Retirement Benefits (Tables)

9 Months Ended

Sep. 30, 2020

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 nine months ended September 30, 2020 and 2019.

	Pension Benefits				OPEB
	Three Months Ended September 30,				Three Months Ended September 30,
	2020		2019		2020		2019
Components of net periodic benefit cost:
Service cost	$	97	$	89	$	22	$	23
Interest cost	190		221		37		47
Expected return on assets	(317)		(306)		(41)		(38)
Amortization of:
Prior service cost (benefit)	1		—		(30)		(45)
Actuarial loss	128		104		12		11
Settlement charges	8		7		—		—
Contractual termination benefits	—		1		—		—
Net periodic benefit cost	$	107	$	116	$	—	$	(2)

	Pension Benefits				OPEB
	Nine Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Components of net periodic benefit cost:
Service cost	$	290	$	267	$	67	$	70
Interest cost	569		663		114		141
Expected return on assets	(953)		(918)		(122)		(115)
Amortization of:
Prior service cost (benefit)	3		—		(92)		(134)
Actuarial loss	384		310		36		34
Settlement charges	14		7		—		—
Contractual termination benefits	—		1		—		—
Net periodic benefit cost	$	307	$	330	$	3	$	(4)

Allocated Portion of Pension and Postretirement Benefit Costs

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 Costs	2020		2019		2020		2019
Exelon	$	107	$	114	$	310	$	326
Generation	30		37		89		100
ComEd	29		23		85		70
PECO	1		4		4		9
BGE	16		16		47		47
PHI	17		23		52		71
Pepco	4		6		11		19
DPL	2		4		6		11
ACE	3		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 Contributions	2020		2019		2020		2019
Exelon	$	37	$	36	$	104	$	101
Generation	14		14		41		41
ComEd	9		9		25		26
PECO	3		2		8		7
BGE	4		4		8		9
PHI	3		4		9		8
Pepco	1		1		3		2
DPL	1		1		2		2
ACE	—		1		1		1