Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

Commitments and Contingencies [Line Items]

Schedule of Government Settlement Agreements [Table Text Block]

As of December 31, 2016, and 2015, the amount of SNF storage costs for which reimbursement has been or will be requested from the DOE under the DOE settlement agreements is as follows:

	December 31, 2016			December 31, 2015
DOE receivable - current (a)	$	109		$	76
DOE receivable - noncurrent (b)	15			14
Amounts owed to co-owners (a)(c)	(13		)	(5		)

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(a) Recorded in Accounts receivable, other.

(b) Recorded in Deferred debits and other assets, other

(c) Non-CENG amounts owed to co-owners are recorded in Accounts receivable, other.  CENG amounts owed to co-owners are recorded in Accounts payable. Represents amounts owed to the co-owners of Peach Bottom, Quad Cities, and Nine Mile Point Unit 2 generating facilities.

Commercial Commitments

Exelon’s commercial commitments as of December 31, 2016, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2017		2018		2019		2020		2021		2022 and beyond
Letters of credit (non-debt)(a)	$	1,614	$	1,355	$	246	$	—	$	13	$	—	$	—
Surety bonds(b)	1,035		978		33		2		16		6		—
Financing trust guarantees(c)	628		—		—		—		—		—		628
Guaranteed lease residual values(d)	20		—		—		—		—		—		20
Total commercial commitments	$	3,297	$	2,333	$	279	$	2	$	29	$	6	$	648

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(a) Letters of credit (non-debt)—Exelon and certain of its subsidiaries maintain non-debt letters of credit to provide credit support for certain transactions as requested by third parties.

(b) Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds.

(c) Includes $200 million of Trust Preferred Securities of ComEd Financing III, $178 million of Trust Preferred Securities of PECO Trust III and IV and $250 million of Trust Preferred Securities of BGE Capital Trust II.

(d) Represents the maximum potential obligation in the event that the fair value of certain leased equipment and fleet vehicles is zero at the end of the maximum lease term. The maximum lease term associated with these assets ranges from 3 to 8 years. The maximum potential obligation at the end of the minimum lease term would be $50 million, $14 million of which is a guarantee by Pepco, $17 million by DPL and $13 million by ACE. The minimum lease term associated with these assets ranges from 1 to 4 years. Historically, payments under the guarantees have not been made and PHI believes the likelihood of payments being required under the guarantees is remote.

Other Commitments

As of December 31, 2016, Generation’s estimated commitment relating to its equity purchase agreements, including in-kind services contributions, is anticipated to be as follows:

	Total
2017	$	34
2018	5
Total	$	39

Operating Leases Of Lessee Disclosure

Minimum future operating lease payments, including lease payments for contracted generation, vehicles, real estate, computers, rail cars, operating equipment and office equipment, as of December 31, 2016 were:

	Exelon (a)		Generation(a)		ComEd (b)		PECO (b)		BGE (b)(c)(d)		PHI		Pepco		DPL (b)		ACE
2017	$	183	$	70	$	11	$	3	$	32	$	50	$	7	$	13	$	8
2018	179		75		6		3		34		49		6		17		8
2019	123		30		6		4		34		36		5		7		7
2020	140		48		3		4		34		38		4		10		6
2021	133		47		3		4		32		34		3		9		5
Remaining years	968		644		—		—		33		211		7		54		20
Total minimum future lease payments	$	1,726	$	914	$	29	$	18	$	199	$	418	$	32	$	110	$	54

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(a) Excludes Generation’s contingent operating lease payments associated with contracted generation agreements.

(b) Amounts related to certain real estate leases and railroad licenses effectively have indefinite payment periods. As a result, ComEd, PECO, BGE and DPL have excluded these payments from the remaining years, as such amounts would not be meaningful. ComEd’s, PECO’s, BGE’s and DPL's average annual obligation for these arrangements, included in each of the years 2017—2021, was $2 million, $4 million, $2 million and $2 million, respectively.

(c) Includes all future lease payments on a 99 year real estate lease that expires in 2106.

(d) The BGE column above includes minimum future lease payments associated with a 6-year lease for the Baltimore City conduit system that became effective during the fourth quarter of 2016. BGE's total commitments under the lease agreement are $21 million $25 million, $26 million , $27 million, $28 million, and $14 million related to years 2017, 2018, 2019, 2020, 2021 and thereafter, respectively.

Operating Leases Rent Expense

The following table presents the Registrants’ rental expense under operating leases for the years ended December 31, 2016, 2015 and 2014:

For the Year Ended December 31,	Exelon		Generation (a)		ComEd		PECO		BGE		Pepco		DPL		ACE
2016	$	777	$	667	$	15	$	7	$	22	$	8	$	15	$	13
2015	922		851		12		9		32		7		14		13
2014	865		806		15		14		12		8		14		12

	Successor		Predecessor
	March 24, 2016 to December 31, 2016		January 1, 2016 to March 23, 2016	For the Year Ended December 31, 2015	For the Year Ended December 31, 2014
PHI
Rental expense under operating leases	$	49	12	60	59

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(a) Includes contingent operating lease payments associated with contracted generation agreements that are not included in the minimum future operating lease payments table above. Payments made under Generation’s contracted generation lease agreements totaled $604 million, $798 million and $755 million during 2016, 2015 and 2014, respectively. Excludes contract amortization associated with purchase accounting and contract acquisitions.

Accrued environmental liabilities

As of December 31, 2016 and 2015, the Registrants had accrued the following undiscounted amounts for environmental liabilities in Other current liabilities and Other deferred credits and other liabilities within their respective Consolidated Balance Sheets:

December 31, 2016	Total environmental investigation and remediation reserve		Portion of total related to MGP investigation and remediation (a)
Exelon	$	429	$	325
Generation	72		—
ComEd	292		291
PECO	33		31
BGE (a)	2		2
PHI	30		1
Pepco	27		—
DPL	2		1
ACE	1		—

December 31, 2015	Total environmental investigation and remediation reserve		Portion of total related to MGP investigation and remediation
Exelon	$	369	$	301
Generation	63		—
ComEd	266		264
PECO	37		35
BGE	3		2
PHI (Predecessor)	33		1
Pepco	24		—
DPL	3		1
ACE	1		—

Exelon Generation Co L L C [Member]

Commitments and Contingencies [Line Items]

Commercial Commitments

Generation’s commercial commitments as of December 31, 2016, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2017		2018		2019		2020		2021		2022 and beyond
Letters of credit (non-debt)(a)	$	1,546	$	1,287	$	246	$	—	$	13	$	—	$	—
Surety bonds	945		918		27		—		—		—		—
Total commercial commitments	$	2,491	$	2,205	$	273	$	—	$	13	$	—	$	—

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(a) Letters of credit (non-debt)—Non-debt letters of credit maintained to provide credit support for certain transactions as requested by third parties.

Commonwealth Edison Co [Member]

Commitments and Contingencies [Line Items]

Commercial Commitments

ComEd’s commercial commitments as of December 31, 2016, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2017		2018		2019		2020		2021		2022 and beyond
Letters of credit (non-debt)(a)	$	14	$	14	$	—	$	—	$	—	$	—	$	—
Surety bonds(b)	11		9		2				—		—		—
Financing trust guarantees	200		—		—		—		—		—		200
Total commercial commitments	$	225	$	23	$	2	$	—	$	—	$	—	$	200

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(a) Letters of credit (non-debt)—ComEd maintains non-debt letters of credit to provide credit support for certain transactions as requested by third parties.

(b) Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds.

PECO Energy Co [Member]

Commitments and Contingencies [Line Items]

Commercial Commitments

PECO’s commercial commitments as of December 31, 2016, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2017		2018		2019		2020		2021		2022 and beyond
Letters of credit (non-debt)(a)	$	23	$	23	$	—	$	—	$	—	$	—	$	—
Surety bonds(b)	9		9		—		—		—		—		—
Financing trust guarantees	178		—		—		—		—		—		178
Total commercial commitments	$	210	$	32	$	—	$	—	$	—	$	—	$	178

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(a) Letters of credit (non-debt)—PECO maintains non-debt letters of credit to provide credit support for certain transactions as requested by third parties.

(b) Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds.

Baltimore Gas and Electric Company [Member]

Commitments and Contingencies [Line Items]

Commercial Commitments

BGE’s commercial commitments as of December 31, 2016, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2017		2018		2019		2020		2021		2022 and beyond
Letters of credit (non-debt)(a)	$	2	$	2	$	—	$	—	$	—	$	—	$	—
Surety bonds(b)	11		10		1		—		—		—		—
Financing trust guarantees	250		—		—		—		—		—		250
Total commercial commitments	$	263	$	12	$	1	$	—	$	—	$	—	$	250

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(a) Letters of credit (non-debt)—BGE maintains non-debt letters of credit to provide credit support for certain transactions as requested by third parties.

(b) Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds.

Pepco Holdings LLC [Member]

Commitments and Contingencies [Line Items]

Commercial Commitments

PHI commercial commitments (Successor) as of December 31, 2016, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2017		2018		2019		2020		2021		2022 and beyond
Letters of credit (non-debt)(a)	$	1	$	1	$	—	$	—	$	—	$	—	$	—
Surety bonds(b)	16		14		2		—		—		—		—
Guaranteed lease residual values(c)	20		—		—		—		—		—		20
Total commercial commitments	$	37	$	15	$	2	$	—	$	—	$	—	$	20

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(a) Letters of credit (non-debt)—PHI and certain of its subsidiaries maintain non-debt letters of credit to provide credit support for certain transactions as requested by third parties.

(b) Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds.

(c) Represents the maximum potential obligation in the event that the fair value of certain leased equipment and fleet vehicles is zero at the end of the maximum lease term. The maximum lease term associated with these assets ranges from 3 to 8 years. The maximum potential obligation at the end of the minimum lease term would be $50 million. The minimum lease term associated with these assets ranges from 1 to 4 years. Historically, payments under the guarantees have not been made and PHI believes the likelihood of payments being required under the guarantees is remote.

Potomac Electric Power Company [Member]

Commitments and Contingencies [Line Items]

Commercial Commitments

Pepco commercial commitments as of December 31, 2016, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2017		2018		2019		2020		2021		2022 and beyond
Surety bonds(a)	9		9		—		—		—		—		—
Guaranteed lease residual values(b)	6		—		—		—		—		—		6
Total commercial commitments	$	15	$	9	$	—	$	—	$	—	$	—	$	6

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Delmarva Power and Light Company [Member]

Commitments and Contingencies [Line Items]

Commercial Commitments

DPL commercial commitments as of December 31, 2016, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2017		2018		2019		2020		2021		2022 and beyond
Surety bonds(a)	4		3		1		—		—		—		—
Guaranteed lease residual values(b)	7		—		—		—		—		—		7
Total commercial commitments	$	11	$	3	$	1	$	—	$	—	$	—	$	7

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Atlantic City Electric Company [Member]

Commitments and Contingencies [Line Items]

Commercial Commitments

ACE commercial commitments as of December 31, 2016, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2017		2018		2019		2020		2021		2022 and beyond
Letters of credit (non-debt)(a)	$	1	$	1	$	—	$	—	$	—	$	—	$	—
Surety bonds(b)	3		2		1		—		—		—		—
Guaranteed lease residual values(c)	5		—		—		—		—		—		5
Total commercial commitments	$	9	$	3	$	1	$	—	$	—	$	—	$	5

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(a) Letters of credit (non-debt)—ACE maintains non-debt letters of credit to provide credit support for certain transactions as requested by third parties.

(b) Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds.

(c) Represents the maximum potential obligation in the event that the fair value of certain leased equipment and fleet vehicles is zero at the end of the maximum lease term. The maximum lease term associated with these assets ranges from 3 to 8 years. The maximum potential obligation at the end of the minimum lease term would be $13 million. The minimum lease term associated with these assets ranges from 1 to 4 years. Historically, payments under the guarantees have not been made and PHI believes the likelihood of payments being required under the guarantees is remote.