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Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
The following table presents the components of Exelon's net periodic benefit costs, prior to capitalization, for the three months ended March 31, 2019 and 2018.
 
Pension Benefits
Three Months Ended March 31,
 
Other Postretirement Benefits
Three Months Ended March 31,
 
2019
 
2018
 
2019
 
2018
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
89

 
$
101

 
$
24

 
$
28

Interest cost
221

 
201

 
47

 
43

Expected return on assets
(307
)
 
(312
)
 
(38
)
 
(43
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost (benefit)
—

 
—

 
(45
)
 
(46
)
Actuarial loss
104

 
157

 
11

 
16

Net periodic benefit cost
$
107

 
$
147

 
$
(1
)
 
$
(2
)

 
 
 
 
Schedule Of Pension And Other Postretirement Benefit Costs
The amounts below represent Exelon's, Generation's, ComEd's, PECO's, BGE's, PHI's, Pepco's, DPL's, and ACE's pension and postretirement benefit plan costs. For Exelon, the service cost component is included in Operating and maintenance expense and Property, plant and equipment, net, for the three months ended March 31, 2019 and 2018, while the non-service cost components are included in Other, net and Regulatory assets for the three months ended March 31, 2019 and 2018. For the Registrants other than Exelon, 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 three months ended March 31, 2019 and 2018.
 
 
Three Months Ended
March 31,
Pension and Other Postretirement Benefit Costs
 
2019
 
2018
Exelon
 
$
106

 
$
145

Generation
 
31

 
51

ComEd
 
24

 
45

PECO
 
2

 
5

BGE
 
16

 
15

PHI
 
23

 
15

Pepco
 
6

 
4

DPL
 
4

 
—

ACE
 
4

 
3
Schedule Of Defined Contributions
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 months ended March 31, 2019 and 2018, respectively.
 
 
Three Months Ended
March 31,
Savings Plan Matching Contributions
 
2019
 
2018
Exelon
 
$
31


$
32

Generation
 
13

 
15

ComEd
 
7

 
7

PECO
 
2

 
2

BGE
 
2

 
2

PHI
 
4

 
3

Pepco
 
1

 
1

DPL
 
1

 
1

ACE
 
1

 
—