Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies [Line Items]

Other Commitments

Commercial Commitments

Exelon’s commercial commitments as of December 31, 2017, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2018		2019		2020		2021		2022		2023 and beyond
Letters of credit (non-debt)(a)	$	1,226	$	1,056	$	154	$	16	$	—	$	—	$	—
Surety bonds(b)	1,381		1,293		66		16		6		—		—
Financing trust guarantees	378		—		—		—		—		—		378
Guaranteed lease residual values(c)	21		—		—		—		—		—		21
Total commercial commitments	$	3,006	$	2,349	$	220	$	32	$	6	$	—	$	399

__________

(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) 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 $56 million, $16 million of which is a guarantee by Pepco, $23 million by DPL and $15 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.

Generation’s commercial commitments as of December 31, 2017, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2018		2019		2020		2021		2022		2023 and beyond
Letters of credit (non-debt)(a)	$	1,177	$	1,007	$	154	$	16	$	—	$	—	$	—
Surety bonds	1,209		1,164		45		—		—		—		—
Total commercial commitments	$	2,386	$	2,171	$	199	$	16	$	—	$	—	$	—

__________

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

ComEd’s commercial commitments as of December 31, 2017, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2018		2019		2020		2021		2022		2023 and beyond
Letters of credit (non-debt)(a)	$	2	$	2	$	—	$	—	$	—	$	—	$	—
Surety bonds(b)	10		8		2		—		—		—		—
Financing trust guarantees	200		—		—		—		—		—		200
Total commercial commitments	$	212	$	10	$	2	$	—	$	—	$	—	$	200

__________

(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’s commercial commitments as of December 31, 2017, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2018		2019		2020		2021		2022		2023 and beyond
Surety bonds(a)	$	9	$	8	$	1	$	—	$	—	$	—	$	—
Financing trust guarantees	178		—		—		—		—		—		178
Total commercial commitments	$	187	$	8	$	1	$	—	$	—	$	—	$	178

__________

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

BGE’s commercial commitments as of December 31, 2017, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2018		2019		2020		2021		2022		2023 and beyond
Letters of credit (non-debt)(a)	$	2	$	2	$	—	$	—	$	—	$	—	$	—
Surety bonds(b)	11		10		1		—		—		—		—
Total commercial commitments	$	13	$	12	$	1	$	—	$	—	$	—	$	—

__________

(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.

PHI commercial commitments (Successor) as of December 31, 2017, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2018		2019		2020		2021		2022		2023 and beyond
Surety bonds	$	63	$	48	$	15	$	—	$	—	$	—	$	—
Guaranteed lease residual values(a)	21		—		—		—		—		—		21
Total commercial commitments	$	84	$	48	$	15	$	—	$	—	$	—	$	21

__________

(a) 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 $56 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.

Pepco commercial commitments as of December 31, 2017, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2018		2019		2020		2021		2022		2023 and beyond
Surety bonds(a)	$	54	$	41	$	13	$	—	$	—	$	—	$	—
Guaranteed lease residual values(b)	6		—		—		—		—		—		6
Total commercial commitments	$	60	$	41	$	13	$	—	$	—	$	—	$	6

__________

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

(b) 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 $16 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.

DPL commercial commitments as of December 31, 2017, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2018		2019		2020		2021		2022		2023 and beyond
Surety bonds(a)	$	4	$	3	$	1	$	—	$	—	$	—	$	—
Guaranteed lease residual values(b)	8		—		—		—		—		—		8
Total commercial commitments	$	12	$	3	$	1	$	—	$	—	$	—	$	8

__________

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

(b) 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 $23 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.

ACE commercial commitments as of December 31, 2017, representing commitments potentially triggered by future events, were as follows:

			Expiration within
	Total		2018		2019		2020		2021		2022		2023 and beyond
Surety bonds	$	4	$	3	$	1	$	—	$	—	$	—	$	—
Guaranteed lease residual values(a)	6		—		—		—		—		—		6
Total commercial commitments	$	10	$	3	$	1	$	—	$	—	$	—	$	6

__________

(a) 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 $15 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.

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

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, 2017 were:

											Successor
	Exelon(a)		Generation(a)		ComEd(a)(c)		PECO(a)(c)		BGE(a)(c)(d)(e)		PHI(a)		Pepco(a)		DPL(a)(c)		ACE(a)
2018	$	188	$	74	$	7	$	5	$	34	$	56	$	8	$	20	$	9
2019	129		29		6		5		34		42		7		10		8
2020	147		47		4		5		34		44		6		13		8
2021	142		48		4		5		32		40		5		12		7
2022	119		46		2		5		17		39		4		12		6
Remaining years	787		573		—		—		19		194		8		54		19
Total minimum future lease payments	$	1,512	$	817	$	23	$	25	$	170	$	415	$	38	$	121	$	57

__________

(a) Includes amounts related to shared use land arrangements.

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

(c) 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 2018—2022, was $2 million, $5 million, $1 million and $2 million, respectively. Also includes amounts related to shared use land arrangements.

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

(e) 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 $25 million, $26 million, $28 million , $28 million and $14 million related to years 2018, 2019, 2020, 2021and 2022, respectively.

The following table presents the Registrants’ rental expense under operating leases for the years ended December 31, 2017, 2016 and 2015:

For the Year Ended December 31,	Exelon		Generation(a)		ComEd		PECO		BGE		Pepco		DPL		ACE
2017	$	709	$	578	$	9	$	9	$	32	$	11	$	16	$	14
2016	777		667		15		7		22		8		15		13
2015	922		851		12		9		32		7		14		13

	Successor				Predecessor
	For the Year Ended December 31, 2017		March 24, 2016 to December 31, 2016		January 1, 2016 to March 23, 2016		For the Year Ended December 31, 2015
PHI
Rental expense under operating leases	$	63	$	49	$	12	$	60

__________

(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 $508 million, $604 million and $798 million during 2017, 2016 and 2015, respectively. Excludes contract amortization associated with purchase accounting and contract acquisitions.

Accrued environmental liabilities

As of December 31, 2017 and 2016, 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, 2017	Total environmental investigation and remediation reserve		Portion of total related to MGP investigation and remediation
Exelon	$	466	$	315
Generation	117		—
ComEd	285		283
PECO	30		28
BGE	5		4
PHI	29		—
Pepco	27		—
DPL	1		—
ACE	1		—

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

Schedule of Government Settlement Agreements [Table Text Block]

Under the settlement agreements, Generation has received cumulative cash reimbursements for costs incurred as follows:

	Total		Net(a)
Cumulative cash reimbursements(b)	$	1,167	$	1,006

__________

(a) Total after considering amounts due to co-owners of certain nuclear stations and to the former owner of Oyster Creek.

(b) Includes $53 and $49, respectively, for amounts received since April 1, 2014, for costs incurred under the CENG DOE Settlement Agreements prior to the consolidation of CENG.

As of December 31, 2017 and 2016, 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, 2017			December 31, 2016
DOE receivable - current(a)	$	94		$	109
DOE receivable - noncurrent(b)	15			15
Amounts owed to co-owners(a)(c)	(11		)	(13		)

__________

(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.