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Retirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2018
Retirement Benefits [Abstract] |
Schedule Of Pension And Other Postretirement Participation | The table below shows the pension and other postretirement benefit plans in which employees of each operating company participated at December 31, 2018:
|  | Operating Company(e)
Name of Plan: |  | Generation |  | ComEd |  | PECO |  | BGE |  | BSC |  | PHI |  | Pepco |  | DPL |  | ACE
Qualified Pension Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exelon Corporation Retirement Program(a) |  | X |  | X |  | X |  | X |  | X |  | X |  | X |  |  |  |
Exelon Corporation Cash Balance Pension Plan(a) |  | X |  | X |  | X |  | X |  | X |  | X |  | X |  | X |  | X
Exelon Corporation Pension Plan for Bargaining Unit Employees(a) |  | X |  | X |  |  |  |  |  | X |  |  |  |  |  |  |  |
Exelon New England Union Employees Pension Plan(a) |  | X |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exelon Employee Pension Plan for Clinton, TMI and Oyster Creek(a) |  | X |  | X |  | X |  |  |  | X |  |  |  |  |  |  |  |
Pension Plan of Constellation Energy Group, Inc.(b) |  | X |  | X |  | X |  | X |  | X |  | X |  |  |  | X |  |
Pension Plan of Constellation Energy Nuclear Group, LLC(c) |  | X |  | X |  |  |  | X |  | X |  | X |  |  |  |  |  |
Nine Mile Point Pension Plan(c) |  | X |  |  |  |  |  |  |  | X |  |  |  |  |  |  |  |
Constellation Mystic Power, LLC Union Employees Pension Plan Including Plan A and Plan B(b) |  | X |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pepco Holdings LLC Retirement Plan(d) |  | X |  | X |  | X |  | X |  | X |  | X |  | X |  | X |  | X
Non-Qualified Pension Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exelon Corporation Supplemental Pension Benefit Plan and 2000 Excess Benefit Plan(a) |  | X |  | X |  | X |  |  |  | X |  | X |  |  |  |  |  |
Exelon Corporation Supplemental Management Retirement Plan(a) |  | X |  | X |  | X |  | X |  | X |  | X |  |  |  |  |  |
Constellation Energy Group, Inc. Senior Executive Supplemental Plan(b) |  | X |  |  |  |  |  | X |  | X |  |  |  |  |  |  |  |
Constellation Energy Group, Inc. Supplemental Pension Plan(b) |  | X |  |  |  |  |  | X |  | X |  |  |  |  |  |  |  |
Constellation Energy Group, Inc. Benefits Restoration Plan(b) |  | X |  | X |  |  |  | X |  | X |  | X |  |  |  |  |  |
Constellation Energy Nuclear Plan, LLC Executive Retirement Plan(c) |  | X |  |  |  |  |  |  |  | X |  |  |  |  |  |  |  |
Constellation Energy Nuclear Plan, LLC Benefits Restoration Plan(c) |  | X |  |  |  |  |  |  |  | X |  |  |  |  |  |  |  |
Baltimore Gas & Electric Company Executive Benefit Plan(b) |  | X |  |  |  |  |  | X |  | X |  |  |  |  |  |  |  |
Baltimore Gas & Electric Company Manager Benefit Plan(b) |  | X |  | X |  |  |  | X |  | X |  |  |  |  |  |  |  |
Pepco Holdings LLC 2011 Supplemental Executive Retirement Plan(d) |  |  |  |  |  |  |  |  |  | X |  | X |  | X |  | X |  | X
Conectiv Supplemental Executive Retirement Plan (d) |  | X |  |  |  |  |  |  |  | X |  | X |  |  |  | X |  | X
Pepco Holdings LLC Combined Executive Retirement Plan (d) |  |  |  |  |  |  |  |  |  | X |  | X |  | X |  |  |  |
Atlantic City Electric Director Retirement Plan (d) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | X
|  | Operating Company(e)
Name of Plan: |  | Generation |  | ComEd |  | PECO |  | BGE |  | BSC |  | PHI |  | Pepco |  | DPL |  | ACE
Other Postretirement Benefit Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PECO Energy Company Retiree Medical Plan(a) |  | X |  | X |  | X |  | X |  | X |  | X |  | X |  | X |  | X
Exelon Corporation Health Care Program(a) |  | X |  | X |  | X |  | X |  | X |  | X |  | X |  |  |  | X
Exelon Corporation Employees’ Life Insurance Plan(a) |  | X |  | X |  | X |  | X |  | X |  |  |  |  |  |  |  |
Exelon Corporation Health Reimbursement Arrangement Plan(a) |  | X |  | X |  | X |  | X |  | X |  |  |  |  |  |  |  |
Constellation Energy Group, Inc. Retiree Medical Plan(b) |  | X |  | X |  | X |  | X |  | X |  |  |  |  |  |  |  |
Constellation Energy Group, Inc. Retiree Dental Plan(b) |  | X |  |  |  |  |  | X |  | X |  |  |  |  |  |  |  |
Constellation Energy Group, Inc. Employee Life Insurance Plan and Family Life Insurance Plan(b) |  | X |  | X |  | X |  | X |  | X |  |  |  |  |  |  |  |
Constellation Mystic Power, LLC Post-Employment Medical Account Savings Plan(b) |  | X |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exelon New England Union Post-Employment Medical Savings Account Plan(a) |  | X |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retiree Medical Plan of Constellation Energy Nuclear Group LLC(c) |  | X |  |  |  |  |  | X |  | X |  |  |  |  |  |  |  |
Retiree Dental Plan of Constellation Energy Nuclear Group LLC(c) |  | X |  |  |  |  |  | X |  | X |  |  |  |  |  |  |  |
Nine Mile Point Nuclear Station, LLC Medical Care and Prescription Drug Plan for Retired Employees(c) |  | X |  |  |  |  |  |  |  | X |  |  |  |  |  |  |  |
Pepco Holdings LLC Welfare Plan for Retirees(d) |  | X |  | X |  | X |  | X |  | X |  | X |  | X |  | X |  | X
______________________
(a) | These plans are collectively referred to as the legacy Exelon plans.
(b) | These plans are collectively referred to as the legacy Constellation Energy Group (CEG) Plans.
(c) | These plans are collectively referred to as the legacy CENG plans.
(d) | These plans are collectively referred to as the legacy PHI plans.
(e) | Employees generally remain in their legacy benefit plans when transferring between operating companies.
Defined Benefit Plan Change In Benefit Obligation RollForward | The following tables provide a rollforward of the changes in the benefit obligations and plan assets for the most recent two years for all plans combined:
| Pension Benefits |  | Other Postretirement Benefits
Exelon | 2018 |  | 2017 |  | 2018 |  | 2017
Change in benefit obligation: |  |  |  |  |  |  |
Net benefit obligation at beginning of year | $ | 22,337 |  |  | $ | 21,060 |  |  | $ | 4,856 |  |  | $ | 4,457 |
Service cost | 405 |  |  | 387 |  |  | 112 |  |  | 106 |
Interest cost | 802 |  |  | 842 |  |  | 175 |  |  | 182 |
Plan participants’ contributions | — |  |  | — |  |  | 45 |  |  | 53 |
Actuarial (gain) loss(a) | (1,561 | ) |  | 1,182 |  |  | (540 | ) |  | 350 |
Plan amendments | (4 | ) |  | 9 |  |  | — |  |  | — |
Acquisitions(b) | — |  |  | 16 |  |  | — |  |  | 17 |
Settlements | (48 | ) |  | (34 | ) |  | (4 | ) |  | — |
Gross benefits paid | (1,239 | ) |  | (1,125 | ) |  | (275 | ) |  | (309 | )
Net benefit obligation at end of year | $ | 20,692 |  |  | $ | 22,337 |  |  | $ | 4,369 |  |  | $ | 4,856 |
| Pension Benefits |  | Other Postretirement Benefits
Exelon | 2018 |  | 2017 |  | 2018 |  | 2017
Change in plan assets: |  |  |  |  |  |  |
Fair value of net plan assets at beginning of year | $ | 18,573 |  |  | $ | 16,791 |  |  | $ | 2,732 |  |  | $ | 2,578 |
Actual return on plan assets | (945 | ) |  | 2,600 |  |  | (136 | ) |  | 346 |
Employer contributions | 337 |  |  | 341 |  |  | 46 |  |  | 64 |
Plan participants’ contributions | — |  |  | — |  |  | 45 |  |  | 53 |
Gross benefits paid | (1,239 | ) |  | (1,125 | ) |  | (275 | ) |  | (309 | )
Settlements | (48 | ) |  | (34 | ) |  | (4 | ) |  | — |
Fair value of net plan assets at end of year | $ | 16,678 |  |  | $ | 18,573 |  |  | $ | 2,408 |  |  | $ | 2,732 |
__________
(a) | The pension actuarial gain in 2018 primarily reflects an increase in the discount rate. The OPEB actuarial gain in 2018 primarily reflects an increase in the discount rate and favorable health care claims experience. The pension and OPEB actuarial losses in 2017 primarily reflect a decrease in the discount rate.
(b) | Exelon recorded pension and OPEB obligations associated with its acquisition of Fitzpatrick on March 31, 2017.
Schedule of Amounts Recognized in Balance Sheet | Exelon presents its benefit obligations and plan assets net on its balance sheet within the following line items:
| Pension Benefits |  | Other Postretirement Benefits
Exelon | 2018 |  | 2017 |  | 2018 |  | 2017
Other current liabilities | $ | 26 |  |  | $ | 28 |  |  | $ | 33 |  |  | $ | 31 |
Pension obligations | 3,988 |  |  | 3,736 |  |  | — |  |  | — |
Non-pension postretirement benefit obligations | — |  |  | — |  |  | 1,928 |  |  | 2,093 |
Unfunded status (net benefit obligation less plan assets) | $ | 4,014 |  |  | $ | 3,764 |  |  | $ | 1,961 |  |  | $ | 2,124 |
Schedule of Defined Benefit Plans Disclosures | The following tables present the components of Exelon’s net periodic benefit costs, prior to capitalization, for the years ended December 31, 2018, 2017 and 2016 and PHI's net periodic benefit costs, prior to capitalization, for the predecessor period of January 1, 2016 to March 23, 2016.
| Pension Benefits |  | Other Postretirement Benefits
Exelon | 2018 |  | 2017(a) |  | 2016(b) |  | 2018 |  | 2017(a) |  | 2016(b)
Components of net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 405 |  |  | $ | 387 |  |  | $ | 354 |  |  | $ | 112 |  |  | $ | 106 |  |  | $ | 107 |
Interest cost | 802 |  |  | 842 |  |  | 830 |  |  | 175 |  |  | 182 |  |  | 185 |
Expected return on assets | (1,252 | ) |  | (1,196 | ) |  | (1,141 | ) |  | (173 | ) |  | (162 | ) |  | (162 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) | 2 |  |  | 1 |  |  | 14 |  |  | (186 | ) |  | (188 | ) |  | (185 | )
Actuarial loss | 629 |  |  | 607 |  |  | 554 |  |  | 66 |  |  | 61 |  |  | 63 |
Settlement and other charges(c) | 3 |  |  | 3 |  |  | 2 |  |  | 1 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 589 |  |  | $ | 644 |  |  | $ | 613 |  |  | $ | (5 | ) |  | $ | (1 | ) |  | $ | 8 |
__________
(a) | FitzPatrick net benefit costs are included for the period after acquisition.
(b) | PHI net periodic benefit costs for the period prior to the merger are not included in the table above.
(c) | 2016 amount includes an additional termination benefit for PHI.
| Predecessor
| Pension Benefits |  | Other Postretirement Benefits
PHI | January 1, 2016 to March 23, 2016 |  | January 1, 2016 to March 23, 2016
Components of net periodic benefit cost: |  |  |
Service cost | $ | 12 |  |  | $ | 1 |
Interest cost | 26 |  |  | 6 |
Expected return on assets | (30 | ) |  | (5 | )
Amortization of: |  |  |
Prior service cost (credit) | — |  |  | (3 | )
Actuarial loss | 14 |  |  | 2 |
Net periodic benefit cost | $ | 22 |  |  | $ | 1 |
The following table provides the components of gross accumulated other comprehensive loss and regulatory assets (liabilities) that have not been recognized as components of periodic benefit cost at December 31, 2018 and 2017, respectively, for all plans combined:
| Exelon |  |  | Exelon
| Pension Benefits |  |  | Other Postretirement Benefits
| 2018 |  | 2017 |  |  | 2018 |  | 2017
Prior service (credit) cost | $ | (29 | ) |  | $ | (24 | ) |  |  | $ | (337 | ) |  | $ | (522 | )
Actuarial loss | 7,558 |  |  | 7,556 |  |  |  | 531 |  |  | 829 |
Total | $ | 7,529 |  |  | $ | 7,532 |  |  |  | $ | 194 |  |  | $ | 307 |
Total included in AOCI | $ | 3,899 |  |  | $ | 3,896 |  |  |  | $ | 70 |  |  | $ | 125 |
Total included in regulatory assets (liabilities) | $ | 3,630 |  |  | $ | 3,636 |  |  |  | $ | 124 |  |  | $ | 182 |
Changes In Plan Assets And Benefit Obligations Recognized In OCI And Regulatory Assets | The following tables provide the components of AOCI and regulatory assets (liabilities) for the years ended December 31, 2018, 2017 and 2016 for all plans combined and the components of PHI's predecessor AOCI and regulatory assets (liabilities) for the period January 1, 2016 to March 23, 2016.
| Pension Benefits |  | Other Postretirement Benefits
Exelon | 2018 |  | 2017 |  | 2016(a) |  | 2018 |  | 2017 |  | 2016(a)
Changes in plan assets and benefit obligations recognized in AOCI and regulatory assets (liabilities): |  |  |  |  |  |  |  |  |  |  |
Current year actuarial (gain) loss | $ | 635 |  |  | $ | (222 | ) |  | $ | 644 |  |  | $ | (232 | ) |  | $ | 166 |  |  | $ | (101 | )
Amortization of actuarial loss | (629 | ) |  | (607 | ) |  | (554 | ) |  | (66 | ) |  | (61 | ) |  | (63 | )
Current year prior service cost (credit) | (4 | ) |  | 9 |  |  | (60 | ) |  | — |  |  | — |  |  | — |
Amortization of prior service (cost) credit | (2 | ) |  | (1 | ) |  | (14 | ) |  | 186 |  |  | 188 |  |  | 185 |
Settlements | (3 | ) |  | (3 | ) |  | — |  |  | — |  |  | — |  |  | — |
Acquisitions | — |  |  | — |  |  | 994 |  |  | — |  |  | — |  |  | 94 |
Total recognized in AOCI and regulatory assets (liabilities) | $ | (3 | ) |  | $ | (824 | ) |  | $ | 1,010 |  |  | $ | (112 | ) |  | $ | 293 |  |  | $ | 115 |
Total recognized in AOCI | $ | 3 |  |  | $ | (401 | ) |  | $ | 51 |  |  | $ | (55 | ) |  | $ | 168 |  |  | $ | 20 |
Total recognized in regulatory assets (liabilities) | $ | (6 | ) |  | $ | (423 | ) |  | $ | 959 |  |  | $ | (57 | ) |  | $ | 125 |  |  | $ | 95 |
| Predecessor
| Pension Benefits |  | Other Postretirement Benefits
PHI | January 1, 2016 to March 23, 2016 |  | January 1, 2016 to March 23, 2016
Changes in plan assets and benefit obligations recognized in AOCI and regulatory assets (liabilities): |  |  |
Current year actuarial loss (gain) | $ | — |  |  | $ | — |
Amortization of actuarial loss | (14 | ) |  | (2 | )
Amortization of prior service (cost) credit | — |  |  | 3 |
Total recognized in AOCI and regulatory assets (liabilities) | $ | (14 | ) |  | $ | 1 |
Total recognized in AOCI | $ | (1 | ) |  | $ | — |
Total recognized in regulatory assets (liabilities) | $ | (13 | ) |  | $ | 1 |
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] |
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation [Table Text Block] | The following assumptions were used to determine the benefit obligations for the plans at December 31, 2018, 2017 and 2016. Assumptions used to determine year-end benefit obligations are the assumptions used to estimate the subsequent year’s net periodic benefit costs.
| Pension Benefits |  | Other Postretirement Benefits |
Exelon | 2018 |  | 2017 |  | 2016(f) |  | 2018 |  | 2017 |  | 2016(f) |
Discount rate | 4.31 | % | (a) | 3.62 | % | (b) | 4.04 | % | (c) | 4.30 | % | (a) | 3.61 | % | (b) | 4.04 | % | (c)
Investment Crediting Rate | 4.46 | % |  | 4.00 | % |  | 4.46 | % |  | N/A |  | N/A |  | N/A |  |
Rate of compensation increase |  | (d) |  | (d) |  | (e) |  | (d) |  | (d) |  | (e)
Mortality table | RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted) |  | RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted) |  | RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted) |  | RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted) |  | RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted) |  | RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted) |
Health care cost trend on covered charges | N/A |  | N/A |  | N/A |  | 5.00% with ultimate trend of 5.00% in 2017 |  | 5.00% with ultimate trend of 5.00% in 2017 |  | 5.00% decreasing to ultimate trend of 5.00% in 2017 |
__________
(a) | The discount rates above represent the blended rates used to determine the majority of Exelon’s pension and other postretirement benefits obligations as of December 31, 2018. Certain benefit plans used individual rates ranging from 4.13% - 4.36% and 4.27% - 4.38% for pension and other postretirement plans, respectively.
(b) | The discount rates above represent the blended rates used to determine the majority of Exelon’s pension and other postretirement benefits obligations as of December 31, 2017. Certain benefit plans used individual rates ranging from 3.49% - 3.65% and 3.57% - 3.68% for pension and other postretirement plans, respectively.
(c) | The discount rates above represent the blended rates used to determine the majority of Exelon’s pension and other postretirement benefits obligations as of December 31, 2016. Certain benefit plans used individual rates ranging from 3.66% - 4.11% and 4.00% - 4.17% for pension and other postretirement plans, respectively.
(d) | 3.25% through 2019 and 3.75% thereafter.
(e) | The legacy Exelon, CEG and CENG pension and other postretirement plans used a rate of compensation increase of 3.25% through 2019 and 3.75% thereafter, while the legacy PHI pension and other postretirement plans used a weighted-average rate of compensation increase of 5% for all periods.
(f) | Obligation was not remeasured for the PHI predecessor for the period from January 1, 2016, to March 23, 2016
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost [Table Text Block] | The following assumptions were used to determine the net periodic benefit costs for the plans for the years ended December 31, 2018, 2017 and 2016, as well as for the PHI predecessor period January 1, 2016 to March 23, 2016:
| Pension Benefits |  | Other Postretirement Benefits |
Exelon | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016 |
Discount rate | 3.62 | % | (a) | 4.04 | % | (b) | 4.29 | % | (c) | 3.61 | % | (a) | 4.04 | % | (b) | 4.29 | % | (c)
Investment Crediting Rate | 4.00 | % |  | 4.46 | % |  | 5.31 | % |  | N/A |  |  | N/A |  |  | N/A |  |
Expected return on plan assets | 7.00 | % | (d) | 7.00 | % | (d) | 7.00 | % | (d) | 6.60 | % | (d) | 6.58 | % | (d) | 6.71 | % | (d)
Rate of compensation increase |  |  | (e) |  | (f) |  | (f) |  |  | (e) |  | (f) |  | (f)
Mortality table | RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted) |  | RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted) |  | RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted) |  | RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted) |  | RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted) |  | RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted) |
Health care cost trend on covered charges | N/A |  | N/A |  | N/A |  | 5.00% with ultimate trend of 5.00% in 2017 |  | 5.00% with ultimate trend of 5.00% in 2017 |  | 5.50% decreasing to ultimate trend of 5.00% in 2017 |
| Predecessor
| Pension Benefits |  | Other Postretirement Benefits
PHI | January 1, 2016 to March 23, 2016 |  | January 1, 2016 to March 23, 2016
Discount rate | 4.65%/4.55% |  | (g) | 4.55 | %
Investment crediting rate | 2.89 | % |  | N/A |
Expected return on plan assets(h) | 6.50 | % |  | 6.75 | %
Rate of compensation increase | 5.00 | % |  | 5.00 | %
Mortality table | RP-2014 table with improvement scale MP-2015 |  | RP-2014 table with improvement scale MP-2015
Health care cost trend on covered charges | N/A |  | 6.33% pre-65 and 5.40% post-65 decreasing to ultimate trend of 5.00% in 2020
__________
(a) | The discount rates above represent the blended rates used to establish the majority of Exelon’s pension and other postretirement benefits costs for the year ended December 31, 2018. Certain benefit plans used individual rates ranging from 3.49%-3.65% and 3.57%-3.68% for pension and other postretirement plans, respectively.
(b) | The discount rates above represent the blended rates used to establish the majority of Exelon's pension and other postretirement benefits costs for the year ended December 31, 2017. Certain benefit plans used individual rates ranging from 3.66%-4.11% and 4.00%-4.17% for pension and other postretirement plans, respectively.
(c) | The discount rates above represent the blended rates used to establish the majority of Exelon’s pension and other postretirement benefits costs for the year ended December 31, 2016. Certain benefit plans used the individual rates ranging from 3.68%-4.14% and 4.32%-4.43% for pension and other postretirement plans, respectively.
(d) | Not applicable to pension and other postretirement benefit plans that do not have plan assets.
(e) | 3.25% through 2019 and 3.75% thereafter.
(f) | The legacy Exelon, CEG and CENG pension and other postretirement plans used a rate of compensation increase of 3.25% through 2019 and 3.75% thereafter, while the legacy PHI pension and other postretirement plans used a weighted-average rate of compensation increase of 5% for all periods.
(g) | The discount rate for the qualified and non-qualified pension plans was 4.65% and 4.55%, respectively.
(h) | Expected return on other postretirement benefit plan assets is pre-tax.
Pension And Other Postretirement Benefit Contributions [Table Text Block] | s The following tables provide contributions to the pension and other postretirement benefit plans:
| Pension Benefits |  | Other Postretirement Benefits
| 2018(a) |  | 2017(a) |  | 2016(a) |  | 2018 |  | 2017 |  | 2016
Exelon | $ | 337 |  |  | $ | 341 |  |  | $ | 347 |  |  | $ | 46 |  |  | $ | 64 |  |  | $ | 50 |
Generation | 128 |  |  | 137 |  |  | 140 |  |  | 11 |  |  | 11 |  |  | 12 |
ComEd | 38 |  |  | 36 |  |  | 33 |  |  | 4 |  |  | 5 |  |  | 5 |
PECO | 28 |  |  | 24 |  |  | 30 |  |  | — |  |  | — |  |  | — |
BGE | 40 |  |  | 39 |  |  | 31 |  |  | 14 |  |  | 14 |  |  | 18 |
BSC(b) | 41 |  |  | 38 |  |  | 39 |  |  | 5 |  |  | 2 |  |  | 3 |
Pepco | 6 |  |  | 62 |  |  | 24 |  |  | 11 |  |  | 10 |  |  | 8 |
DPL | — |  |  | — |  |  | 22 |  |  | — |  |  | 2 |  |  | — |
ACE | 6 |  |  | — |  |  | 15 |  |  | — |  |  | 20 |  |  | 2 |
PHISCO (c) | 50 |  |  | 5 |  |  | 17 |  |  | 1 |  |  | — |  |  | 2 |
| Pension Benefits |  | Other Postretirement Benefits
| Successor |  |  | Predecessor |  | Successor |  |  | Predecessor
| 2018 |  | 2017 |  | March 24, 2016 to December 31, 2016 |  |  | January 1, 2016 to March 23, 2016 |  | 2018 |  | 2017 |  | March 24, 2016 to December 31, 2016 |  |  | January 1, 2016 to March 23, 2016
PHI | $ | 62 |  |  | $ | 67 |  |  | $ | 74 |  |  |  | $ | 4 |  |  | $ | 12 |  |  | $ | 32 |  |  | $ | 12 |  |  |  | $ | — |
__________
(a) | Exelon's and Generation's pension contributions include $21 million and $25 million related to the legacy CENG plans that was funded by CENG as provided in an Employee Matters Agreement (EMA) between Exelon and CENG for the years ended December 31, 2017 and 2016, respectively. There were no pension contributions for the year ended December 31, 2018.
(b) | Includes $2 million, $4 million, and $6 million of pension contributions funded by Exelon Corporate, for the years ended December 31, 2018, 2017, and 2016, respectively.
(c)
:
| Qualified Pension Plans |  | Non-Qualified Pension Plans |  | Other Postretirement Benefits
Exelon | $ | 301 |  |  | $ | 25 |  |  | $ | 44 |
Generation | 135 |  |  | 7 |  |  | 13 |
ComEd | 65 |  |  | 1 |  |  | 2 |
PECO | 25 |  |  | 1 |  |  | — |
BGE | 34 |  |  | 1 |  |  | 15 |
BSC | 41 |  |  | 7 |  |  | 2 |
PHI | 1 |  |  | 8 |  |  | 12 |
Pepco | — |  |  | 2 |  |  | 10 |
DPL | — |  |  | 1 |  |  | — |
ACE | — |  |  | — |  |  | 1 |
PHISCO | 1 |  |  | 5 |  |  | 1 |
Schedule of Expected Benefit Payments [Table Text Block] | Estimated Future Benefit Payments Estimated future benefit payments to participants in all of the pension plans and postretirement benefit plans at December 31, 2018 were:
| Pension Benefits |  | Other Postretirement Benefits
2019 | $ | 1,196 |  |  | $ | 255 |
2020 | 1,221 |  |  | 263 |
2021 | 1,258 |  |  | 269 |
2022 | 1,284 |  |  | 274 |
2023 | 1,302 |  |  | 282 |
2024 through 2028 | 6,770 |  |  | 1,483 |
Total estimated future benefit payments through 2028 | $ | 13,031 |  |  | $ | 2,826 |
Schedule Of Pension And Other Postretirement Benefit Costs [Table Text Block] |
For the Years Ended December 31, | Exelon |  | Generation(a) |  | ComEd |  | PECO |  | BGE |  | BSC(b) |  | Pepco(c) |  | DPL(c) |  | ACE(c) |  | PHISCO(c)(d)
2018 | $ | 583 |  |  | $ | 204 |  |  | $ | 177 |  |  | $ | 18 |  |  | $ | 60 |  |  | $ | 57 |  |  | $ | 15 |  |  | $ | 6 |  |  | $ | 12 |  |  | $ | 34 |
2017 | 643 |  |  | 227 |  |  | 176 |  |  | 29 |  |  | 64 |  |  | 53 |  |  | 25 |  |  | 13 |  |  | 13 |  |  | 43 |
2016 | 621 |  |  | 218 |  |  | 166 |  |  | 33 |  |  | 68 |  |  | 48 |  |  | 31 |  |  | 18 |  |  | 15 |  |  | 47 |
| Successor |  |  | Predecessor
PHI | For the Year Ended December 31, 2018 |  | For the Year Ended December 31, 2017 |  | March 24, 2016 to December 31, 2016 |  |  | January 1, 2016 to March 23, 2016
Pension and Other Postretirement Benefit Costs | $ | 67 |  |  | $ | 94 |  |  | $ | 88 |  |  |  | $ | 23 |
__________
(a) | FitzPatrick net benefit costs are included for the period after acquisition.
(b) | These amounts primarily represent amounts billed to Exelon’s subsidiaries through intercompany allocations. These amounts are not included in the Generation, ComEd, PECO, BGE, PHI, Pepco, DPL or ACE amounts
Defined Benefit Plan Weighted Average Asset Allocations And Target Allocations [Table Text Block] | ively. Exelon’s pension and other postretirement benefit plan target asset allocations at December 31, 2018 and 2017 asset allocations were as follows: Pension Plans
|  |  | Exelon
|  |  | Percentage of Plan Assets at December 31,
Asset Category | Target Allocation |  | 2018 |  | 2017
Equity securities | 35 | % |  | 32 | % |  | 35 | %
Fixed income securities | 37 | % |  | 38 |  |  | 39 |
Alternative investments(a) | 28 | % |  | 30 |  |  | 26 |
Total |  |  | 100 | % |  | 100 | %
Other Postretirement Benefit Plans
|  |  | Exelon
|  |  | Percentage of Plan Assets at December 31,
Asset Category | Target Allocation |  | 2018 |  | 2017
Equity securities | 47 | % |  | 44 | % |  | 47 | %
Fixed income securities | 28 | % |  | 28 |  |  | 28 |
Alternative investments(a) | 25 | % |  | 28 |  |  | 25 |
Total |  |  | 100 | % |  | 100 | %
__________
(a) | Alternative investments include private equity, hedge funds, real estate, and private credit
Defined Benefit Plan Fair Value Of Plan Assets [Text Block] | Fair Value Measurements The following tables present pension and other postretirement benefit plan assets measured and recorded at fair value in the Registrants' Consolidated Balance Sheets on a recurring basis and their level within the fair value hierarchy at December 31, 2018 and 2017: Exelon
December 31, 2018(a) | Level 1 |  | Level 2 |  | Level 3 |  | Not subject to leveling |  | Total
Pension plan assets |  |  |  |  |  |  |  |  |
Cash equivalents | $ | 350 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 350 |
Equities(c) | 3,364 |  |  | — |  |  | 2 |  |  | 1,980 |  |  | 5,346 |
Fixed income: |  |  |  |  |  |  |  |  |
U.S. Treasury and agencies | 996 |  |  | 173 |  |  | — |  |  | — |  |  | 1,169 |
State and municipal debt | — |  |  | 59 |  |  | — |  |  | — |  |  | 59 |
Corporate debt | — |  |  | 3,716 |  |  | 216 |  |  | — |  |  | 3,932 |
Other(c) | — |  |  | 329 |  |  | — |  |  | 613 |  |  | 942 |
Fixed income subtotal | 996 |  |  | 4,277 |  |  | 216 |  |  | 613 |  |  | 6,102 |
Private equity | — |  |  | — |  |  | — |  |  | 1,219 |  |  | 1,219 |
Hedge funds | — |  |  | — |  |  | — |  |  | 1,608 |  |  | 1,608 |
Real estate | — |  |  | — |  |  | — |  |  | 1,029 |  |  | 1,029 |
Private credit | — |  |  | — |  |  | 268 |  |  | 798 |  |  | 1,066 |
Pension plan assets subtotal | $ | 4,710 |  |  | $ | 4,277 |  |  | $ | 486 |  |  | $ | 7,247 |  |  | $ | 16,720 |
December 31, 2018(a) | Level 1 |  | Level 2 |  | Level 3 |  | Not subject to leveling |  | Total
Other postretirement benefit plan assets |  |  |  |  |  |  |  |  |
Cash equivalents | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 22 |
Equities | 537 |  |  | 2 |  |  | — |  |  | 508 |  |  | 1,047 |
Fixed income: |  |  |  |  |  |  |  |  |
U.S. Treasury and agencies | 11 |  |  | 56 |  |  | — |  |  | — |  |  | 67 |
State and municipal debt | — |  |  | 126 |  |  | — |  |  | — |  |  | 126 |
Corporate debt | — |  |  | 48 |  |  | — |  |  | — |  |  | 48 |
Other | 183 |  |  | 72 |  |  | — |  |  | 170 |  |  | 425 |
Fixed income subtotal | 194 |  |  | 302 |  |  | — |  |  | 170 |  |  | 666 |
Hedge funds | — |  |  | — |  |  | — |  |  | 411 |  |  | 411 |
Real estate | — |  |  | — |  |  | — |  |  | 132 |  |  | 132 |
Private credit | — |  |  | — |  |  | — |  |  | 132 |  |  | 132 |
Other postretirement benefit plan assets subtotal | $ | 753 |  |  | $ | 304 |  |  | $ | — |  |  | $ | 1,353 |  |  | $ | 2,410 |
Total pension and other postretirement benefit plan assets(e) | $ | 5,463 |  |  | $ | 4,581 |  |  | $ | 486 |  |  | $ | 8,600 |  |  | $ | 19,130 |
December 31, 2017(a)(b) | Level 1 |  | Level 2 |  | Level 3 |  | Not subject to leveling |  | Total
Pension plan assets |  |  |  |  |  |  |  |  |
Cash equivalents | $ | 585 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 585 |
Equities(c) | 3,565 |  |  | — |  |  | 2 |  |  | 3,077 |  |  | 6,644 |
Fixed income: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and agencies | 1,150 |  |  | 159 |  |  | — |  |  | — |  |  | 1,309 |
State and municipal debt | — |  |  | 64 |  |  | — |  |  | — |  |  | 64 |
Corporate debt | — |  |  | 3,931 |  |  | 232 |  |  | — |  |  | 4,163 |
Other(c) | — |  |  | 447 |  |  | — |  |  | 756 |  |  | 1,203 |
Fixed income subtotal | 1,150 |  |  | 4,601 |  |  | 232 |  |  | 756 |  |  | 6,739 |
Private equity | — |  |  | — |  |  | — |  |  | 1,034 |  |  | 1,034 |
Hedge funds | — |  |  | — |  |  | — |  |  | 1,770 |  |  | 1,770 |
Real estate | — |  |  | — |  |  | — |  |  | 884 |  |  | 884 |
Private credit(d) | — |  |  | — |  |  | 224 |  |  | 695 |  |  | 919 |
Pension plan assets subtotal | $ | 5,300 |  |  | $ | 4,601 |  |  | $ | 458 |  |  | $ | 8,216 |  |  | $ | 18,575 |
December 31, 2017(a)(b) | Level 1 |  | Level 2 |  | Level 3 |  | Not subject to leveling |  | Total
Other postretirement benefit plan assets |  |  |  |  |  |  |  |  |
Cash equivalents | $ | 29 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 29 |
Equities | 523 |  |  | 2 |  |  | — |  |  | 764 |  |  | 1,289 |
Fixed income: |  |  |  |  |  |  |  |  |
U.S. Treasury and agencies | 13 |  |  | 56 |  |  | — |  |  | — |  |  | 69 |
State and municipal debt | — |  |  | 136 |  |  | — |  |  | — |  |  | 136 |
Corporate debt | — |  |  | 47 |  |  | — |  |  | — |  |  | 47 |
Other | 225 |  |  | 71 |  |  | — |  |  | 185 |  |  | 481 |
Fixed income subtotal | 238 |  |  | 310 |  |  | — |  |  | 185 |  |  | 733 |
Hedge funds | — |  |  | — |  |  | — |  |  | 430 |  |  | 430 |
Real estate | — |  |  | — |  |  | — |  |  | 124 |  |  | 124 |
Private credit | — |  |  | — |  |  | — |  |  | 123 |  |  | 123 |
Other postretirement benefit plan assets subtotal | $ | 790 |  |  | $ | 312 |  |  | $ | — |  |  | $ | 1,626 |  |  | $ | 2,728 |
Total pension and other postretirement benefit plan assets(e) | $ | 6,090 |  |  | $ | 4,913 |  |  | $ | 458 |  |  | $ | 9,842 |  |  | $ | 21,303 |
__________
(a) | See Note 11—Fair Value of Financial Assets and Liabilities for a description of levels within the fair value hierarchy.
(b) | Effective March 31, 2017, Exelon became sponsor of FitzPatrick's defined benefit pension and other postretirement benefit plans, and assumed FitzPatrick's benefit plan obligations.
(c) | Includes derivative instruments of less than $1 million and $6 million, which have a total notional amount of $5,991 million and $3,606 million at December 31, 2018 and 2017, respectively. The notional principal amounts for these instruments provide one measure of the transaction volume outstanding as of the fiscal years ended and do not represent the amount of the company’s exposure to credit or market loss.
(d) | Prior year amounts reflect a reclassification from Not subject to leveling into Level 3.
(e) | Excludes net liabilities of $44 million and net assets of $2 million at December 31, 2018 and 2017, respectively, which are required to reconcile to the fair value of net plan assets. These items consist primarily of receivables or payables related to pending securities sales and purchases, interest and dividends receivable
Schedule of Changes in Fair Value of Plan Assets [Table Text Block] | The following table presents the reconciliation of Level 3 assets and liabilities measured at fair value for pension and other postretirement benefit plans for the years ended December 31, 2018 and 2017: Exelon
| Fixed Income |  | Equities |  | Private Credit |  | Total
Pension Assets |  |  |  |  |  |  |
Balance as of January 1, 2018 | $ | 232 |  |  | $ | 2 |  |  | $ | 224 |  |  | $ | 458 |
Actual return on plan assets: |  |  |  |  |  |  |  |
Relating to assets still held at the reporting date | (14 | ) |  | — |  |  | 9 |  |  | (5 | )
Relating to assets sold during the period | (1 | ) |  | — |  |  | — |  |  | (1 | )
Purchases, sales and settlements: |  |  |  |  |  |  |  |
Purchases | 19 |  |  | — |  |  | 35 |  |  | 54 |
Sales | (8 | ) |  | — |  |  | — |  |  | (8 | )
Settlements(b) | (12 | ) |  | — |  |  | — |  |  | (12 | )
Balance as of December 31, 2018 | $ | 216 |  |  | $ | 2 |  |  | $ | 268 |  |  | $ | 486 |
| Fixed income |  | Equities |  | Private Credit (a) |  | Total
Pension Assets |  |  |  |  |  |  |
Balance as of January 1, 2017 | $ | 206 |  |  | $ | 2 |  |  | $ | 229 |  |  | $ | 437 |
Actual return on plan assets: |  |  |  |  |  |  |  |
Relating to assets still held at the reporting date | 11 |  |  | — |  |  | 29 |  |  | 40 |
Purchases, sales and settlements: |  |  |  |  |  |  |  |
Purchases | 31 |  |  | — |  |  | 5 |  |  | 36 |
Sales | (16 | ) |  | — |  |  | — |  |  | (16 | )
Settlements(b) | — |  |  | — |  |  | (39 | ) |  | (39 | )
Balance as of December 31, 2017 | $ | 232 |  |  | $ | 2 |  |  | $ | 224 |  |  | $ | 458 |
__________
(a) |
Schedule Of Defined Contributions [Table Text Block] | in limits. The following table presents matching contributions to the savings plan for the years ended December 31, 2018, 2017 and 2016:
For the Year Ended December 31, | Exelon(a) |  | Generation(a) |  | ComEd |  | PECO |  | BGE |  | BSC(b) |  | Pepco(c) |  | DPL(c) |  | ACE |  | PHISCO(c)(d)
2018 | $ | 179 |  |  | $ | 86 |  |  | $ | 37 |  |  | $ | 9 |  |  | $ | 12 |  |  | $ | 22 |  |  | $ | 3 |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 6 |
2017 | 128 |  |  | 55 |  |  | 31 |  |  | 10 |  |  | 10 |  |  | 9 |  |  | 3 |  |  | 2 |  |  | 2 |  |  | 6 |
2016 | 164 |  |  | 79 |  |  | 34 |  |  | 10 |  |  | 12 |  |  | 19 |  |  | 3 |  |  | 2 |  |  | 2 |  |  | 6 |
| Successor |  |  | Predecessor
PHI | For the Year Ended December 31, 2018 |  | For the Year Ended December 31, 2017 |  | March 24, 2016 to December 31, 2016 |  |  | January 1, 2016 to March 23, 2016
Saving Plan Matching Contributions | $ | 13 |  |  | $ | 13 |  |  | $ | 10 |  |  |  | $ | 3 |
__________
(a) | Includes $13 million related to CENG for the year ended December 31, 2016.
(b) | These amounts primarily represent amounts billed to Exelon’s subsidiaries through intercompany allocations. These costs are not included in the Generation, ComEd, PECO, BGE, PHI, Pepco, DPL or ACE amounts above.
(c) | Pepco's, DPL's and PHISCO's matching contributions include $1 million, $1 million and $1 million, respectively, of costs incurred prior to the closing of Exelon's merger with PHI on March 23, 2016, which is not included in Exelon's matching contributions for the year ended December 31, 2016.
(d) | These amounts primarily represent amounts billed to Pepco, DPL, and ACE through intercompany allocations. These amounts are not included in Pepco, DPL or ACE amounts above.

X
- Definition This element may be used to capture assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those nonbenefit obligations may be considered as reductions of plan assets. + References No definition available. + Details
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