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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2019
Environmental Loss Contingency Tables [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, 2019:
Description
Exelon
 
PHI
 
Pepco
 
DPL
 
ACE
Total commitments
$
513

 
$
320

 
$
120

 
$
89

 
$
111

Remaining commitments(a)
$
101

 
$
79

 
$
65

 
$
8

 
$
6

_________
(a)
Remaining commitments extend through 2026 and include rate credits, energy efficiency programs and delivery system modernization.
Other Commitments [Table Text Block] The Registrants' commercial commitments as of December 31, 2019, representing commitments potentially triggered by future events, were as follows:
 
 
 
Expiration within
Exelon
Total
 
2020
 
2021
 
2022
 
2023
 
2024
 
2025 and beyond
Letters of credit
$
1,455

 
$
1,314

 
$
141

 
$
—

 
$
—

 
$
—

 
$
—

Surety bonds(a)
855

 
809

 
46

 
—

 
—

 
—

 
—

Financing trust guarantees
378

 
—

 
—

 
—

 
—

 
—

 
378

Guaranteed lease residual values(b)
26

 
2

 
2

 
4

 
3

 
6

 
10

Total commercial commitments
$
2,714

 
$
2,125

 
$
189

 
$
4

 
$
3

 
$
6

 
$
388

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Generation
 
 
 
 
 
 
 
 
 
 
 
 
 
Letters of credit
$
1,440

 
$
1,302

 
$
138

 
$
—

 
$
—

 
$
—

 
$
—

Surety bonds(a)
670

 
662

 
8

 
—

 
—

 
—

 
—

Total commercial commitments
$
2,110

 
$
1,964

 
$
146

 
$
—

 
$
—

 
$
—

 
$
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
ComEd
 
 
 
 
 
 
 
 
 
 
 
 
 
Letters of credit
$
7

 
$
7

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Surety bonds(a)
50

 
48

 
2

 
—

 
—

 
—

 
—

Financing trust guarantees
200

 
—

 
—

 
—

 
—

 
—

 
200

Total commercial commitments
$
257

 
$
55

 
$
2

 
$
—

 
$
—

 
$
—

 
$
200

 
 
 
 
 
 
 
 
 
 
 
 
 
 
PECO
 
 
 
 
 
 
 
 
 
 
 
 
 
Surety bonds(a)
$
9

 
$
9

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Financing trust guarantees
178

 
—

 
—

 
—

 
—

 
—

 
178

Total commercial commitments
$
187

 
$
9

 
$
—

 
$
—

 
$
—

 
$
—

 
$
178

 
 
 
 
 
 
 
 
 
 
 
 
 
 
BGE
 
 
 
 
 
 
 
 
 
 
 
 
 
Letters of credit
$
2

 
$
2

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Surety bonds(a)
3

 
3

 
—

 
—

 
—

 
—

 
—

Total commercial commitments
$
5

 
$
5

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
PHI
 
 
 
 
 
 
 
 
 
 
 
 
 
Surety bonds(a)
$
21

 
$
21

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Guaranteed lease residual values(b)
26

 
2

 
2

 
4

 
3

 
6

 
10

Total commercial commitments
$
47

 
$
23

 
$
2

 
$
4

 
$
3

 
$
6

 
$
10

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pepco
 
 
 
 
 
 
 
 
 
 
 
 
 
Surety bonds(a)
$
14

 
$
14

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Guaranteed lease residual values(b)
9

 
—

 
—

 
1

 
1

 
2

 
5

Total commercial commitments
$
23

 
$
14

 
$
—

 
$
1

 
$
1

 
$
2

 
$
5

 
 
 
 
 
 
 
 
 
 
 
 
 
 
DPL
 
 
 
 
 
 
 
 
 
 
 
 
 
Surety bonds(a)
$
4

 
$
4

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Guaranteed lease residual values(b)
11

 
1

 
1

 
2

 
1

 
3

 
3

Total commercial commitments
$
15

 
$
5

 
$
1

 
$
2

 
$
1

 
$
3

 
$
3

 
 
 
 
 
 
 
 
 
 
 
 
 
 
ACE
 
 
 
 
 
 
 
 
 
 
 
 
 
Surety bonds(a)
$
3

 
$
3

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Guaranteed lease residual values(b)
7

 
1

 
1

 
1

 
1

 
1

 
2

Total commercial commitments
$
10

 
$
4

 
$
1

 
$
1

 
$
1

 
$
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 $69 million guaranteed by Exelon and PHI, of which $23 million, $29 million and $18 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]
Under the settlement agreements, Generation has received cumulative cash reimbursements for costs incurred as follows:
 
Total
 
Net(a)
Cumulative cash reimbursements

$
1,288

 
$
1,113

__________
(a)
Total after considering amounts due to co-owners of certain nuclear stations and to the former owner of Oyster Creek.
As of December 31, 2019 and 2018, 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, 2019
 
December 31, 2018
DOE receivable - current(a)
$
249

 
$
124

DOE receivable - noncurrent(b)
30

 
15

Amounts owed to co-owners(a)(c)
(37
)
 
(17
)
__________
(a)
Recorded in Accounts receivable, other.
(b)
Recorded in Deferred debits and other assets, other.
(c)
Non-CENG amounts owed to co-owners are recorded in Accounts receivable, other.  CENG amounts owed to co-owners are recorded in Accounts payable. 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 and Generation as of December 31, 2019 and 2018:
 
December 31, 2019
 
December 31, 2018
Former ComEd units(a)
$
1,075

 
$
1,052

Fitzpatrick(b)
124

 
119

Total SNF Obligation
$
1,199

 
$
1,171

__________
(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, 2019 and 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:
 
December 31, 2019
 
December 31, 2018
 
Total environmental
investigation and
remediation reserve
 
Portion of total related to
MGP investigation and
remediation
 
Total environmental
investigation and
remediation reserve
 
Portion of total related to
MGP investigation and
remediation
Exelon
$
478

 
$
320

 
$
496

 
$
356

Generation
105

 
—

 
108

 
—

ComEd
304

 
303

 
329

 
327

PECO
19

 
17

 
27

 
25

BGE
2

 
—

 
5

 
4

PHI
48

 
—

 
27

 
—

Pepco
46

 
—

 
25

 
—

DPL
1

 
—

 
1

 
—

ACE
1

 
—

 
1

 
—