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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2018
Commitments And Contingencies Tables Disclosure [Line Items]  
Other Commitments
The following amounts represent total commitment costs for Exelon, PHI, Pepco, DPL and ACE that have been recorded since the acquisition date and the remaining obligations as of March 31, 2018:
Description
Expected Payment Period
 
Pepco
 
DPL
 
ACE
 
PHI
 
Exelon
Rate credits
2016 - 2017
 
$
91

 
$
67

 
$
101

 
$
259

 
$
259

Energy efficiency
2016 - 2021
 
—

 
—

 
—

 
—

 
122

Charitable contributions
2016 - 2026
 
28

 
12

 
10

 
50

 
50

Delivery system modernization
Q2 2017
 
—

 
—

 
—

 
—

 
22

Green sustainability fund
Q2 2017
 
—

 
—

 
—

 
—

 
14

Workforce development
2016 - 2020
 
—

 
—

 
—

 
—

 
17

Other
 
 
1

 
5

 
—

 
6

 
29

Total commitments
 
 
$
120

 
$
84

 
$
111

 
$
315

 
$
513

Remaining commitments
 
 
$
75

 
$
12

 
$
8

 
$
95

 
$
165

Commercial Commitments (All Registrants)
The Registrants’ commercial commitments as of March 31, 2018, representing commitments potentially triggered by future events were as follows:
 
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Letters of credit (non-debt)(a)
 
$
1,586

 
$
1,533

 
$
2

 
$
1

 
$
5

 
$
1

 
$
1

 
$
—

 
$
—

Surety bonds(b)
 
1,651

 
1,463

 
9

 
9

 
10

 
66

 
32

 
4

 
5

Financing trust guarantees
 
378

 
—

 
200

 
178

 
—

 
—

 
—

 
—

 
—

Guaranteed lease residual values(c)
 
22

 
—

 
—

 
—

 
—

 
22

 
7

 
9

 
6

Total commercial commitments
 
$
3,637

 
$
2,996

 
$
211

 
$
188

 
$
15


$
89

 
$
40

 
$
13

 
$
11

_________
(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. Includes letters of credits issued under credit facility agreements arranged at minority and community banks and nonrecourse debt letters of credits.
(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 $58 million, $17 million of which is a guarantee by Pepco, $24 million by DPL and $16 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.
Accrued environmental liabilities
of March 31, 2018 and December 31, 2017, 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, 2018
Total environmental
investigation and
remediation reserve
 
Portion of total related to
MGP investigation and
remediation
Exelon
$
462


$
313

Generation
117

 
—

ComEd
283

 
281

PECO
29

 
28

BGE
5

 
4

PHI
28


—

Pepco
26

 
—

DPL
1

 
—

ACE
1

 
—

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

 
—