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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2019
Commitments And Contingencies Tables Disclosure [Line Items]  
Other Commitments The Registrants’ commercial commitments as of June 30, 2019, representing commitments potentially triggered by future events were as follows:
 
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Letters of credit
 
$
1,315

 
$
1,283

 
$
7

 
$
—

 
$
9

 
$
10

 
$
10

 
$
—

 
$
—

Surety bonds(a)
 
1,492

 
1,271

 
52

 
9

 
17

 
39

 
31

 
4

 
3

Financing trust guarantees
 
378

 
—

 
200

 
178

 
—

 
—

 
—

 
—

 
—

Guaranteed lease residual values(b)
 
26

 
—

 
—

 
—

 
—

 
26

 
9

 
11

 
7

Total commercial commitments
 
$
3,211

 
$
2,554

 
$
259

 
$
187

 
$
26


$
75

 
$
50

 
$
15

 
$
10

_________
(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 lease term associated with these assets ranges from 1 to 8 years. The maximum potential obligation at the end of the minimum lease term would be $68 million, $23 million of which is a guarantee by Pepco, $28 million by DPL and $17 million by ACE. Historically, payments under the guarantees have not been made and PHI believes the likelihood of payments being required under the guarantees is remote.
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 June 30, 2019:
Description
Expected Payment Period
 
Exelon
 
PHI
 
Pepco
 
DPL
 
ACE
Rate credits
2016 - 2021
 
$
264

 
$
264

 
$
91

 
$
72

 
$
101

Energy efficiency
2016 - 2021
 
117

 
—

 
—

 
—

 
—

Charitable contributions
2016 - 2026
 
50

 
50

 
28

 
12

 
10

Delivery system modernization
Q2 2017
 
22

 
—

 
—

 
—

 
—

Green sustainability fund
Q2 2017
 
14

 
—

 
—

 
—

 
—

Workforce development
2016 - 2020
 
17

 
—

 
—

 
—

 
—

Other
 
 
29

 
6

 
1

 
5

 
—

Total commitments
 
 
$
513

 
$
320

 
$
120

 
$
89

 
$
111

Remaining commitments
 
 
$
116

 
$
86

 
$
69

 
$
11

 
$
6
Accrued environmental liabilities
As of June 30, 2019 and December 31, 2018, 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:
June 30, 2019
Total environmental
investigation and
remediation reserve
 
Portion of total related to
MGP investigation and
remediation
Exelon
$
482


$
345

Generation
107

 
—

ComEd
318

 
318

PECO
25

 
24

BGE
5

 
3

PHI
27


—

Pepco
24

 
—

DPL
1

 
—

ACE
1

 
—

December 31, 2018
Total environmental
investigation and
remediation reserve
 
Portion of total related to
MGP investigation and
remediation
Exelon
$
496


$
356

Generation
108

 
—

ComEd
329

 
327

PECO
27

 
25

BGE
5

 
4

PHI
27


—

Pepco
25

 
—

DPL
1

 
—

ACE
1

 
—