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Retirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Defined Benefit Plan Change In Benefit Obligation RollForward
The following tables provide a rollforward of the changes in the benefit obligations and plan assets of Exelon for the most recent two years for all plans combined:
Pension BenefitsOPEB
2020201920202019
Change in benefit obligation:
Net benefit obligation at beginning of year$22,868 $20,692 $4,658 $4,369 
Service cost387 357 90 93 
Interest cost757 883 154 188 
Plan participants’ contributions— — 49 44 
Actuarial loss(a)
2,217 2,322 49 250 
Plan amendments— 68 (111)— 
Curtailments— (3)— — 
Settlements(45)(35)(5)(4)
Contractual termination benefits— 1 — — 
Gross benefits paid(1,290)(1,417)(280)(282)
Net benefit obligation at end of year$24,894 $22,868 $4,604 $4,658 
 Pension BenefitsOPEB
2020201920202019
Change in plan assets:
Fair value of net plan assets at beginning of year$18,590 $16,678 $2,541 $2,408 
Actual return on plan assets2,547 3,008 190 324 
Employer contributions542 356 59 51 
Plan participants’ contributions— — 49 44 
Gross benefits paid(1,290)(1,417)(280)(282)
Settlements(45)(35)(5)(4)
Fair value of net plan assets at end of year$20,344 $18,590 $2,554 $2,541 
__________
(a)The pension and OPEB actuarial losses in 2020 and 2019 primarily reflect a decrease in the discount rate. OPEB losses in 2020 were offset by gains related to plan changes.
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 BenefitsOPEB
2020201920202019
Other current liabilities$47 $31 $42 $41 
Pension obligations4,503 4,247 — — 
Non-pension postretirement benefit obligations— — 2,008 2,076 
Unfunded status (net benefit obligation less plan assets)$4,550 $4,278 $2,050 $2,117 
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets
The following table provides the ABO and fair value of plan assets for all pension plans with an ABO in excess of plan assets. Information for pension and OPEB plans with projected benefit obligations (PBO) and accumulated postretirement benefit obligation (APBO), respectively, in excess of plan assets has been disclosed in the Obligations and Plan Assets table above as all pension and OPEB plans are underfunded.
ABO in excess of plan assetsExelon
20202019
ABO$23,514 $21,727 
Fair value of net plan assets20,344 18,590 
Calculation of Net Periodic Benefit Costs [Table Text Block] The following table presents the components of Exelon’s net periodic benefit costs, prior to capitalization, for the years ended December 31, 2020, 2019, and 2018.
 Pension BenefitsOPEB
202020192018202020192018
Components of net periodic benefit cost:
Service cost$387 $357 $405 $90 $93 $112 
Interest cost757 883 802 154 188 175 
Expected return on assets(1,270)(1,225)(1,252)(163)(153)(173)
Amortization of:
Prior service cost (credit)4 — 2 (124)(179)(186)
Actuarial loss512 414 629 49 45 66 
Curtailment benefits— — — (1)— — 
Settlement and other charges14 17 3 1 1 1 
Contractual termination benefits— 1 — — — — 
Net periodic benefit cost$404 $447 $589 $6 $(5)$(5)
Schedule Of Pension And Other Postretirement Benefit Costs [Table Text Block]
The amounts below represent the Registrants' allocated pension and OPEB costs. For Exelon, the service cost component is included in Operating and maintenance expense and Property, plant, and equipment, net while the non-service cost components are included in Other, net and Regulatory assets. For Generation and the Utility Registrants, the service cost and non-service cost components are included in Operating and maintenance expense and Property, plant, and equipment, net in their consolidated financial statements.
For the Years Ended December 31,ExelonGenerationComEdPECOBGEPHIPepcoDPLACE
2020$411 $115 $114 $5 $64 $70 $15 $7 $14 
2019442 135 96 12 61 95 25 15 16 
2018583 204 177 18 60 67 15 6 12 
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 Exelon for the years ended December 31, 2020, 2019, and 2018 for all plans combined.
 Pension BenefitsOPEB
202020192018202020192018
Changes in plan assets and benefit obligations recognized in AOCI and regulatory assets (liabilities):
Current year actuarial loss (gain)$941 $538 $635 $22 $80 $(232)
Amortization of actuarial loss(512)(414)(629)(49)(45)(66)
Current year prior service cost (credit)— 68 (4)(111)— — 
Amortization of prior service (cost) credit(4)— (2)124 179 186 
Curtailments— (3)— 1 — — 
Settlements(14)(17)(3)(1)(1)— 
Total recognized in AOCI and regulatory assets (liabilities)$411 $172 $(3)$(14)$213 $(112)
Total recognized in AOCI$271 $169 $3 $6 $107 $(55)
Total recognized in regulatory assets (liabilities)$140 $3 $(6)$(20)$106 $(57)
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]
The following table provides the components of gross accumulated other comprehensive loss and regulatory assets (liabilities) for Exelon that have not been recognized as components of periodic benefit cost at December 31, 2020 and 2019, respectively, for all plans combined:
 Pension BenefitsOPEB
2020201920202019
Prior service cost (credit)$35 $39 $(145)$(158)
Actuarial loss8,077 7,662 538 565 
Total$8,112 $7,701 $393 $407 
Total included in AOCI$4,339 $4,068 $183 $177 
Total included in regulatory assets (liabilities)$3,773 $3,633 $210 $230 
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation [Table Text Block]
For Exelon, the following assumptions were used to determine the benefit obligations for the plans at December 31, 2020 and 2019. Assumptions used to determine year-end benefit obligations are the assumptions used to estimate the subsequent year’s net periodic benefit costs.
 Pension BenefitsOPEB
2020 2019 2020 2019 
Discount rate2.58 %
(a) 
3.34 %
(a) 
2.51 %
(a) 
3.31 %
(a) 
Investment crediting rate3.72 %
(b) 
3.82 %
(b) 
N/AN/A
Rate of compensation increase3.75 %    
(c) 
3.75 %    
(c) 
Mortality tablePri-2012 table with MP- 2020 improvement scale (adjusted)Pri-2012 table with MP- 2019 improvement scale (adjusted)Pri-2012 table with MP- 2020 improvement scale (adjusted) Pri-2012 table with MP- 2019 improvement scale (adjusted)
Health care cost trend on covered chargesN/AN/A
Initial and ultimate rate of 5.00%
5.00% with
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 OPEB obligations. Certain benefit plans used individual rates, which range from 2.11% - 2.73% and 2.45% - 2.63% for pension and OPEB plans, respectively, as of December 31, 2020 and 3.02% - 3.44% and 3.27% - 3.40% for pension and OPEB plans, respectively, as of December 31, 2019.
(b)The investment crediting rate above represents a weighted average rate.
(c)3.25% through 2019 and 3.75% thereafter.
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 cost for Exelon for the years ended December 31, 2020, 2019 and 2018: 
 Pension Benefits OPEB 
2020 2019 2018 2020 2019 2018 
Discount rate3.34 %
(a) 
4.31 %
(a) 
3.62 %
(a) 
3.31 %
(a) 
4.30 %
(a) 
3.61 %
(a) 
Investment crediting rate3.82 %
(b) 
4.46 %
(b) 
4.00 %
(b) 
N/AN/AN/A
Expected return on plan assets7.00 %
(c) 
7.00 %
(c) 
7.00 %
(c) 
6.69 %
(c) 
6.67 %
(c) 
6.60 %
(c) 
Rate of compensation increase    
(d) 
(d) 
(d) 
    
(d) 
(d) 
(d) 
Mortality tablePri-2012 table with MP- 2019 improvement scale (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)Pri-2012 table with MP- 2019 improvement scale (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 chargesN/AN/AN/A
Initial and ultimate rate of 5.00%
5.00%
with
ultimate
trend of
5.00% in
2017
5.00%
with
ultimate
trend of
5.00% in
2017
__________
(a)The discount rates above represent the blended rates used to establish the majority of Exelon’s pension and OPEB costs. Certain benefit plans used individual rates, which range from 3.02%-3.44% and 3.27%-3.40% for pension and OPEB plans, respectively, for the year ended December 31, 2020; 4.13%-4.36% and 4.27%-4.38% for pension and OPEB plans; respectively, for the year ended December 31, 2019; and 3.49%-3.65% and 3.57%-3.68% for pension and OPEB plans, respectively, for the year ended December 31, 2018.
(b)The investment crediting rate above represents a weighted average rate.
(c)Not applicable to pension and OPEB plans that do not have plan assets.
(d)3.25% through 2019 and 3.75% thereafter.
Pension And Other Postretirement Benefit Contributions [Table Text Block] The following tables provide contributions to the pension and OPEB plans:
 Pension BenefitsOPEB
 2020201920182020 2019 2018
Exelon$542 $356 $337 $59 $51 $46 
Generation236 160 128 19 15 11 
ComEd143 72 38 5 5 4 
PECO18 27 28 — 1 — 
BGE56 34 40 22 14 14 
PHI30 10 62 9 15 12 
Pepco 2 2 6 9 12 11 
DPL — 1 — — — — 
ACE 2 — 6 — 1 — 
The following table provides all Registrants' planned contributions to the qualified pension plans, planned benefit payments to non-qualified pension plans, and planned contributions to OPEB plans in 2021:
Qualified Pension PlansNon-Qualified Pension PlansOPEB
Exelon$505 $51 $75 
Generation196 27 24 
ComEd170 2 23 
PECO14 1 — 
BGE57 1 16 
PHI29 9 7 
Pepco1 2 6 
DPL— 1 — 
ACE3 — — 
Schedule of Expected Benefit Payments [Table Text Block]
Estimated future benefit payments to participants in all of the pension plans and postretirement benefit plans at December 31, 2020 were:
Pension
Benefits		OPEB
2021$1,279 $257 
20221,280 259 
20231,315 261 
20241,325 262 
20251,338 265 
2026 through 20306,759 1,320 
Total estimated future benefit payments through 2030$13,296 $2,624 
Defined Benefit Plan Weighted Average Asset Allocations And Target Allocations [Table Text Block]
Exelon’s pension and OPEB plan target asset allocations at December 31, 2020 and 2019 were as follows:
December 31, 2020December 31, 2019
Asset CategoryPension BenefitsOPEBPension BenefitsOPEB
Equity securities34 %45 %33 %46 %
Fixed income securities43 %39 %44 %32 %
Alternative investments(a)
23 %16 %23 %22 %
Total100 %100 %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]
The following tables present pension and OPEB plan assets measured and recorded at fair value in Exelon's Consolidated Balance Sheets on a recurring basis and their level within the fair value hierarchy at December 31, 2020 and 2019:
December 31, 2020December 31, 2019
Level 1Level 2Level 3Not subject to levelingTotalLevel 1Level 2Level 3Not subject to levelingTotal
Pension plan assets(a)
Cash equivalents$408 $121 $— $— $529 $258 $107 $— $— $365 
Equities(b)
4,255 — 2 2,552 6,809 3,616 1 5 2,589 6,211 
Fixed income:
U.S. Treasury and agencies1,137 367 — — 1,504 1,294 280 — — 1,574 
State and municipal debt— 85 — — 85 — 56 — — 56 
Corporate debt(c)
— 4,873 573 — 5,446 — 4,390 245 — 4,635 
Other(b)
— 239 21 537 797 — 305 — 851 1,156 
Fixed income subtotal1,137 5,564 594 537 7,832 1,294 5,031 245 851 7,421 
Private equity— — — 1,632 1,632 — — — 1,391 1,391 
Hedge funds— — — 1,314 1,314 — — — 1,126 1,126 
Real estate— — — 1,080 1,080 — — — 1,030 1,030 
Private credit— — 234 1,046 1,280 — — 237 929 1,166 
Pension plan assets subtotal 5,800 5,685 830 8,161 20,476 5,168 5,139 487 7,916 18,710 
OPEB plan assets(a)
Cash equivalents50 52 — — 102 39 49 — — 88 
Equities618 2 — 569 1,189 473 5 — 719 1,197 
Fixed income:
U.S. Treasury and agencies16 66 — — 82 17 64 — — 81 
State and municipal debt— 89 — — 89 — 107 — — 107 
Corporate debt(c)
— 89 — — 89 — 71 — — 71 
Other285 3 — 179 467 258 5 — 201 464 
Fixed income subtotal301 247 — 179 727 275 247 — 201 723 
Hedge funds— — — 308 308 — — — 293 293 
Real estate— — — 111 111 — — — 109 109 
Private credit— — — 117 117 — — — 131 131 
OPEB plan assets subtotal969 301 — 1,284 2,554 787 301 — 1,453 2,541 
Total pension and OPEB plan assets(d)
$6,769 $5,986 $830 $9,445 $23,030 $5,955 $5,440 $487 $9,369 $21,251 
__________
(a)See Note 18—Fair Value of Financial Assets and Liabilities for a description of levels within the fair value hierarchy.
(b)Includes derivative instruments of $2 million for the years ended December 31, 2020 and 2019, which have total notional amounts of $6,879 million and $6,668 million at December 31, 2020 and 2019, 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.
(c)Includes investments in equities sold short held in investment vehicles primarily to hedge the equity option component of its convertible debt. Pension equities sold short totaled $(96) million and $(75) million as of December 31, 2020 and 2019, respectively. OPEB equities sold short totaled $(42) million and $(35) million as of December 31, 2020 and 2019, respectively.
(d)Excludes net liabilities of $132 million and $120 million at December 31, 2020 and 2019, respectively, which include certain derivative assets that have notional amounts of $239 million and $632 million at December 31, 2020 and 2019, respectively. These items are required to reconcile to the fair value of net plan assets and consist primarily of receivables or payables related to pending securities sales and purchases and 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 for Exelon measured at fair value for pension and OPEB plans for the years ended December 31, 2020 and 2019:
Fixed IncomeEquitiesPrivate
Credit		Total
Pension Assets
Balance as of January 1, 2020$245 $5 $237 $487 
Actual return on plan assets:
Relating to assets still held at the
reporting date		19 (3)15 31 
Purchases, sales and settlements:
Purchases34 — 24 58 
Settlements(a)
(3)— (42)(45)
Transfers into Level 3(b)
299 — — 299 
Balance as of December 31, 2020$594 $2 $234 $830 
Fixed IncomeEquitiesPrivate
Credit		Total
Pension Assets
Balance as of January 1, 2019$216 $2 $268 $486 
Actual return on plan assets:
Relating to assets still held at the
reporting date
28 3 28 59 
Relating to assets sold during the
period
(7)— — (7)
Purchases, sales and settlements:
Purchases26 — 41 67 
Sales(4)— — (4)
Settlements(a)
(2)— (100)(102)
Transfers out of Level 3(12)— — (12)
Balance as of December 31, 2019$245 $5 $237 $487 
__________
(a)Represents cash settlements only.
(b)In 2020, a contract was terminated for a certain fixed income commingled fund resulting in the ownership of certain fixed income securities which led to a transfer into Level 3 from not subject to leveling of $299 million.
Schedule Of Defined Contributions [Table Text Block]
The Registrants participate in various 401(k) defined contribution savings plans that are sponsored by Exelon. The plans are qualified under applicable sections of the IRC and allow employees to contribute a portion of their pre-tax and/or after-tax income in accordance with specified guidelines. All Registrants match a percentage of the employee contributions up to certain limits. The following table presents matching contributions to the savings plan for the years ended December 31, 2020, 2019, and 2018:
For the Years Ended December 31,ExelonGenerationComEdPECOBGEPHIPepcoDPLACE
2020$158 $63 $36 $12 $13 14 $4 $3 $3 
2019161 73 35 11 12 13 3 3 2 
2018179 86 37 9 12 13 3 2 2