other credits   0.00% 0.00%   0.00% 0.00%
Noncontrolling interests   0.00% 0.00%   0.00% 0.00%
Statute of limitations expiration     0.00%      
Merger expenses     0.00%   0.00% 0.00%
Fitzpatrick bargain purchase gain         0.00%  
Like-kind exchange(c)   0.00%     0.00%  
Other   1.30% (1.00%)   0.30% 0.10%
Effective income tax rate   40.80% 15.00% [7]   39.60% 35.10%
Potomac Electric Power Company [Member]            
Effective Income Tax Rate Reconciliation, Percent [Abstract]            
U.S. Federal statutory rate   35.00% 35.00%   35.00% 35.00% [8]
Increase (decrease) due to:            
State income taxes, net of Federal income tax benefit   3.20% 3.50%   3.80% (9.50%) [9]
Qualified nuclear decommissioning trust fund income   (0.00%) (0.00%)   (0.00%) (0.00%) [8]
Amortization of investment tax credit, including deferred taxes on basis difference   (0.10%) (0.10%)   (0.10%) 0.10%
Plant basis differences   (6.20%) (5.70%)   (6.00%) 12.60% [8]
Production tax credits and other credits   0.00% 0.00%   0.00% 0.00% [8]
Noncontrolling interests   0.00% 0.00%   0.00% 0.00% [8]
Statute of limitations expiration [8]     0.00%      
Merger expenses     0.20%   (16.20%) (36.10%) [8]
Fitzpatrick bargain purchase gain         0.00%  
Like-kind exchange(c)   0.00%     0.00%  
Other   (0.20%) (1.00%)   (0.70%) (0.50%) [8]
Effective income tax rate   31.70% 31.90%   15.80% 1.60% [8]
Delmarva Power and Light Company [Member]            
Effective Income Tax Rate Reconciliation, Percent [Abstract]            
U.S. Federal statutory rate   35.00% 35.00%   35.00% 35.00% [8]
Increase (decrease) due to:            
State income taxes, net of Federal income tax benefit   4.60% 4.80%   5.10% (5.20%) [9]
Qualified nuclear decommissioning trust fund income   (0.00%) (0.00%)   (0.00%) (0.00%) [8]
Amortization of investment tax credit, including deferred taxes on basis difference   (0.10%) [8] (0.60%)   (0.20%) 0.40% [8]
Plant basis differences   (1.70%) (3.50%)   (1.80%) 2.00% [8]
Production tax credits and other credits   0.00% 0.00%   0.00% 0.00%
Noncontrolling interests   0.00% 0.00%   0.00% 0.00% [8]
Statute of limitations expiration [8]     0.00%      
Merger expenses     3.10%   (15.10%) (30.50%) [8]
Fitzpatrick bargain purchase gain         0.00%  
Like-kind exchange(c)   0.00%     0.00%  
Other   0.90% 1.20%   1.00% (0.10%) [8]
Effective income tax rate   38.70% 40.00%   24.00% 1.60% [8]
Atlantic City Electric Company [Member]            
Effective Income Tax Rate Reconciliation, Percent [Abstract]            
U.S. Federal statutory rate   35.00% 35.00%   35.00% 35.00% [8]
Increase (decrease) due to:            
State income taxes, net of Federal income tax benefit   5.60% 5.90%   5.60% 5.90% [8]
Qualified nuclear decommissioning trust fund income   (0.00%) (0.00%)   (0.00%) (0.00%) [8]
Amortization of investment tax credit, including deferred taxes on basis difference   (0.40%) (1.60%)   (0.40%) 0.10% [8]
Plant basis differences   (3.30%) (7.10%)   (3.30%) 1.00% [8]
Production tax credits and other credits   0.00% 0.00%   0.00% 0.00%
Noncontrolling interests   0.00% 0.00%   0.00% 0.00% [8]
Statute of limitations expiration [8]     0.00%      
Merger expenses     0.00%   (85.30%) (17.70%) [8]
Fitzpatrick bargain purchase gain         0.00%  
Like-kind exchange(c)   0.00%     0.00%  
Other   (3.60%) 7.80%   (1.60%) (0.10%) [8]
Effective income tax rate   33.30% 40.00%   (50.00%) 24.20% [8]
Pepco Holdings LLC [Member] | Successor [Member]            
Effective Income Tax Rate Reconciliation, Percent [Abstract]            
U.S. Federal statutory rate 35.00% [8] 35.00% 35.00%   35.00%  
Increase (decrease) due to:            
State income taxes, net of Federal income tax benefit 5.20% [8] 4.30% 6.10%   4.60%  
Qualified nuclear decommissioning trust fund income (0.00%) [8] (0.00%) (0.00%)   (0.00%)  
Amortization of investment tax credit, including deferred taxes on basis difference 0.10% [8] (0.10%) (0.30%)   (0.20%)  
Plant basis differences 1.70% [8] (4.80%) (7.00%)   (4.30%)  
Production tax credits and other credits 0.00% 0.00% 0.00%   0.00%  
Noncontrolling interests 0.00% [8] 0.00% 0.00%   0.00%  
Statute of limitations expiration 0.00% [8]   0.00%      
Merger expenses (18.90%) [8]   1.00%   (23.80%)  
Fitzpatrick bargain purchase gain         0.00%  
Like-kind exchange(c)   0.00%     0.00%  
Other (0.00%) [8] 0.90% 1.00%   (0.00%)  
Effective income tax rate 23.10% [8] 35.30% 35.80%   11.30%  
Pepco Holdings LLC [Member] | Predecessor [Member]            
Effective Income Tax Rate Reconciliation, Percent [Abstract]            
U.S. Federal statutory rate       35.00%    
Increase (decrease) due to:            
State income taxes, net of Federal income tax benefit       11.90%    
Qualified nuclear decommissioning trust fund income       (0.00%)    
Amortization of investment tax credit, including deferred taxes on basis difference       (0.90%)    
Plant basis differences       (13.50%)    
Production tax credits and other credits       0.00%    
Noncontrolling interests       0.00%    
Statute of limitations expiration       0.00%    
Merger expenses       11.10%    
Other       3.60%    
Effective income tax rate       47.20%    
[1] The effective tax rate for the three months ended June 30, 2017 is disproportionately impacted due to the decline in consolidated pre-tax GAAP earnings as compared to the federal and state tax impacts of the Like-kind exchange, tax credits, Plant basis differences, and Qualified nuclear decommissioning trust fund income.
[2] See Like-Kind Exchange within the Other Income Tax Matters section below for further details.
[3] Generation recognized a loss before income taxes for the three months ended June 30, 2017. As a result, positive percentages represent an income tax benefit for the period presented.
[4] The effective tax rate for the three months ended June 30, 2016, is disproportionately impacted due to the decline in pre-tax GAAP earnings as compared to the changes in tax credits and other reconciling items. In three months ended June 30, 2016, due to the expiration of a statute of limitations, Generation recorded an income tax benefit of $16 million. The statute of limitations expired in the third quarter of 2015; therefore, this represents an out of period adjustment.
[5] At PECO, includes a cumulative adjustment related to an anticipated gas repairs tax return accounting method change.
[6] At BGE, includes a cumulative adjustment related to a regulatory asset.
[7] The effective tax rate for the three months ended June 30, 2016 is disproportionately impacted due to the decline in pre-tax GAAP earnings and changes in other reconciling items.
[8] Pepco, DPL and ACE recognized a loss before income taxes for the six months ended June 30, 2016, and PHI recognized a loss before income taxes for the period of March 24, 2016, through June 30, 2016. As a result, positive percentages represent an income tax benefit for the periods presented.
[9] Includes a remeasurement of uncertain state income tax positions for Pepco and DPL.