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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
PHI Merger Commitments [Table Text Block] The following amounts represent total commitment costs that have been recorded since the acquisition date and the total remaining obligations for Exelon, PHI, Pepco, DPL, and ACE as of December 31, 2021:
DescriptionExelonPHIPepcoDPLACE
Total commitments$513 $320 $120 $89 $111 
Remaining commitments(a)
68 58 48 6 4 
__________
(a)Remaining commitments extend through 2026 and include rate credits, energy efficiency programs, and delivery system modernization.
Commercial Commitments The Registrants' commercial commitments as of December 31, 2021, representing commitments potentially triggered by future events were as follows:
Expiration within
ExelonTotal202220232024202520262027 and beyond
Letters of credit$17  $17  $—  $—  $—  $— $— 
Surety bonds(a)
109 107 — 2 — — — 
Financing trust guarantees378  — — — — — 378 
Guaranteed lease residual values(b)
31 — 5 6 6 5 9 
Total commercial commitments $535  $124  $5  $8  $6 $5 $387 
ComEd
Letters of credit$7 $7 $— $— $— $— $— 
Surety bonds(a)
17 15 — 2 — — — 
Financing trust guarantees200 — — — — — 200 
Total commercial commitments $224  $22  $—  $2  $— $— $200 
PECO
Letters of credit$1 $1 $— $— $— $— $— 
Surety bonds(a)
2 2 — — — — — 
Financing trust guarantees178 — — — — — 178 
Total commercial commitments $181  $3  $—  $—  $— $— $178 
BGE
Letters of credit$2 $2 $— $— $— $— $— 
Surety bonds(a)
3 3 — — — — — 
Total commercial commitments $5  $5  $—  $—  $— $— $— 
PHI
Surety bonds(a)
$23 $23 $— $— $— $— $— 
Guaranteed lease residual values(b)
31 — 5 6 6 5 9 
Total commercial commitments $54  $23  $5  $6  $6 $5 $9 
Pepco
Surety bonds(a)
$14 $14 $— $— $— $— $— 
Guaranteed lease residual values(c)
10 — 1 2 2 2 3 
Total commercial commitments $24  $14  $1  $2  $2 $2 $3 
DPL
Surety bonds(a)
$5 $5 $— $— $— $— $— 
Guaranteed lease residual values(b)
13 — 2 3 2 2 4 
Total commercial commitments $18  $5  $2  $3  $2 $2 $4 
ACE
Surety bonds(a)
$4 $4 $— $— $— $— $— 
Guaranteed lease residual values(b)
8 — 2 1 2 1 2 
Total commercial commitments $12  $4  $2  $1  $2 $1 $2 
__________
(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 $75 million guaranteed by Exelon and PHI, of which $25 million, $31 million, and $19 million is guaranteed by Pepco, DPL, and ACE, respectively. 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 As of December 31, 2021 and 2020, the Registrants had accrued the following undiscounted amounts for environmental liabilities in Other current liabilities and Other deferred credits and other liabilities in their respective Consolidated Balance Sheets:
December 31, 2021December 31, 2020
Total environmental
investigation and
remediation liabilities		Portion of total related to
MGP investigation and
remediation		Total environmental
investigation and
remediation liabilities		Portion of total related to
MGP investigation and
remediation
Exelon$352 $303 $366 $314 
ComEd279 279 293 293 
PECO22 20 23 21 
BGE6 4 2 — 
PHI 42 — 44 — 
Pepco40 — 42 — 
DPL1 — 1 — 
ACE1 — 1 —