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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$2,397  $2,296  $101  $—  $—  $— $— 
Surety bonds(a)
1,008 989 17 2 — — — 
Financing trust guarantees378  — — — — — 378 
Guaranteed lease residual values(b)
31 — 5 6 6 5 9 
Total commercial commitments $3,814  $3,285  $123  $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.
Schedule of Government Settlement Agreements [Table Text Block] As of December 31, 2021 and 2020, 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, 2021December 31, 2020
DOE receivable - current(a)
$241 $129 
DOE receivable - noncurrent(b)
85 70 
Amounts owed to co-owners(c)
(35)(23)
__________
(a)Recorded in Other accounts receivable.
(b)Recorded in Deferred debits and other assets, other.
(c)Recorded in Other accounts receivable. Represents amounts owed to the co-owners of Peach Bottom, Quad Cities, and Nine Mile Point Unit 2 generating facilities.
Spent Nuclear Fuel Obligation [Table Text Block] The below table outlines the SNF liability recorded at Exelon as of December 31, 2021 and 2020:
December 31, 2021December 31, 2020
Former ComEd units(a)
$1,083 $1,082 
Fitzpatrick(b)
127 126 
Total SNF Obligation$1,210 $1,208 
__________
(a)ComEd previously elected to defer payment of the one-time fee of $277 million for its units (which are now part of Generation), with interest to the date of payment, until just prior to the first delivery of SNF to the DOE. The unfunded liabilities for SNF disposal costs, including the one-time fee, were transferred to Generation as part of Exelon’s 2001 corporate restructuring.
(b)A prior owner of FitzPatrick elected to defer payment of the one-time fee of $34 million, with interest to the date of payment, for the FitzPatrick unit. As part of the FitzPatrick acquisition on March 31, 2017, Generation assumed a SNF liability for the DOE one-time fee obligation with interest related to FitzPatrick along with an offsetting asset, included in Other deferred debits and other assets, for the contractual right to reimbursement from NYPA, a prior owner of FitzPatrick, for amounts paid for the FitzPatrick DOE one-time fee obligation.
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$469 $303 $483 $314 
ComEd279 279 293 293 
PECO22 20 23 21 
BGE6 4 2 — 
PHI 42 — 44 — 
Pepco40 — 42 — 
DPL1 — 1 — 
ACE1 — 1 —