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Segment Information - Reconciliation to Consolidated Financial Statements (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Segment Reporting Information [Line Items]              
Revenues $ 7,689   $ 8,076   $ 17,166 $ 17,769  
Operating revenues from affiliates 0   0   0 0  
Depreciation, Depletion and Amortization 1,079   1,088   2,154 2,179  
Operating Expenses 6,881   7,138   15,142 15,786  
Interest Revenue (Expense), Net 409   373   813 745  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 644   613   1,926 1,315  
Income taxes 144   66   454 125  
Net income (loss) 494 $ 966 542 $ 636 1,460 1,179  
Payments to Acquire Property, Plant, and Equipment 1,702   1,927   3,572 3,807  
Assets [1] 121,596       121,596   $ 119,666
Pepco Holdings LLC [Member]              
Segment Reporting Information [Line Items]              
Revenues 1,091   1,076   2,319 2,327  
Operating revenues from affiliates 3   3   7 7  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 112   99   234 173  
Income taxes 6   15   11 24  
Net income (loss) 106 117 84 65 223 149  
Payments to Acquire Property, Plant, and Equipment         698 629  
Assets [2] 22,454       22,454   21,984
Exelon Generation Co L L C [Member]              
Segment Reporting Information [Line Items]              
Revenues 4,210   4,579   9,506 10,090  
Operating revenues from affiliates 252   273   569 671  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 202   209   854 412  
Income taxes 78   23   301 32  
Net income (loss) 118 $ 422 181 $ 186 540 368  
Payments to Acquire Property, Plant, and Equipment         890 1,298  
Assets [3] 48,402       48,402   47,556
Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Competitive businesses other revenues 158   147   238 196  
Revenues 7,689   8,076   17,166 17,769  
Net income (loss) 494   542   1,460 1,179  
Assets 121,596       121,596   119,666
Operating Segments [Member] | Pepco Holdings LLC [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax (3)   (7)   12 12  
Revenues     1,076        
Intersegment Eliminations [Member]              
Segment Reporting Information [Line Items]              
Competitive businesses other revenues (1)   (4)   (2) (2)  
Revenues (751)   (779)   (1,537) (1,655)  
Operating revenues from affiliates (750)   (776)   (1,534) (1,650)  
Depreciation, Depletion and Amortization 0   0   0 0  
Operating Expenses (744)   (790)   (1,526) (1,675)  
Interest Revenue (Expense), Net 0   0   0 0  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 0   0   0 0  
Income taxes 0   0   0 0  
Net income (loss) 0   0   0 0  
Payments to Acquire Property, Plant, and Equipment 0   0   0 0  
Assets (10,299)       (10,299)   (9,800)
Intersegment Eliminations [Member] | Pepco Holdings LLC [Member]              
Segment Reporting Information [Line Items]              
Revenues (98)   (109)   (206) (222)  
Operating revenues from affiliates (99)   (109)   (205) (222)  
Depreciation, Depletion and Amortization 0   0   1 (1)  
Operating Expenses (101)   (112)   (204) (223)  
Interest Revenue (Expense), Net 0   0   0 1  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (108)   (88)   (227) (157)  
Income taxes 0   0   (1) 0  
Net income (loss) 3   3   7 7  
Payments to Acquire Property, Plant, and Equipment 0   0   0 0  
Assets (5,839)       (5,839)   (5,421)
Exelon Generation Co L L C [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Competitive businesses other revenues 159   151   240 198  
Revenues 4,210   4,579   9,506 10,090  
Depreciation, Depletion and Amortization 409   466   814 914  
Operating Expenses 4,096   4,298   9,059 9,515  
Interest Revenue (Expense), Net 116   102   227 202  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 202   209   854 412  
Income taxes 78   23   301 32  
Net income (loss) 118   181   540 368  
Payments to Acquire Property, Plant, and Equipment 383   670   890 1,298  
Assets 48,402       48,402   47,556
Exelon Generation Co L L C [Member] | Intersegment Eliminations [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates 252   273   568 672  
Commonwealth Edison Co [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Competitive businesses other revenues 0   0   0 0  
Revenues 1,351   1,398   2,759 2,910  
Depreciation, Depletion and Amortization 257   231   508 459  
Operating Expenses 1,040   1,111   2,174 2,335  
Interest Revenue (Expense), Net 89   85   178 175  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 232   207   429 417  
Income taxes 46   43   85 88  
Net income (loss) 186   164   344 329  
Payments to Acquire Property, Plant, and Equipment 459   495   961 1,026  
Assets 31,889       31,889   31,213
Commonwealth Edison Co [Member] | Intersegment Eliminations [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates 5   5   9 19  
PECO Energy Co [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Competitive businesses other revenues 0   0   0 0  
Revenues 655   653   1,554 1,518  
Depreciation, Depletion and Amortization 83   74   164 149  
Operating Expenses 510   526   1,187 1,249  
Interest Revenue (Expense), Net 33   32   67 64  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 115   95   307 207  
Income taxes 13   (1)   37 (3)  
Net income (loss) 102   96   270 210  
Payments to Acquire Property, Plant, and Equipment 225   194   447 411  
Assets 11,002       11,002   10,642
PECO Energy Co [Member] | Intersegment Eliminations [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates 2   2   3 3  
Baltimore Gas and Electric Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Competitive businesses other revenues 0   0   0 0  
Revenues 649   662   1,625 1,639  
Depreciation, Depletion and Amortization 117   114   252 248  
Operating Expenses 569   578   1,325 1,378  
Interest Revenue (Expense), Net 29   25   58 51  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 56   64   253 220  
Income taxes 11   13   47 41  
Net income (loss) 45   51   206 179  
Payments to Acquire Property, Plant, and Equipment 284   210   542 434  
Assets 10,006       10,006   9,716
Baltimore Gas and Electric Company [Member] | Intersegment Eliminations [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates 6   6   12 12  
Pepco Holdings LLC [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Competitive businesses other revenues 0   0   0 0  
Revenues 1,091   1,076   2,319 2,327  
Depreciation, Depletion and Amortization 188   180   369 363  
Operating Expenses 926   923   1,981 2,048  
Interest Revenue (Expense), Net 67   65   131 128  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 112   99   234 173  
Income taxes 6   15   11 24  
Net income (loss) 106   84   223 149  
Payments to Acquire Property, Plant, and Equipment 340   371   698 629  
Assets 22,454       22,454   21,984
Pepco Holdings LLC [Member] | Intersegment Eliminations [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates 3   3   7 7  
Potomac Electric Power Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenues 531   523   1,106 1,080  
Depreciation, Depletion and Amortization 93   92   186 188  
Operating Expenses 438   438   929 939  
Interest Revenue (Expense), Net 34   32   68 63  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 66   61   123 94  
Income taxes 2   7   4 9  
Net income (loss) 64   54   119 85  
Payments to Acquire Property, Plant, and Equipment 154   160   298 287  
Assets 8,556       8,556   8,299
Potomac Electric Power Company [Member] | Intersegment Eliminations [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates 1   2   3 3  
Delmarva Power and Light Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenues 287   289   667 673  
Depreciation, Depletion and Amortization 45   43   91 88  
Operating Expenses 243   247   550 582  
Interest Revenue (Expense), Net 15   14   30 27  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 34   31   94 69  
Income taxes 4   5   11 12  
Net income (loss) 30   26   83 57  
Payments to Acquire Property, Plant, and Equipment 82   101   160 166  
Assets 4,683       4,683   4,588
Delmarva Power and Light Company [Member] | Intersegment Eliminations [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates 2   2   3 4  
Atlantic City Electric Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenues 274   265   547 575  
Depreciation, Depletion and Amortization 40   36   71 69  
Operating Expenses 246   240   498 526  
Interest Revenue (Expense), Net 15   16   28 32  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 14   10   25 18  
Income taxes 0   2   1 3  
Net income (loss) 14   8   24 15  
Payments to Acquire Property, Plant, and Equipment 99   107   227 170  
Assets 3,886       3,886   3,699
Atlantic City Electric Company [Member] | Intersegment Eliminations [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates 1   1   1 2  
Corporate and Other [Member] | Corporate, Non-Segment [Member]              
Segment Reporting Information [Line Items]              
Competitive businesses other revenues 0   0   0 0  
Revenues 484   487   940 940  
Depreciation, Depletion and Amortization 25   23   47 46  
Operating Expenses 484   492   942 936  
Interest Revenue (Expense), Net 75   64   152 125  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (73)   (61)   (151) (114)  
Income taxes (10)   (27)   (27) (57)  
Net income (loss) (63)   (34)   (123) (56)  
Payments to Acquire Property, Plant, and Equipment 11   (13)   34 9  
Assets 8,142       8,142   8,355
Corporate and Other [Member] | Corporate, Non-Segment [Member] | Pepco Holdings LLC [Member]              
Segment Reporting Information [Line Items]              
Revenues 97   108   205 221  
Depreciation, Depletion and Amortization 10   9   20 19  
Operating Expenses 100   110   208 224  
Interest Revenue (Expense), Net 3   3   5 5  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 106   85   219 149  
Income taxes 0   1   (4) 0  
Net income (loss) (5)   (7)   (10) (15)  
Payments to Acquire Property, Plant, and Equipment 5   3   13 6  
Assets 11,168       11,168   $ 10,819
Corporate and Other [Member] | Intersegment Eliminations [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates 482   487   935 937  
Corporate and Other [Member] | Intersegment Eliminations [Member] | Pepco Holdings LLC [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates 98   107   205 220  
Generation Mid Atlantic [Member]              
Segment Reporting Information [Line Items]              
Revenues 1,189   1,282   2,445 2,722  
Generation Mid Atlantic [Member] | PECO Energy Co Affiliate [Member] | Exelon Generation Co L L C [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates 35   25   80 61  
Generation Mid Atlantic [Member] | Baltimore Gas And Electric Company Affiliate [Member] | Exelon Generation Co L L C [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates 57   63   133 128  
Generation Mid Atlantic [Member] | PotomacElectricPowerCompanyAffiliate [Member] | Exelon Generation Co L L C [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates 52   46   122 98  
Generation Mid Atlantic [Member] | DelmarvaPowerandLightCompanyAffiliate [Member] | Exelon Generation Co L L C [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates 12   30   35 76  
Generation Mid Atlantic [Member] | AtlanticCityElectricCompanyAffiliate [Member] | Exelon Generation Co L L C [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates 5   6   13 12  
Generation Mid Atlantic [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenues 1,183   1,278   2,446 2,712  
Generation Mid Atlantic [Member] | Intersegment Eliminations [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates 6   4   (1) 10  
Generation Midwest [Member]              
Segment Reporting Information [Line Items]              
Revenues 1,034   1,130   2,142 2,475  
Generation Midwest [Member] | Commonwealth Edison Co Affiliate [Member] | Exelon Generation Co L L C [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates 89   103   183 297  
Generation Midwest [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenues 1,042   1,135   2,156 2,479  
Generation Midwest [Member] | Intersegment Eliminations [Member]              
Segment Reporting Information [Line Items]              
Operating revenues from affiliates (8)   (5)   (14) (4)  
Oil and Gas, Purchased [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 333   489   1,213 1,436  
Oil and Gas, Purchased [Member] | Intersegment Eliminations [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   (1) (8)  
Oil and Gas, Purchased [Member] | Exelon Generation Co L L C [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 333   489   1,214 1,444  
Oil and Gas, Purchased [Member] | Commonwealth Edison Co [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Oil and Gas, Purchased [Member] | PECO Energy Co [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Oil and Gas, Purchased [Member] | Baltimore Gas and Electric Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Oil and Gas, Purchased [Member] | Pepco Holdings LLC [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Oil and Gas, Purchased [Member] | Corporate and Other [Member] | Corporate, Non-Segment [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Electricity, US Regulated | Pepco Holdings LLC [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 1,067   1,052   2,205 2,202  
Electricity, US Regulated | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 3,512   3,542   7,343 7,496  
Electricity, US Regulated | Intersegment Eliminations [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax (8)   (9)   (17) (27)  
Electricity, US Regulated | Intersegment Eliminations [Member] | Pepco Holdings LLC [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax (3)   (4)   (7) (8)  
Electricity, US Regulated | Exelon Generation Co L L C [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Electricity, US Regulated | Commonwealth Edison Co [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 1,351   1,398   2,759 2,910  
Electricity, US Regulated | PECO Energy Co [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 566   560   1,185 1,193  
Electricity, US Regulated | Baltimore Gas and Electric Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 540   548   1,198 1,206  
Electricity, US Regulated | Pepco Holdings LLC [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 1,063   1,045   2,218 2,214  
Electricity, US Regulated | Potomac Electric Power Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 531   523   1,106 1,080  
Electricity, US Regulated | Delmarva Power and Light Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 261   261   572 567  
Electricity, US Regulated | Atlantic City Electric Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 274   265   547 575  
Electricity, US Regulated | Corporate and Other [Member] | Corporate, Non-Segment [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Electricity, US Regulated | Corporate and Other [Member] | Corporate, Non-Segment [Member] | Pepco Holdings LLC [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Electricity, Generation [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 3,468   3,669   7,487 7,785  
Electricity, Generation [Member] | Intersegment Eliminations [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax (250)   (270)   (565) (663)  
Electricity, Generation [Member] | Exelon Generation Co L L C [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 3,718   3,939   8,052 8,448  
Electricity, Generation [Member] | Commonwealth Edison Co [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Electricity, Generation [Member] | PECO Energy Co [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Electricity, Generation [Member] | Baltimore Gas and Electric Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Electricity, Generation [Member] | Pepco Holdings LLC [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Electricity, Generation [Member] | Corporate and Other [Member] | Corporate, Non-Segment [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Natural Gas, US Regulated | Pepco Holdings LLC [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 24   28   95 106  
Natural Gas, US Regulated | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 218   230   883 855  
Natural Gas, US Regulated | Operating Segments [Member] | Pepco Holdings LLC [Member]              
Segment Reporting Information [Line Items]              
Revenues         0    
Natural Gas, US Regulated | Intersegment Eliminations [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax (4)   (5)   (8) (9)  
Natural Gas, US Regulated | Intersegment Eliminations [Member] | Pepco Holdings LLC [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Natural Gas, US Regulated | Exelon Generation Co L L C [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Natural Gas, US Regulated | Commonwealth Edison Co [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Natural Gas, US Regulated | PECO Energy Co [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 89   93   369 325  
Natural Gas, US Regulated | Baltimore Gas and Electric Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 109   114   427 433  
Natural Gas, US Regulated | Pepco Holdings LLC [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 24   28   95 106  
Natural Gas, US Regulated | Potomac Electric Power Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Natural Gas, US Regulated | Delmarva Power and Light Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 24   28   95 106  
Natural Gas, US Regulated | Atlantic City Electric Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Natural Gas, US Regulated | Corporate and Other [Member] | Corporate, Non-Segment [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Natural Gas, US Regulated | Corporate and Other [Member] | Corporate, Non-Segment [Member] | Pepco Holdings LLC [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Service, Other [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   (1)   2 1  
Service, Other [Member] | Intersegment Eliminations [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax (488)   (491)   (944) (946)  
Service, Other [Member] | Intersegment Eliminations [Member] | Pepco Holdings LLC [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax (95)   (105)   (199) (214)  
Service, Other [Member] | Exelon Generation Co L L C [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Service, Other [Member] | Commonwealth Edison Co [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Service, Other [Member] | PECO Energy Co [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Service, Other [Member] | Baltimore Gas and Electric Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Service, Other [Member] | Pepco Holdings LLC [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 4   3   6 7  
Service, Other [Member] | Potomac Electric Power Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Service, Other [Member] | Delmarva Power and Light Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 2   0   0 0  
Service, Other [Member] | Atlantic City Electric Company [Member] | Operating Segments [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 0   0   0 0  
Service, Other [Member] | Corporate and Other [Member] | Corporate, Non-Segment [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax 484   487   940 940  
Service, Other [Member] | Corporate and Other [Member] | Corporate, Non-Segment [Member] | Pepco Holdings LLC [Member]              
Segment Reporting Information [Line Items]              
Revenue from Contract with Customer, Including Assessed Tax $ 97   $ 108   $ 205 $ 221  
[1]
Exelon’s consolidated assets include $9,526 million and $9,667 million at June 30, 2019 and December 31, 2018, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Exelon’s consolidated liabilities include $3,568 million and $3,548 million at June 30, 2019 and December 31, 2018, respectively, of certain VIEs for which the VIE creditors do not have recourse to Exelon. See Note 2 — Variable Interest Entities for additional information.
[2]
PHI’s consolidated total assets include $23 million and $33 million at June 30, 2019 and December 31, 2018, respectively, of PHI's consolidated VIE that can only be used to settle the liabilities of the VIE. PHI’s consolidated total liabilities include $55 million and $69 million at June 30, 2019 and December 31, 2018, respectively, of PHI's consolidated VIE for which the VIE creditors do not have recourse to PHI. See Note 2 — Variable Interest Entities for additional information.
[3]
Generation’s consolidated assets include $9,503 million and $9,634 million at June 30, 2019 and December 31, 2018, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Generation’s consolidated liabilities include $3,513 million and $3,480 million at June 30, 2019 and December 31, 2018, respectively, of certain VIEs for which the VIE creditors do not have recourse to Generation. See Note 2 — Variable Interest Entities for additional information.