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Retirement Benefits (All Registrants)
 9 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Retirement Benefits (All Registrants) Retirement Benefits (All Registrants)
Defined Benefit Pension and OPEB
During the first quarter of 2020, Exelon received an updated valuation of its pension and OPEB to reflect actual census data as of January 1, 2020. This valuation resulted in an increase to the pension and OPEB obligations of $8 million and $31 million, respectively. Additionally, accumulated other comprehensive loss increased by $7 million (after-tax) and regulatory assets and liabilities increased by $19 million and decreased by $10 million, respectively.
The majority of the 2020 pension benefit cost for Exelon-sponsored plans is calculated using an expected long-term rate of return on plan assets of 7.00% and a discount rate of 3.34%. The majority of the 2020 OPEB cost is calculated using an expected long-term rate of return on plan assets of 6.69% for funded plans and a discount rate of 3.31%.
A portion of the net periodic benefit cost for all plans is capitalized within the Consolidated Balance Sheets. The following table presents the components of Exelon's net periodic benefit costs, prior to capitalization, for the three and nine months ended September 30, 2020 and 2019.
Pension BenefitsOPEB
Three Months Ended September 30,Three Months Ended September 30,
 2020201920202019
Components of net periodic benefit cost:
Service cost$97 $89 $22 $23 
Interest cost190 221 37 47 
Expected return on assets(317)(306)(41)(38)
Amortization of:
Prior service cost (benefit)1 — (30)(45)
Actuarial loss128 104 12 11 
Settlement charges8 7 — — 
Contractual termination benefits— 1 — — 
Net periodic benefit cost$107 $116 $— $(2)
Pension BenefitsOPEB
Nine Months Ended September 30,Nine Months Ended September 30,
2020201920202019
Components of net periodic benefit cost:
Service cost$290 $267 $67 $70 
Interest cost569 663 114 141 
Expected return on assets(953)(918)(122)(115)
Amortization of:
Prior service cost (benefit)3 — (92)(134)
Actuarial loss384 310 36 34 
Settlement charges14 7 — — 
Contractual termination benefits— 1 — — 
Net periodic benefit cost$307 $330 $3 $(4)
The amounts below represent the Registrants' allocated pension and OPEB plan 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.
 Three Months Ended September 30,Nine Months Ended September 30,
Pension and OPEB Costs2020201920202019
Exelon$107 $114 $310 $326 
Generation30 37 89 100 
ComEd29 23 85 70 
PECO1 4 4 9 
BGE16 16 47 47 
PHI17 23 52 71 
Pepco4 6 11 19 
DPL2 4 6 11 
ACE3 4 10 12 
Defined Contribution Savings Plans
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 the matching contributions to the savings plans during the three and nine months ended September 30, 2020 and 2019, respectively.
Three Months Ended September 30,Nine Months Ended September 30,
Savings Plan Matching Contributions2020201920202019
Exelon$37 $36 $104 $101 
Generation14 14 41 41 
ComEd9 9 25 26 
PECO3 2 8 7 
BGE4 4 8 9 
PHI3 4 9 8 
Pepco1 1 3 2 
DPL1 1 2 2 
ACE— 1 1 1