Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2017

Commitments And Contingencies Tables Disclosure [Line Items]

The Registrants’ commercial commitments as of March 31, 2017 , representing commitments potentially triggered by future events were as follows:



											Successor
	Exelon		Generation		ComEd		PECO		BGE		PHI		Pepco		DPL		ACE
Letters of credit (non-debt)^(a)	$	1,527	$	1,440	$	14	$	23	$	5	$	1	$	1	$	—	$	—
Surety bonds^(b)	1,038		964		5		7		11		16		9		4		3
Financing trust guarantees	628		—		200		178		250		—		—		—		—
Guaranteed lease residual values^(c)	19		—		—		—		—		19		5		7		5
Total commercial commitments	$	3,212	$	2,404	$	219	$	208	$	266	$	36	$	15	$	11	$	8

________


(a)	Letters of credit (non-debt) - Exelon and certain 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.

Accrued environmental liabilities

of Three Months Ended March 31, 2017 and December 31, 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:



March 31, 2017	Total Environmental Investigation and Remediation Reserve		Portion of Total Related to MGP Investigation and Remediation
Exelon	$	425	$	319
Generation	71		—
ComEd	288		286
PECO	33		31
BGE	4		2
PHI (Successor)	29		—
Pepco	26		—
DPL	2		—
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 (Successor)	30		1
Pepco	27		—
DPL	2		1
ACE	1		—

Exelon Generation Co L L C [Member] | Equity Method Investments [Member]

Commitments And Contingencies Tables Disclosure [Line Items]

Other Commitments

, Generation’s estimated commitments relating to its equity purchase agreements, including the in-kind services contributions, is anticipated to be as follows:



	Total
2017	$	9
2018	7
2019	3
Total	$	19