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Retirement Benefits (All Registrants)
 9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Retirement Benefits (All Registrants) Retirement Benefits (All Registrants)
Defined Benefit Pension and OPEB
During the first quarter of 2021, Exelon received an updated valuation of its pension and OPEB to reflect actual census data as of January 1, 2021. This valuation resulted in an increase to the pension obligations of $33 million and a decrease to the OPEB obligations of $9 million. Additionally, accumulated other comprehensive loss
increased by $1 million (after-tax) and regulatory assets and liabilities increased by $21 million and $1 million, respectively.
The majority of the 2021 pension benefit cost for the Exelon-sponsored plans is calculated using an expected long-term rate of return on plan assets of 7.00% and a discount rate of 2.58%. The majority of the 2021 OPEB cost is calculated using an expected long-term rate of return on plan assets of 6.46% for funded plans and a discount rate of 2.51%.
A portion of the net periodic benefit cost for all plans is capitalized in 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, 2021 and 2020.
Pension BenefitsOPEB
Three Months Ended September 30,Three Months Ended September 30,
 2021202020212020
Components of net periodic benefit cost:
Service cost$110 $97 $20 $22 
Interest cost161 190 29 37 
Expected return on assets(335)(317)(40)(41)
Amortization of:
Prior service cost (credit)1 1 (8)(30)
Actuarial loss150 128 9 12 
Settlement charges12 8 — — 
Net periodic benefit cost$99 $107 $10 $— 

Pension BenefitsOPEB
Nine Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Components of net periodic benefit cost:
Service cost$330 $290 $60 $67 
Interest cost481 569 86 114 
Expected return on assets(1,003)(953)(119)(122)
Amortization of:
Prior service cost (credit)3 3 (25)(92)
Actuarial loss449 384 27 36 
Curtailment benefits— — (1)— 
Settlement charges16 14 — — 
Net periodic benefit cost$276 $307 $28 $3 
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.
 Three Months Ended September 30,Nine Months Ended September 30,
Pension and OPEB Costs2021202020212020
Exelon$109 $107 $304 $310 
Generation36 30 92 89 
ComEd32 29 97 85 
PECO2 1 5 4 
BGE16 16 47 47 
PHI12 17 36 52 
Pepco2 4 5 11 
DPL1 2 2 6 
ACE3 3 8 10 

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 for the three and nine months ended September 30, 2021 and 2020, respectively.
Three Months Ended September 30,Nine Months Ended September 30,
Savings Plans Matching Contributions2021202020212020
Exelon$38 $37 $107 $104 
Generation14 14 40 41 
ComEd9 9 27 25 
PECO2 3 8 8 
BGE4 4 8 8 
PHI5 3 12 9 
Pepco1 1 3 3 
DPL1 1 3 2 
ACE1 — 2 1