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Retirement Benefits (Tables)
 9 Months Ended
Sep. 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 nine months ended September 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 September 30,
 
Other Postretirement Benefits
Three Months Ended September 30,
 
2017(a)
 
2016(b)
 
2017(a)
 
2016(b)
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
98

 
$
92

 
$
26

 
$
27

Interest cost
211

 
215

 
45

 
47

Expected return on assets
(300
)
 
(293
)
 
(39
)
 
(42
)
Amortization of:
 
 
 
 
 
 
 
Prior service (benefit) cost
(1
)
 
3

 
(47
)
 
(48
)
Actuarial loss
152

 
142

 
15

 
18

Settlement charges
1

 
—

 
—

 
—

Net periodic benefit cost
$
161

 
$
159

 
$
—

 
$
2

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


 


 


 


Service cost
$
290

 
$
262

 
$
79

 
$
80

Interest cost
632

 
616

 
136

 
138

Expected return on assets
(898
)
 
(847
)
 
(121
)
 
(121
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost (benefit)
—

 
10

 
(140
)
 
(138
)
Actuarial loss
455

 
411

 
46

 
47

Settlement charges
3

 
—

 
—

 
—

Net periodic benefit cost
$
482


$
452


$
—


$
6

_________
(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 nine months ended September 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 September 30, 2016, respectively.
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
Pension and Other Postretirement Benefit Costs
2017
 
2016
 
2017
 
2016
Exelon
$
161

 
$
161

 
$
482

 
$
458

Generation(a)
57

 
54

 
170

 
163

ComEd
44

 
41

 
131

 
124

PECO
7

 
8

 
21

 
25

BGE
16

 
17

 
48

 
51

BSC(b)
13

 
13

 
40

 
37

Pepco(c)
6

 
8

 
19

 
24

DPL(c)
3

 
4

 
10

 
13

ACE(c)
3

 
4

 
10

 
11

PHISCO(c)(d)
12

 
12

 
33

 
33

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

 
$
28

 
$
72

 
$
58

 
 
$
23


_________
(a)
FitzPatrick net benefit costs are included for the period after acquisition.
(b)
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.
(c)
Pepco's, DPL's, ACE's and PHISCO's pension and postretirement benefit costs for the nine months ended September 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.
(d)
These amounts represent amounts billed to Pepco, DPL, and ACE through intercompany allocations. These amounts are not included in Pepco, DPL, or ACE amounts above.
Schedule Of Defined Contributions
The following table presents the matching contributions to the savings plans during the three and nine months ended September 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 September 30, 2016, respectively.
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
Savings Plan Matching Contributions
2017
 
2016
 
2017
 
2016
Exelon
$
34


$
51


$
97


$
107

Generation
14

 
31

 
42

 
56

ComEd
9

 
10

 
24

 
23

PECO
3

 
3

 
7

 
7

BGE
3

 
2

 
7

 
5

BSC(a)
2

 
2

 
7

 
9

Pepco(b)
1

 
—

 
3

 
2

DPL(b)
1

 
1

 
2

 
2

ACE
—

 
—

 
1

 
1

PHISCO(b)(c)
1

 
2

 
4

 
5

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

 
$
3

 
$
10

 
$
7

 
 
$
3

_________ 
(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 and PHISCO's matching contributions for the nine months ended September 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 nine months ended September 30, 2016.
(c)
These amounts represent amounts billed to Pepco, DPL, and ACE through intercompany allocations. These amounts are not included in Pepco, DPL, or ACE amounts above.