Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule Of Pension And Other Postretirement Participation

	Operating Company(d)
Name of Plan:	Generation	ComEd	PECO	BGE	BSC
Qualified Pension Plans:
Exelon Corporation Retirement Program(a)	X	X	X	X	X
Exelon Corporation Cash Balance Pension Plan(a)	X	X	X	X	X
Exelon Corporation Pension Plan for Bargaining Unit Employees(a)	X	X			X
Exelon New England Union Employees Pension Plan(a)	X
Exelon Employee Pension Plan for Clinton, TMI and Oyster Creek(a)	X	X	X		X
Pension Plan of Constellation Energy Group, Inc.(b)	X	X	X	X	X
Pension Plan of Constellation Energy Nuclear    Group, LLC(c)	X			X	X
Nine Mile Point Pension Plan(c)	X				X
Constellation Mystic Power, LLC Union Employees Pension Plan Including Plan A and Plan B(b)	X
Non-Qualified Pension Plans:
Exelon Corporation Supplemental Pension Benefit Plan and 2000 Excess Benefit Plan(a)	X	X	X		X
Exelon Corporation Supplemental Management Retirement Plan(a)	X	X	X	X	X
Constellation Energy Group, Inc. Senior Executive Supplemental Plan(b)	X			X	X
Constellation Energy Group, Inc. Supplemental Pension Plan(b)	X			X	X
Constellation Energy Group, Inc. Benefits Restoration Plan(b)	X	X		X	X
Constellation Nuclear Plan, LLC Executive    Retirement Plan(c)	X				X
Constellation Energy Nuclear Plan, LLC Benefits    Restoration Plan(c)	X				X
Baltimore Gas & Electric Company Executive Benefit Plan(b)	X			X	X
Baltimore Gas & Electric Company Manager Benefit Plan(b)	X	X		X	X

	Operating Company(d)
Name of Plan:	Generation	ComEd	PECO	BGE	BSC
Other Postretirement Benefit Plans:
PECO Energy Company Retiree Medical Plan(a)	X	X	X	X	X
Exelon Corporation Health Care Program(a)	X	X	X	X	X
Exelon Corporation Employees’ Life Insurance Plan(a)	X	X	X	X	X
Constellation Energy Group, Inc. Retiree Medical Plan(b)	X	X	X	X	X
Constellation Energy Group, Inc. Retiree Dental Plan(b)	X			X	X
Constellation Energy Group, Inc. Employee Life Insurance Plan and Family Life Insurance Plan(b)	X	X	X	X	X
Constellation Mystic Power, LLC Post-Employment Medical Account Savings Plan(b)	X
Exelon New England Union Post-Employment Medical Savings Account Plan(a)	X
Retiree Medical Plan of Constellation Energy    Nuclear Group LLC(c)	X			X	X
Retiree Dental Plan of Constellation Energy    Nuclear Group LLC(c)	X			X	X
Nine Mile Point Nuclear Station, LLC Medical Care    and Prescription Drug Plan for Retired    Employees(c)	X				X

______________________

(a) These plans are collectively referred to as the Legacy Exelon plans.

(b) These plans are collectively referred to as the Legacy Constellation Energy Group (CEG) Plans.

(c) These plans are collectively referred to as the Legacy CENG plans.

(d) Employees generally remain in their legacy benefit plans when transferring between operating companies.

Defined Benefit Plan Change In Benefit Obligation RollForward

The following table provides a rollforward of the changes in the benefit obligations and plan assets for the most recent two years for all plans combined:

	Pension Benefits						Other Postretirement Benefits
	2015			2014			2015			2014
Change in benefit obligation:
Net benefit obligation at beginning of year	$	18,256		$	15,459		$	4,197		$	4,451
Service cost	326			293			119			117
Interest cost	710			749			167			186
Plan participants’ contributions	—			—			42			42
Actuarial (gain) loss	(582		)	2,095			(341		)	502
Plan amendments	—			—			(23		)	(1,012		)
Acquisitions/divestitures(a)	—			594			—			142
Curtailments	—			(8		)	—			—
Settlements	(34		)	(30		)	—			—
Gross benefits paid	(923		)	(896		)	(223		)	(231		)
Net benefit obligation at end of year	$	17,753		$	18,256		$	3,938		$	4,197

	Pension Benefits						Other Postretirement Benefits
	2015			2014			2015			2014
Change in plan assets:
Fair value of net plan assets at beginning of year	$	14,874		$	13,571		$	2,430		$	2,238
Actual return on plan assets	(32		)	1,443			4			90
Employer contributions	462			332			40			291
Plan participants’ contributions	—			—			42			42
Gross benefits paid	(923		)	(896		)	(223		)	(231		)
Acquisitions/divestitures(a)	—			454			—			—
Settlements	(34		)	(30		)	—			—
Fair value of net plan assets at end of year	$	14,347		$	14,874		$	2,293		$	2,430

_______________________ 

(a) On April 1, 2014, Generation assumed operational control of CENG’s nuclear fleet.  As a result, Exelon became a sponsor of CENG’s pension and OPEB plans effective July 14, 2014.  See Note 5 - Investment in Constellation Energy Nuclear Group, LLC for further information.

Schedule of Amounts Recognized in Balance Sheet

Exelon presents its benefit obligations and plan assets net on its balance sheet within the following line items:

	Pension Benefits				Other Postretirement Benefits
	2015		2014		2015		2014
Other current liabilities	$	21	$	16	$	27	$	25
Pension obligations	3,385		3,366		—		—
Non-pension postretirement benefit obligations	—		—		1,618		1,742
Unfunded status (net benefit obligation less net plan assets)	$	3,406	$	3,382	$	1,645	$	1,767

Defined Benefit Plan Pension Plans With Projected Benefit Obligations And Accumulated Benefit Obligations In Excess Of Plan Assets

The following tables provide the projected benefit obligations (PBO), accumulated benefit obligation (ABO), and fair value of plan assets for all pension plans with a PBO or ABO in excess of plan assets.

	PBO in excess of plan assets
	2015		2014
Projected benefit obligation	$	17,753	$	18,256
Fair value of net plan assets	14,347		14,874

	ABO in excess of plan assets
	2015		2014
Projected benefit obligation	$	17,753	$	18,256
Accumulated benefit obligation	16,792		17,191
Fair value of net plan assets	14,347		14,874

Schedule of Defined Benefit Plans Disclosures

A portion of the net periodic benefit cost for all pension and OPEB plans are capitalized within each of the Registrant's Consolidated Balance Sheets. The following table presents the components of Exelon’s net periodic benefit costs, prior to any capitalization, for the years ended December 31, 2015, 2014 and 2013.

	Pension Benefits									Other Postretirement Benefits
	2015			2014			2013			2015			2014			2013
Components of net periodic benefit cost:
Service cost	$	326		$	293		$	317		$	119		$	117		$	162
Interest cost	710			749			650			167			186			194
Expected return on assets	(1,026		)	(994		)	(1,015		)	(151		)	(154		)	(132		)
Amortization of:
Prior service cost (credit)	13			14			14			(174		)	(122		)	(19		)
Actuarial loss	571			420			562			80			50			83
Settlement charges	2			2			9			—			—			—
Net periodic benefit cost	$	596		$	484		$	537		$	41		$	77		$	288

Changes In Plan Assets And Benefit Obligations Recognized In OCI And Regulatory Assets

The following tables provide the components of AOCI and regulatory assets (liabilities) for the years ended December 31, 2015, 2014 and 2013 for all plans combined.

	Pension Benefits									Other Postretirement Benefits
	2015			2014			2013			2015			2014			2013
Changes in plan assets and benefit obligations recognized in AOCI and regulatory assets (liabilities):
Current year actuarial loss (gain)	$	476		$	1,639		$	(1,169	)	$	(194	)	$	561		$	(628	)
Amortization of actuarial loss	(571		)	(420		)	(562		)	(80		)	(50		)	(83		)
Current year prior service (credit) cost	—			—			—			(23		)	(1,012		)	15
Amortization of prior service (cost) credit	(13		)	(14		)	(14		)	174			122			19
Settlements	(2		)	(2		)	(8		)	—			—			—
Total recognized in AOCI and regulatory assets (liabilities)(a)	$	(110	)	$	1,203		$	(1,753	)	$	(123	)	$	(379	)	$	(677	)

______________________

(a) Of the $110 million gain related to pension benefits, $64 million and $46 million were recognized in AOCI and regulatory assets, respectively, during 2015. Of the $123 million gain related to other postretirement benefits, $63 million and $60 million were recognized in AOCI and regulatory assets (liabilities), respectively, during 2015. Of the $1,203 million loss related to pension benefits, $788 million and $415 million were recognized in AOCI and regulatory assets, respectively, during 2014. Of the $379 million gain related to other postretirement benefits, $162 million and $217 million were recognized in AOCI and regulatory assets (liabilities), respectively, during 2014. Of the $1,753 million gain related to pension benefits, $1,071 million and $682 million were recognized in AOCI and regulatory assets, respectively, during 2013. Of the $677 million gain related to other postretirement benefits, $352 million and $325 million were recognized in AOCI and regulatory assets, respectively, during 2013.

Changes In Plan Assets And Benefit Obligations Not Recognized In OCI And Regulatory Assets

The following table provides the components of Exelon’s gross accumulated other comprehensive loss and regulatory assets (liabilities) that have not been recognized as components of periodic benefit cost at December 31, 2015 and 2014, respectively, for all plans combined:

	Pension Benefits				Other Postretirement Benefits
	2015		2014		2015			2014
Prior service cost (credit)	$	36	$	49	$	(812	)	$	(963	)
Actuarial loss	7,310		7,407		711			985
Total(a)	$	7,346	$	7,456	$	(101	)	$	22

_______________________

(a) Of the $7,346 million related to pension benefits, $4,246 million and $3,100 million are included in AOCI and regulatory assets, respectively, at December 31, 2015. Of the $(101) million related to other postretirement benefits, $(63) million and $(38) million are included in AOCI and regulatory assets (liabilities), respectively, at December 31, 2015. Of the $7,456 million related to pension benefits, $4,310 million and $3,146 million are included in AOCI and regulatory assets, respectively, at December 31, 2014. The $22 million related to other postretirement benefits is included in regulatory assets (liabilities) at December 31, 2014.

Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss And Regulatory Assets In Next Fiscal Year

The valuation is expected to be completed in the first quarter of 2016 for the majority of the benefit plans.

	Pension Benefits		Other Postretirement Benefits
Prior service cost (credit)	$	13	$	(175	)
Actuarial loss	501		50
Total(a)	$	514	$	(125	)

___________________ 

(a) Of the $514 million related to pension benefits at December 31, 2015, $290 million and $224 million are expected to be amortized from AOCI and regulatory assets in 2016, respectively. Of the $(125) million related to other postretirement benefits at December 31, 2015, $(64) million and $(61) million are expected to be amortized from AOCI and regulatory assets (liabilities) in 2016, respectively.

Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation

The following assumptions were used to determine the benefit obligations for the plans at December 31, 2015, 2014 and 2013. Assumptions used to determine year-end benefit obligations are the assumptions used to estimate the subsequent year’s net periodic benefit costs.

	Pension Benefits									Other Postretirement Benefits
	2015			2014			2013			2015			2014			2013
Discount rate	4.29	%		3.94	%		4.80	%		4.29	%		3.92	%		4.90	%
Rate of    compensation        increase			(a)			(a)			(b)			(a)			(a)			(b)
Mortality table	RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted)			RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted)			RP-2000 table with Scale AA improvements			RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted)			RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted)			RP-2000 table with Scale AA improvements
Health care cost    trend on covered       charges	N/A			N/A			N/A			5.50% decreasing to ultimate trend of 5.00% in 2017			6.00% decreasing to ultimate trend of 5.00% in 2017			6.00% decreasing to ultimate trend of 5.00% in 2017

_____________________________

(a) 3.25% through 2019 and 3.75% thereafter.

(b) 3.25% through 2018 and 3.75% thereafter.

Defined Benefit Plan Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost

The following assumptions were used to determine the net periodic benefit costs for all the plans for the years ended December 31, 2015, 2014 and 2013:

	Pension Benefits									Other Postretirement Benefits
	2015			2014			2013			2015			2014			2013
Discount rate	3.94	%	(a)	4.80	%	(b)	3.92	%	(c)	3.92	%	(a)	4.90	%	(b)	4.00	%	(c)
Expected return on plan assets	7.00	%	(d)	7.00	%	(d)	7.50	%	(d)	6.50	%	(d)	6.59	%	(d)	6.45	%	(d)
Rate of    compensation        increase			(e)			(f)			(g)			(e)			(f)			(g)
Mortality table	RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted)			RP-2000 table with Scale AA improvements			RP-2000 table with Scale AA improvements			RP-2000 table projected to 2012 with improvement scale AA, with Scale BB-2D improvements (adjusted)			RP-2000 table with Scale AA improvements			RP-2000 table with Scale AA improvements
Health care cost trend on covered    charges	N/A			N/A			N/A			6.00% decreasing to ultimate trend of 5.00% in 2017			6.00% decreasing to ultimate trend of 5.00% in 2017			6.50% decreasing to ultimate trend of 5.00% in 2017

___________________________

(a) The discount rates above represent the initial discount rates used to establish the majority of Exelon’s pension and other postretirement benefits costs for the year ended December 31, 2015. Discount rates for CENG's legacy pension and OPEB plans ranged from 3.68%-4.14% and 4.32%-4.43%, respectively.

(b) The discount rates above represent the initial discount rates used to establish the majority of Exelon's pension and other postretirement benefits costs for the year ended December 31, 2014. Certain of the other postretirement benefit plans were remeasured as of April 30, 2014 using an expected long-term rate of return on plan assets of 6.59% and a discount rate of 4.30%. Costs of the year ended December 31, 2014 reflect the impact of this remeasurement. On April 1, 2014, Generation assumed operational control of CENG’s nuclear fleet.  As a result, Exelon became the sponsor of CENG’s legacy pension and OPEB plans effective July 14, 2014; discount rates for those plans, impacting 2014 costs, ranged from 3.60%-4.30% and 4.09%-4.55%, respectively. See Note 5 - Investment in Constellation Energy Nuclear Group, LLC for further information.

(c) The discount rates above represent the initial discounts rates used to establish Exelon’s pension and other postretirement benefits costs for the year ended December 31, 2013. Certain of the benefit plans were remeasured during the year using discount rates of 4.21% and 4.66% for pension and other postretirement benefits, respectively. Costs for the year ended December 31, 2013 reflect the impact of these remeasurements.

(d) Not applicable to pension and other postretirement benefit plans that do not have plan assets.

(e) 3.25% through 2019 and 3.75% thereafter.

(f) 3.25% through 2018 and 3.75% thereafter.

(g) 3.25% through 2017 and 3.75% thereafter.

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates

A one percentage point change in assumed health care cost trend rates would have the following effects:

Effect of a one percentage point increase in assumed health care cost trend:
on 2015 total service and interest cost components	$	12
on postretirement benefit obligation at December 31, 2015	100
Effect of a one percentage point decrease in assumed health care cost trend:
on 2015 total service and interest cost components	(9		)
on postretirement benefit obligation at December 31, 2015	(89		)

Pension And Other Postretirement Benefit Contributions

The following table provides contributions made by Generation, ComEd, PECO, BGE and BSC to the pension and other postretirement benefit plans:

	Pension Benefits						Other Postretirement Benefits
	2015(a)		2014(a)		2013		2015		2014		2013
Generation	$	231	$	173	$	119	$	14	$	124	$	30
ComEd	143		122		118		7		125		4
PECO	40		11		11		—		5		20
BGE	1		—		—		16		17		24
BSC(b)	47		26		91		3		20		5
Exelon	$	462	$	332	$	339	$	40	$	291	$	83

_________________________

(a) Exelon's and Generation's pension contributions include $36 million and $43 million related to the legacy CENG plans that was funded by CENG as provided in an Employee Matters Agreement (EMA) between Exelon and CENG for the years ended December 31, 2015 and 2014, respectively.

(b) Includes $5 million, $9 million, and $72 million of pension contributions funded by Exelon Corporate, for the years ended December 31, 2015, 2014, and 2013, respectively.

Defined Benefit Plan Estimated Future Benefit Payments

Estimated future benefit payments to participants in all of the pension plans and postretirement benefit plans at December 31, 2015 were:

	Pension Benefits		Other Postretirement Benefits
2016	$	1,153	$	217
2017	997		223
2018	1,009		228
2019	1,036		235
2020	1,071		244
2021 through 2025	5,923		1,341
Total estimated future benefit payments through 2025	$	11,189	$	2,488

Schedule Of Pension And Other Postretirement Benefit Costs

. These amounts include the recognized contractual termination benefit charges, curtailment gains, and settlement charges:

For the Year Ended December 31,	Generation		ComEd		PECO		BSC(a)		BGE		Exelon
2015	$	269	$	206	$	39	$	57	$	66	637
2014	250		162		36		46		67		561
2013	347		309		43		71		55		825

_____________________

(a) These amounts primarily represent amounts billed to Exelon’s subsidiaries through intercompany allocations. These amounts are not included in the Generation, ComEd, PECO or BGE amounts above.

Defined Benefit Plan Weighted Average Asset Allocations And Target Allocations

Exelon’s pension and other postretirement benefit plan target asset allocations at December 31, 2015 and 2014 asset allocations were as follows:

Pension Plans

			Percentage of Plan Assets at December 31,
Asset Category	Target Allocation		2015		2014
Equity securities	32	%	35	%	33	%
Fixed income securities	37	%	34		37
Alternative investments(a)	31	%	31		30
Total			100	%	100	%

Other Postretirement Benefit Plans

			Percentage of Plan Assets at December 31,
Asset Category	Target Allocation		2015		2014
Equity securities	39	%	43	%	42	%
Fixed income securities	26	%	27		34
Alternative investments(a)	35	%	30		24
Total			100	%	100	%

___________________

(a) Alternative investments include private equity, hedge funds, real estate, and private credit.

Defined Benefit Plan Fair Value Of Plan Assets

The following table presents Exelon’s pension and other postretirement benefit plan assets measured and recorded at fair value on Exelon’s Consolidated Balance Sheets on a recurring basis and their level within the fair value hierarchy at December 31, 2015 and 2014:

At December 31, 2015(a)	Level 1		Level 2		Level 3		Total
Pension plan assets
Cash equivalents	$	210	$	—	$	—	$	210
Equities(b)	3,571		1,462		2		5,035
Fixed income:
U.S. Treasury and agencies	1,001		79		—		1,080
State and municipal debt	—		61		—		61
Corporate debt	—		2,901		165		3,066
Other(b)	—		395		203		598
Fixed income subtotal	1,001		3,436		368		4,805
Private equity	—		—		924		924
Hedge funds	—		1,129		795		1,924
Real estate	—		—		725		725
Private credit	—		—		699		699
Pension plan assets subtotal	4,782		6,027		3,513		14,322

At December 31, 2015(a)	Level 1		Level 2		Level 3		Total
Other postretirement benefit plan assets
Cash equivalents	15		—		—		15
Equities	510		482		—		992
Fixed income:
U.S. Treasury and agencies	11		53		—		64
State and municipal debt	—		131		—		131
Corporate debt	—		44		—		44
Other	155		205		—		360
Fixed income subtotal	166		433		—		599
Hedge funds	—		312		139		451
Real estate	—		—		131		131
Private credit	—		—		103		103
Other postretirement benefit plan assets subtotal	691		1,227		373		2,291
Total pension and other postretirement benefit plan assets(c)	$	5,473	$	7,254	$	3,886	$	16,613

At December 31, 2014(a)	Level 1		Level 2		Level 3		Total
Pension plan assets
Cash equivalents	$	1	$	—	$	—	$	1
Equities(b)	3,261		1,449		2		4,712
Fixed income:
U.S. Treasury and agencies	1,051		88		—		1,139
State and municipal debt	—		80		—		80
Corporate debt	—		3,125		120		3,245
Other(b)	—		930		152		1,082
Fixed income subtotal	1,051		4,223		272		5,546
Private equity	—		—		900		900
Hedge funds	—		1,355		785		2,140
Real estate	243		—		685		928
Private credit	—		—		607		607
Pension plan assets subtotal	4,556		7,027		3,251		14,834

At December 31, 2014(a)	Level 1		Level 2		Level 3		Total
Other postretirement benefit plan assets
Cash equivalents	11		—		—		11
Equities	480		525		—		1,005
Fixed income:
U.S. Treasury and agencies	15		59		—		74
State and municipal debt	—		197		—		197
Corporate debt	—		42		—		42
Other	253		272		—		525
Fixed income subtotal	268		570		—		838
Hedge funds	—		339		—		339
Real estate	8		—		116		124
Private credit	—		—		110		110
Other postretirement benefit plan assets subtotal	767		1,434		226		2,427
Total pension and other postretirement benefit plan assets(c)	$	5,323	$	8,461	$	3,477	$	17,261

__________________________

(a) See Note 12—Fair Value of Financial Assets and Liabilities for a description of levels within the fair value hierarchy.

(b) Includes derivative instruments of $5 million and $(3) million, which have a total notional amount of $1,774 million and $1,491 million at December 31, 2015 and 2014, respectively. The notional principal amounts for these instruments provide one measure of the transaction volume outstanding as of the fiscal years ended and do not represent the amount of the company’s exposure to credit or market loss.

(c) Excludes net assets of $27 million and $42 million at December 31, 2015 and 2014, respectively, which are required to reconcile to the fair value of net plan assets. These items consist primarily of receivables related to pending securities sales, interest and dividends receivable, and payables related to pending securities purchases.

Defined Benefit Plan Fair Value Of Plan Assets Unobservable Input Reconciliation

The following table presents the reconciliation of Level 3 assets and liabilities measured at fair value for pension and other postretirement benefit plans for the years ended December 31, 2015 and 2014:

	Hedge funds			Private equity			Real estate			Fixed income			Equities		Private Credit			Total
Pension Assets
Balance as of January 1, 2015	$	785		$	900		$	685		$	272		$	2	$	607		$	3,251
Actual return on plan assets:
Relating to assets still held at the reporting date	(39		)	60			76			(14		)	—		(19		)	64
Relating to assets sold during the period	4			—			9			—			—		—			13
Purchases, sales and settlements:
Purchases	104			186			116			125			—		200			731
Sales	(57		)	—			(54		)	(7		)	—		(5		)	(123		)
Settlements(a)	(2		)	(222		)	(107		)	(8		)	—		(84		)	(423		)
Balance as of December 31, 2015	$	795		$	924		$	725		$	368		$	2	$	699		$	3,513
Other Postretirement Benefits
Balance as of January 1, 2015	$	—		$	—		$	116		$	—		$	—	$	110		$	226
Actual return on plan assets:
Relating to assets still held at the reporting date	1			—			15			—			—		(7		)	9
Purchases, sales and settlements:
Purchases	138			—			62			—			—		—			200
Settlements(a)	—			—			(62		)	—			—		—			(62		)
Balance as of December 31, 2015	$	139		$	—		$	131		$	—		$	—	$	103		$	373

	Hedge funds			Private equity			Real estate			Fixed income			Equities		Private credit			Total
Pension Assets
Balance as of January 1, 2014	$	706		$	806		$	544		$	41		$	2	$	371		$	2,470
Actual return on plan assets:
Relating to assets still held at the reporting date	59			112			81			7			—		20			279
Relating to assets sold during the period	2			—			—			—			—		1			3
Purchases, sales and settlements:
Purchases	74			169			112			227			—		265			847
Sales	(25		)	—			(19		)	(3		)	—		(13		)	(60		)
Settlements(a)	(1		)	(203		)	(60		)	—			—		(37		)	(301		)
Transfers into (out of) Level 3(b)(c)	(30		)	16			27			—			—		—			13
Balance as of December 31, 2014	$	785		$	900		$	685		$	272		$	2	$	607		$	3,251
Other Postretirement Benefits
Balance as of January 1, 2014	$	—		$	2		$	109		$	—		$	—	$	4		$	115
Actual return on plan assets:
Relating to assets still held at the reporting date	—			—			13			—			—		1			14
Purchases, sales and settlements:
Purchases	—			1			1			—			—		109			111
Sales	—			(2		)	(7		)	—			—		(4		)	(13		)
Settlements(a)	—			(1		)	—			—			—		—			(1		)
Balance as of December 31, 2014	$	—		$	—		$	116		$	—		$	—	$	110		$	226

________________________

(a) Represents cash settlements only.

(b) In connection with the Employee Matters Agreement between EDF and Exelon, Exelon assumed the pension plan assets of Nine Mile Point Nuclear Station, LLC and Constellation Energy Nuclear Group, LLC resulting in transfers into Level 3 of $56 million.

(c) As of January 1, 2015 and January 1, 2014, hedge fund investments that contained redemption restrictions limiting Exelon’s ability to redeem the investments within a reasonable period of time were classified as Level 3 investments. As of December 31, 2014, restrictions for certain investments no longer applied, therefore allowing redemption within a reasonable period of time from the measurement date at NAV. As such, these hedge fund investments are reflected as transfers out of Level 3 to Level 2 of $43 million in 2014.

Schedule Of Defined Contributions

. The following table presents matching contributions to the savings plan for the years ended December 31, 2015, 2014 and 2013:

For the Year Ended December 31,	Exelon(a)		Generation(a)		ComEd		PECO		BGE		BSC(b)
2015	$	148	$	80	$	32	$	11	$	14	$	11
2014	103		51		26		8		8		10
2013	85		40		22		8		8		7

_________________________

(a) Includes $9 million and $5 million related to CENG for the year ended December 31, 2015, and for the period from April 1, 2014 to December 31, 2014, respectively.

(b) These amounts primarily represent amounts billed to Exelon’s subsidiaries through intercompany allocations. These costs are not included in the Generation, ComEd, PECO, or BGE amounts above.