Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 2022

Retirement Benefits [Abstract]

Calculation of Net Periodic Benefit Costs

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 six months ended June 30, 2022 and 2021.

	Pension Benefits				OPEB
	Three Months Ended June 30,				Three Months Ended June 30,
	2022		2021		2022		2021
Components of net periodic benefit cost:
Service cost	$	58	$	75	$	10	$	13
Interest cost	110		101		19		17
Expected return on assets	(205)		(210)		(25)		(25)
Amortization of:
Prior service cost (credit)	1		—		(5)		(7)
Actuarial loss	73		99		4		8
Net periodic benefit cost	$	37	$	65	$	3	$	6
	Pension Benefits				OPEB
	Six Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Components of net periodic benefit cost:
Service cost	$	119	$	148	$	20	$	26
Interest cost	220		202		38		35
Expected return on assets	(414)		(421)		(50)		(50)
Amortization of:
Prior service cost (credit)	2		1		(10)		(13)
Actuarial loss	149		199		8		14
Curtailment benefits	—		—		—		(1)
Net periodic benefit cost	$	76	$	129	$	6	$	11

Allocated Portion of Pension and Postretirement Benefit Costs

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 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 June 30,				Six Months Ended June 30,
Pension and OPEB Costs (Benefit)	2022		2021		2022		2021
Exelon	$	40	$	71	$	82	$	140
ComEd	14		32		30		64
PECO	(2)		2		(4)		4
BGE	11		16		22		31
PHI	13		12		26		24
Pepco	2		2		4		3
DPL	1		1		2		1
ACE	3		3		6		5

Defined Contribution Savings Plans

The Registrants participate in a 401(k) defined contribution savings plan that is sponsored by Exelon. The plan is 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 employer contributions and employer matching contributions to the savings plan for the three and six months ended June 30, 2022 and 2021, respectively.

	Three Months Ended June 30,				Six Months Ended June 30,
Savings Plan Matching Contributions	2022		2021		2022		2021
Exelon	$	23	$	23	$	43	$	43
ComEd	10		10		18		18
PECO	3		3		6		6
BGE	3		2		5		4
PHI	4		4		7		7
Pepco	1		1		2		2
DPL	1		1		2		2
ACE	1		1		1		1