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Retirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
The following tables present the components of Exelon's net periodic benefit costs, prior to capitalization, for the three and six months ended June 30, 2017 and 2016 and PHI's net periodic benefit costs, prior to capitalization, for the predecessor period of January 1, 2016 to March 23, 2016.
 
Pension Benefits
Three Months Ended June 30,
 
Other Postretirement Benefits
Three Months Ended June 30,
 
2017(a)
 
2016(b)
 
2017(a)
 
2016(b)
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
97

 
$
91

 
$
28

 
$
28

Interest cost
211

 
212

 
46

 
48

Expected return on assets
(299
)
 
(292
)
 
(41
)
 
(42
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost (benefit)
1

 
4

 
(47
)
 
(47
)
Actuarial loss
150

 
142

 
15

 
16

Settlement charges
2

 
—

 
—

 
—

Net periodic benefit cost
$
162

 
$
157

 
$
1

 
$
3

 
Pension Benefits
Six Months Ended June 30,
 
Other Postretirement Benefits
Six Months Ended June 30,
 
2017(a)
 
2016(b)
 
2017(a)
 
2016(b)
Components of net periodic benefit cost:


 


 


 


Service cost
$
191

 
$
170

 
$
54

 
$
54

Interest cost
422

 
403

 
91

 
90

Expected return on assets
(598
)
 
(555
)
 
(82
)
 
(80
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost (benefit)
1

 
7

 
(94
)
 
(91
)
Actuarial loss
302

 
269

 
31

 
30

Settlement charges
2

 
—

 
—

 
—

Net periodic benefit cost
$
320


$
294


$
—


$
3

_______
(a)
FitzPatrick net benefit costs are included for the period after acquisition.
(b)
PHI net periodic benefit costs for the period prior to the merger are not included in the table above.

 
Predecessor
 
PHI
 
Pension Benefits
 
Other Postretirement Benefits
 
January 1, 2016 to March 23, 2016
 
January 1, 2016 to March 23, 2016
Components of net periodic benefit cost:
 
 
 
Service cost
$
12

 
$
1

Interest cost
26

 
6

Expected return on assets
(30
)
 
(5
)
Amortization of:
 
 
 
Prior service cost (benefit)
—

 
(3
)
Actuarial loss
14

 
2

Net periodic benefit cost
$
22

 
$
1
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, ACE's, BSC's and PHISCO's allocated portion of the pension and postretirement benefit plan costs, which were included in Property, plant and equipment within the respective Consolidated Balance Sheets and Operating and maintenance expense within the Consolidated Statement of Operations and Comprehensive Income during the three and six months ended June 30, 2017 and 2016 and PHI's for the predecessor and successor periods of January 1, 2016 to March 23, 2016 and March 24, 2016 to June 30, 2016, respectively.

 
Three Months Ended June 30,
 
Six Months Ended June 30,
Pension and Other Postretirement Benefit Costs
2017
 
2016
 
2017
 
2016
Exelon
$
163

 
$
160

 
$
320

 
$
297

Generation(c)
59

 
55

 
113

 
109

ComEd
44

 
42

 
87

 
83

PECO
7

 
8

 
14

 
17

BGE
16

 
18

 
32

 
33

BSC(a)
13

 
10

 
26

 
24

Pepco(b)
6

 
7

 
13

 
16

DPL(b)
3

 
4

 
6

 
9

ACE(b)
3

 
4

 
7

 
8

PHISCO(a)(b)
12

 
12

 
22

 
21

 
Successor
 
 
Predecessor
Pension and Other Postretirement Benefit Costs
Three Months Ended June 30, 2017
 
Three Months Ended June 30, 2016
 
Six Months Ended June 30, 2017
 
March 24, 2016 to June 30, 2016
 
 
January 1, 2016 to March 23, 2016
PHI
$
24

 
$
27

 
$
48

 
$
31

 
 
$
23

(a)
These amounts primarily represent amounts billed to Exelon’s subsidiaries through intercompany allocations. These amounts are not included in the Generation, ComEd, PECO, BGE, PHI, Pepco, DPL or ACE amounts above.
(b)
Pepco's, DPL's, ACE's and PHISCO's pension and postretirement benefit costs for the six months ended June 30, 2016 include $7 million, $4 million, $3 million and $9 million, respectively, of costs incurred prior to the closing of Exelon’s merger with PHI on March 23, 2016.
Schedule Of Defined Contributions
The following table presents the matching contributions to the savings plans during the three and six months ended June 30, 2017 and 2016 and PHI's for the predecessor and successor periods of January 1, 2016 to March 23, 2016 and March 24, 2016 to June 30, 2016, respectively.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
Savings Plan Matching Contributions
2017
 
2016
 
2017
 
2016
Exelon
$
33


$
30


$
63


$
56

Generation
14

 
13

 
28

 
25

ComEd
8

 
7

 
15

 
13

PECO
2

 
2

 
4

 
4

BGE
3

 
2

 
4

 
3

BSC(a)
3

 
2

 
5

 
7

Pepco(b)
1

 
1

 
2

 
2

DPL(b)
1

 
—

 
1

 
1

PHISCO(a)(b)
1

 
2

 
3

 
3

ACE
—

 
1

 
1

 
1


 
Successor
 
 
Predecessor
Savings Plan Matching Contributions
Three Months Ended June 30, 2017
 
Three Months Ended June 30, 2016
 
Six Months Ended June 30, 2017
 
March 24, 2016 to June 30, 2016
 
 
January 1, 2016 to March 23, 2016
PHI
$
3

 
$
4

 
$
7

 
$
4

 
 
$
3

_________ 
(a)
These amounts primarily represent amounts billed to Exelon and PHI's subsidiaries through intercompany allocations. These costs are not included in the Generation, ComEd, PECO, BGE, Pepco and DPL amounts above.
(b)
Pepco's, DPL's and PHISCO's matching contributions for the six months ended June 30, 2016 include $1 million, $1 million and $1 million, respectively, of costs incurred prior to the closing of Exelon’s merger with PHI on March 23, 2016, which is not included in Exelon’s matching contributions for the six months ended June 30, 2016.