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Supplemental Financial Information - Summary of Other Income (Expense) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 23, 2016
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplemental Financial Information Tables [Line Items]          
Net realized income on decommissioning trust funds - Regulatory Agreement Units [1]     $ 488 $ 237 $ 232
Net realized income on decommissioning trust funds - Non-Regulatory Agreement Units [1]     209 126 156
Net unrealized income (losses) on decommissioning trust funds - Regulatory Agreement Units     455 216 (282)
Net unrealized income (losses) on decommissioning trust funds - Non-Regulatory Agreement     521 194 (197)
Net unrealized income (losses) on pledged assets     (10) (1) 7
Regulatory offset to decommissioning trust fund-related activities [2]     (724) (372) 21
Total decommissioning-related activities     939 400 (63)
Investment income (loss)     8 17 8
Long-term lease income       4 15
Interest income related to uncertain income tax positions     3 13 1
Income Tax Examination, Penalties and Interest Expense     2 (106) [3]  
AFUDC—Equity     73 64 24
Terminated interest rate swaps(d) [4]       (3) (26)
Payments of Debt Restructuring Costs [5]         (22)
Gain (Loss) on Disposition of Assets     3 (48) 18
Other     31 24 17
Other, net     1,056 413 (46)
Reclassification out of Accumulated Other Comprehensive Income [Member]          
Supplemental Financial Information Tables [Line Items]          
Other, net [6]       (5)  
Gain (Loss) on Sale of Derivatives     26    
Exelon Generation Co L L C [Member]          
Supplemental Financial Information Tables [Line Items]          
Net realized income on decommissioning trust funds - Regulatory Agreement Units [1]     488 237 232
Net realized income on decommissioning trust funds - Non-Regulatory Agreement Units [1]     209 126 156
Net unrealized income (losses) on decommissioning trust funds - Regulatory Agreement Units     455 216 (282)
Net unrealized income (losses) on decommissioning trust funds - Non-Regulatory Agreement     521 194 (197)
Net unrealized income (losses) on pledged assets     (10) (1) 7
Regulatory offset to decommissioning trust fund-related activities [2]     (724) (372) 21
Total decommissioning-related activities     939 400 (63)
Investment income (loss)     6 8 3
Long-term lease income       0 0
Interest income related to uncertain income tax positions     (1) 0 1
Income Tax Examination, Penalties and Interest Expense     0 0 [3]  
AFUDC—Equity     0 0 0
Terminated interest rate swaps(d)       (2) 0
Payments of Debt Restructuring Costs         0
Gain (Loss) on Disposition of Assets     2 (59) 12
Other     4 (5) (1)
Other, net     948 401 (60)
Exelon Generation Co L L C [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]          
Supplemental Financial Information Tables [Line Items]          
Other, net [6]       (5)  
Exelon Generation Co L L C [Member] | Senior Notes [Member]          
Supplemental Financial Information Tables [Line Items]          
Debt Instrument, Face Amount     750    
Commonwealth Edison Co [Member]          
Supplemental Financial Information Tables [Line Items]          
Net realized income on decommissioning trust funds - Regulatory Agreement Units [1]     0 0 0
Net realized income on decommissioning trust funds - Non-Regulatory Agreement Units [1]     0 0 0
Net unrealized income (losses) on decommissioning trust funds - Regulatory Agreement Units     0 0 0
Net unrealized income (losses) on decommissioning trust funds - Non-Regulatory Agreement     0 0 0
Net unrealized income (losses) on pledged assets     0 0 0
Regulatory offset to decommissioning trust fund-related activities [2]     0 0 0
Total decommissioning-related activities     0 0 0
Investment income (loss)     0 0 0
Long-term lease income       0 0
Interest income related to uncertain income tax positions     0 0 0
Income Tax Examination, Penalties and Interest Expense     0 (86) [3]  
AFUDC—Equity     12 14 5
Terminated interest rate swaps(d)       0 0
Payments of Debt Restructuring Costs         0
Other     10 7 16
Other, net     22 (65) 21
PECO Energy Co [Member]          
Supplemental Financial Information Tables [Line Items]          
Net realized income on decommissioning trust funds - Regulatory Agreement Units [1]     0 0 0
Net realized income on decommissioning trust funds - Non-Regulatory Agreement Units [1]     0 0 0
Net unrealized income (losses) on decommissioning trust funds - Regulatory Agreement Units     0 0 0
Net unrealized income (losses) on decommissioning trust funds - Non-Regulatory Agreement     0 0 0
Net unrealized income (losses) on pledged assets     0 0 0
Regulatory offset to decommissioning trust fund-related activities     0 [2] 0 [2] 0
Total decommissioning-related activities     0 0 0
Investment income (loss)     0 (1) (2)
Long-term lease income       0 0
Interest income related to uncertain income tax positions     0 0 0
Income Tax Examination, Penalties and Interest Expense     0 0  
AFUDC—Equity     9 8 5
Terminated interest rate swaps(d)       0 0
Payments of Debt Restructuring Costs         0
Other     0 1 2
Other, net     9 8 5
Baltimore Gas and Electric Company [Member]          
Supplemental Financial Information Tables [Line Items]          
Net realized income on decommissioning trust funds - Regulatory Agreement Units [1]     0 0 0
Net realized income on decommissioning trust funds - Non-Regulatory Agreement Units [1]     0 0 0
Net unrealized income (losses) on decommissioning trust funds - Regulatory Agreement Units     0 0 0
Net unrealized income (losses) on decommissioning trust funds - Non-Regulatory Agreement     0 0 0
Net unrealized income (losses) on pledged assets     0 0 0
Regulatory offset to decommissioning trust fund-related activities [2]     0 0 0
Total decommissioning-related activities     0 0 0
Investment income (loss)     0 2 4
Long-term lease income       0 0
Interest income related to uncertain income tax positions     0 0 0
Income Tax Examination, Penalties and Interest Expense     0 0  
AFUDC—Equity     16 19 14
Terminated interest rate swaps(d)       0 0
Payments of Debt Restructuring Costs         0
Other     0 0 0
Other, net     16 21 18
Pepco Holdings LLC [Member]          
Supplemental Financial Information Tables [Line Items]          
Total decommissioning-related activities     0    
Pepco Holdings LLC [Member] | Successor [Member]          
Supplemental Financial Information Tables [Line Items]          
Net realized income on decommissioning trust funds - Regulatory Agreement Units [1]   $ 0 0    
Net realized income on decommissioning trust funds - Non-Regulatory Agreement Units   0 0 [1]    
Net unrealized income (losses) on decommissioning trust funds - Regulatory Agreement Units   0 0    
Net unrealized income (losses) on decommissioning trust funds - Non-Regulatory Agreement   0 0    
Net unrealized income (losses) on pledged assets   0 [2] 0    
Regulatory offset to decommissioning trust fund-related activities   0 0 [2]    
Total decommissioning-related activities       0  
Investment income (loss)   1 2    
Long-term lease income   0      
Interest income related to uncertain income tax positions   (1) 0    
Income Tax Examination, Penalties and Interest Expense     0 0  
AFUDC—Equity   23 36    
Terminated interest rate swaps(d)       0  
Gain (Loss) on Disposition of Assets   (1) 1    
Other   21 16    
Other, net   $ 44 54    
Pepco Holdings LLC [Member] | Predecessor [Member]          
Supplemental Financial Information Tables [Line Items]          
Net realized income on decommissioning trust funds - Regulatory Agreement Units [1] $ 0       0
Net realized income on decommissioning trust funds - Non-Regulatory Agreement Units 0       0 [1]
Net unrealized income (losses) on decommissioning trust funds - Regulatory Agreement Units 0       0
Net unrealized income (losses) on decommissioning trust funds - Non-Regulatory Agreement 0       0
Net unrealized income (losses) on pledged assets 0 [2]       0
Regulatory offset to decommissioning trust fund-related activities 0       0 [2]
Total decommissioning-related activities       0 0
Investment income (loss) 0       0
Long-term lease income 0       0
Interest income related to uncertain income tax positions 0       34
Income Tax Examination, Penalties and Interest Expense       0  
AFUDC—Equity 7       14
Terminated interest rate swaps(d)       0 0
Payments of Debt Restructuring Costs         0
Gain (Loss) on Disposition of Assets 0       46
Other (11)       40
Other, net (4)       88
Pepco Holdings LLC [Member] | Predecessor [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]          
Supplemental Financial Information Tables [Line Items]          
Other, net [6] $ 0        
Potomac Electric Power Company [Member]          
Supplemental Financial Information Tables [Line Items]          
Net realized income on decommissioning trust funds - Regulatory Agreement Units [1]     0 0 0
Net realized income on decommissioning trust funds - Non-Regulatory Agreement Units     0 [1] 0 0 [1]
Net unrealized income (losses) on decommissioning trust funds - Regulatory Agreement Units     0 0 0
Net unrealized income (losses) on decommissioning trust funds - Non-Regulatory Agreement     0 0 0
Net unrealized income (losses) on pledged assets     0 0 [2] 0
Regulatory offset to decommissioning trust fund-related activities     0 [2] 0 0 [2]
Total decommissioning-related activities     0 0 0
Investment income (loss)     1 1 0
Long-term lease income       0 0
Interest income related to uncertain income tax positions     0 1 5
Income Tax Examination, Penalties and Interest Expense     0 0  
AFUDC—Equity     23 19 12
Terminated interest rate swaps(d)       0 0
Payments of Debt Restructuring Costs         0
Gain (Loss) on Disposition of Assets     (1) 8 46
Other     8 15 11
Other, net     32 36 28
Delmarva Power and Light Company [Member]          
Supplemental Financial Information Tables [Line Items]          
Net realized income on decommissioning trust funds - Regulatory Agreement Units [1]     0 0 0
Net realized income on decommissioning trust funds - Non-Regulatory Agreement Units     0 [1] 0 0 [1]
Net unrealized income (losses) on decommissioning trust funds - Regulatory Agreement Units     0 0 0
Net unrealized income (losses) on decommissioning trust funds - Non-Regulatory Agreement     0 0 0
Net unrealized income (losses) on pledged assets     0 0 [2] 0
Regulatory offset to decommissioning trust fund-related activities     0 [2] 0 0 [2]
Total decommissioning-related activities     0 0 0
Investment income (loss)     0 0 0
Long-term lease income       0 0
Interest income related to uncertain income tax positions     0 0 0
Income Tax Examination, Penalties and Interest Expense     0 0  
AFUDC—Equity     7 5 1
Terminated interest rate swaps(d)       0 0
Payments of Debt Restructuring Costs         0
Other     7 8 9
Other, net     14 13 10
Atlantic City Electric Company [Member]          
Supplemental Financial Information Tables [Line Items]          
Net realized income on decommissioning trust funds - Regulatory Agreement Units [1]     0 0 0
Net realized income on decommissioning trust funds - Non-Regulatory Agreement Units     0 [1] 0 0 [1]
Net unrealized income (losses) on decommissioning trust funds - Regulatory Agreement Units     0 0 0
Net unrealized income (losses) on decommissioning trust funds - Non-Regulatory Agreement     0 0 0
Net unrealized income (losses) on pledged assets     0 0 [2] 0
Regulatory offset to decommissioning trust fund-related activities     0 [2] 0 0 [2]
Total decommissioning-related activities     0 0 0
Investment income (loss)     0 1 0
Long-term lease income       0 0
Interest income related to uncertain income tax positions     0 0 0
Income Tax Examination, Penalties and Interest Expense     0 0  
AFUDC—Equity     6 6 1
Terminated interest rate swaps(d)       0 0
Payments of Debt Restructuring Costs         0
Other     1 2 2
Other, net     $ 7 $ 9 $ 3
[1] Includes investment income and realized gains and losses on sales of investments within the nuclear decommissioning trust funds.
[2] Includes the elimination of NDT fund activity for the Regulatory Agreement Units, including the elimination of net income taxes related to all NDT fund activity for those units. See Note 15 — Asset Retirement Obligations for additional information regarding the accounting for nuclear decommissioning.
[3] See Note 14—Income Taxes for discussion of the penalty related to the Tax Court’s decision on Exelon’s like-kind exchange tax position.
[4] In January 2015, in connection with Generation's $750 million issuance of five-year Senior Unsecured Notes, Exelon terminated certain floating-to-fixed interest rate swaps. As the original forecasted transactions were a series of future interest payments over a ten-year period, a portion of the anticipated interest payments are probable not to occur. As a result, $26 million of anticipated payments were reclassified from AOCI to Other, net in Exelon's Consolidated Statements of Operations and Comprehensive Income.
[5] (e)See Note 13—Debt and Credit Agreements and Note 4—Mergers, Acquisitions and Dispositions for additional information on the PHI merger related debt exchange.
[6] Amounts in parenthesis represent a decrease in net income.