Retirement Benefits (Tables)

3 Months Ended

Mar. 31, 2017

Compensation and Retirement Disclosure [Abstract]

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 months ended March 31, 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 March 31, 2016, respectively.

	Three Months Ended March 31,
Pension and Other Postretirement Benefit Costs	2017		2016
Exelon	$	157	$	136
Generation	54		54
ComEd	44		41
PECO	7		8
BGE	16		16
BSC(a)	12		14
Pepco(b)	7		8
DPL(b)	3		5
ACE(b)	3		4
PHISCO(a)(b)	11		9

	Successor		Predecessor
Pension and Other Postretirement Benefit Costs	March 24, 2016 to March 31, 2016		January 1, 2016 to March 23, 2016
PHI	$	3	$	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.

Schedule Of Defined Contributions

The following table presents the matching contributions to the savings plans during the three months ended March 31, 2017 and 2016:

	Three Months Ended March 31,
Savings Plan Matching Contributions	2017		2016
Exelon	$	30	$	26
Generation	14		12
ComEd	7		6
PECO	2		2
BGE	2		1
BSC(a)	2		5
Pepco(b)	1		1
DPL(b)	1		1
PHISCO(a)(b)	1		1

	Successor		Predecessor
Savings Plan Matching Contributions	March 24, 2016 to March 31, 2016		January 1, 2016 to March 23, 2016
PHI	$	—	$	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 three months ended March 31, 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 three months ended March 31, 2016.

Schedule of Net Benefit Costs [Table Text Block]

	Pension Benefits Three Months Ended March 31,						Other Postretirement Benefits Three Months Ended March 31,
	2017			2016(a)			2017			2016(a)
Components of net periodic benefit cost:
Service cost	$	95		$	78		$	26		$	26
Interest cost	210			190			45			43
Expected return on assets	(299		)	(263		)	(41		)	(38		)
Amortization of:
Prior service cost (benefit)	—			3			(47		)	(44		)
Actuarial loss	152			127			16			14
Net periodic benefit cost	$	158		$	135		$	(1	)	$	1

_______

(a) 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