XML 256 R129.htm IDEA: XBRL DOCUMENT v3.6.0.2
Income Taxes - Reconciliation to Effective Tax Rate (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 23, 2016
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Line Items]          
U.S. Federal statutory rate     35.00% 35.00% 35.00%
State income taxes, net of Federal income tax benefit (b)     3.30% [1] 3.70% 1.30%
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent     3.40% (0.40%) 2.40%
Domestic production activities deduction     (0.00%) (0.70%) (2.00%)
Effective Income Tax Rate Reconciliation, Deduction, Medicare Prescription Drug Benefit, Percent     0.00% 0.00% 0.10%
Amortization of investment tax credit, including deferred taxes on basis difference     (1.20%) (0.90%) (1.10%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent     (4.80%) (1.50%) (1.90%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent     (3.60%) (1.90%) (2.40%)
Noncontrolling interests     (0.20%) (0.30%) (1.80%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent     (0.40%) (1.40%) (2.60%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Percent     1.90%    
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent     5.50%    
Other (c)     (0.60%) 0.00% (0.20%)
Effective income tax rate     38.30% 32.20% 26.80%
Exelon Generation Co L L C [Member]          
Income Taxes [Line Items]          
U.S. Federal statutory rate     35.00% 35.00% 35.00%
State income taxes, net of Federal income tax benefit (b)     3.30% 1.00% (1.90%)
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent     7.80% (0.80%) 4.80%
Domestic production activities deduction     (0.00%) (1.30%) (4.10%)
Effective Income Tax Rate Reconciliation, Deduction, Medicare Prescription Drug Benefit, Percent     0.00% 0.00% 0.00%
Amortization of investment tax credit, including deferred taxes on basis difference     (2.30%) (1.50%) (2.00%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent     (0.00%) (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent     (8.20%) (3.40%) (4.80%)
Noncontrolling interests     (0.30%) (0.50%) (3.70%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent     (1.70%) (2.40%) (5.30%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Percent     (0.00%)    
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent     1.10%    
Other (c)     (1.50%) 0.00% (1.10%)
Effective income tax rate     33.20% 27.10% 16.90%
Commonwealth Edison Co [Member]          
Income Taxes [Line Items]          
U.S. Federal statutory rate     35.00% 35.00% 35.00%
State income taxes, net of Federal income tax benefit (b)     5.60% 4.90% 4.50%
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent     0.00% 0.00% 0.00%
Domestic production activities deduction     (0.00%) (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Deduction, Medicare Prescription Drug Benefit, Percent     0.00% 0.00% 0.20%
Amortization of investment tax credit, including deferred taxes on basis difference     (0.30%) (0.30%) (0.30%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent     (0.60%) (0.10%) (0.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent     (0.00%) (0.00%) (0.00%)
Noncontrolling interests     (0.00%) (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent     (0.00%) (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Percent     4.50%    
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent     0.00%    
Other (c)     0.10% 0.20% 0.30%
Effective income tax rate     44.30% 39.70% 39.60%
PECO Energy Co [Member]          
Income Taxes [Line Items]          
U.S. Federal statutory rate     35.00% 35.00% 35.00%
State income taxes, net of Federal income tax benefit (b)     1.30% 1.00% (0.10%)
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent     0.00% 0.00% 0.00%
Domestic production activities deduction     (0.00%) (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Deduction, Medicare Prescription Drug Benefit, Percent     0.00% 0.00% 0.00%
Amortization of investment tax credit, including deferred taxes on basis difference     (0.10%) (0.10%) (0.10%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent     (9.60%) (8.70%) (10.40%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent     (0.00%) (0.00%) (0.00%)
Noncontrolling interests     (0.00%) (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent     (0.00%) (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Percent     (0.00%)    
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent     0.00%    
Other (c)     (1.20%) [2] 0.20% 0.10%
Effective income tax rate     25.40% 27.40% 24.50%
Baltimore Gas and Electric Company [Member]          
Income Taxes [Line Items]          
U.S. Federal statutory rate     35.00% 35.00% 35.00%
State income taxes, net of Federal income tax benefit (b)     5.00% 5.30% 5.00%
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent     0.00% 0.00% 0.00%
Domestic production activities deduction     (0.00%) (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Deduction, Medicare Prescription Drug Benefit, Percent     0.00% 0.10% 0.20%
Amortization of investment tax credit, including deferred taxes on basis difference     (0.10%) (0.10%) (0.30%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent     (2.70%) (0.70%) 0.20%
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent     (0.00%) (0.00%) (0.00%)
Noncontrolling interests     (0.00%) (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent     (0.00%) (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Percent     (0.00%)    
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent     0.00%    
Other (c)     0.00% 0.00% (0.20%)
Effective income tax rate     37.20% 39.60% 39.90%
Potomac Electric Power Company [Member]          
Income Taxes [Line Items]          
U.S. Federal statutory rate     35.00% 35.00% 35.00%
State income taxes, net of Federal income tax benefit (b)     15.70% [1] 6.70% 5.40%
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent     0.00% 0.00% 0.00%
Domestic production activities deduction     (0.00%) (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Deduction, Medicare Prescription Drug Benefit, Percent     0.00% 0.00% 0.00%
Amortization of investment tax credit, including deferred taxes on basis difference     (0.20%) (0.10%) (0.10%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent     (22.80%) (5.80%) (4.90%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent     (0.00%) (0.00%) (0.00%)
Noncontrolling interests     (0.00%) (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent     (0.00%) (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Percent     (0.00%)    
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent     23.50%    
Other (c)     (1.80%) (0.50%) [3] (0.20%)
Effective income tax rate     49.40% 35.30% 35.20%
Delmarva Power and Light Company [Member]          
Income Taxes [Line Items]          
U.S. Federal statutory rate     35.00% [4] 35.00% 35.00%
State income taxes, net of Federal income tax benefit (b)     52.70% [1],[4] 1.70% 4.80%
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent     0.00% [4] 0.00% 0.00%
Domestic production activities deduction     (0.00%) [4] (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Deduction, Medicare Prescription Drug Benefit, Percent     0.00% [4] 0.00% 0.00%
Amortization of investment tax credit, including deferred taxes on basis difference     (3.70%) [4] (0.40%) (0.30%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent     (25.50%) [4] (2.30%) (2.40%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent     (0.00%) [4] (0.00%) (0.00%)
Noncontrolling interests     (0.00%) [4] (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent     (0.00%) [4] (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Percent [4]     (0.00%)    
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent [4]     112.90%    
Other (c)     (2.20%) [4] 5.20% [3] 1.40%
Effective income tax rate     169.20% [4] 39.20% 38.50%
Atlantic City Electric Company [Member]          
Income Taxes [Line Items]          
U.S. Federal statutory rate     35.00% [4] 35.00% 35.00%
State income taxes, net of Federal income tax benefit (b)     6.20% [4] 5.70% 5.80%
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent     0.00% [4] 0.00% 0.00%
Domestic production activities deduction     (0.00%) [4] (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Deduction, Medicare Prescription Drug Benefit, Percent     0.00% [4] 0.00% 0.00%
Amortization of investment tax credit, including deferred taxes on basis difference     0.80% [4] (0.60%) (0.60%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent     10.30% [4] (1.30%) (0.50%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent     (0.00%) [4] (0.00%) (0.00%)
Noncontrolling interests     (0.00%) [4] (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent     (0.00%) [4] (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Percent [4]     (0.00%)    
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent [4]     (44.90%)    
Other (c)     1.30% [4] 6.40% [3] (0.20%)
Effective income tax rate     8.70% [4] 45.20% 39.50%
Pepco Holdings LLC [Member] | Successor [Member]          
Income Taxes [Line Items]          
U.S. Federal statutory rate [4]     35.00%    
State income taxes, net of Federal income tax benefit (b) [1],[4]   5.80%      
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent [4]   0.00%      
Domestic production activities deduction [4]   (0.00%)      
Effective Income Tax Rate Reconciliation, Deduction, Medicare Prescription Drug Benefit, Percent [4]   0.00%      
Amortization of investment tax credit, including deferred taxes on basis difference [4]   1.40%      
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent [4]   39.00%      
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent [4]   (0.00%)      
Noncontrolling interests [4]   (0.00%)      
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent [4]   (0.00%)      
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Percent [4]   (0.70%)      
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent [4]   (89.00%)      
Other (c) [4]   3.30%      
Effective income tax rate [4]   (5.20%)      
Pepco Holdings LLC [Member] | Predecessor [Member]          
Income Taxes [Line Items]          
U.S. Federal statutory rate     35.00% [4] 35.00% 35.00%
State income taxes, net of Federal income tax benefit (b) 11.90% [1],[4]     6.60% 5.30%
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent 0.00% [4]     0.00% 0.00%
Domestic production activities deduction (0.00%) [4]     (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Deduction, Medicare Prescription Drug Benefit, Percent 0.00% [4]     0.00% 0.00%
Amortization of investment tax credit, including deferred taxes on basis difference (0.90%) [4]     (0.20%) (0.30%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent (13.50%) [4]     (4.30%) (4.50%)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent (0.00%) [4]     (0.00%) (0.00%)
Noncontrolling interests (0.00%) [4]     (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent (0.00%) [4]     (0.00%) (0.00%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Percent [4] (0.00%)        
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent [4] 11.10%        
Other (c) 3.60% [4]     (3.20%) [3] 0.80%
Effective income tax rate 47.20% [4]     33.90% 36.30%
[1] Includes a remeasurement of uncertain state income tax positions for Pepco and DPL.
[2] At PECO, includes a cumulative adjustment related to an anticipated gas repairs tax return accounting method change.
[3] Includes impacts of the PHI Global Settlement for Pepco, DPL, ACE, and PHI
[4] DPL and ACE recognized a loss before income taxes for the year ended December 31, 2016, and PHI recognized a loss before income taxes for the period of March 24, 2016, through December 31, 2016. As a result, positive percentages represent an income tax benefit for the periods presented.