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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2018
Commitments and Contingencies [Line Items] |
Other Commitments | Commercial Commitments (All Registrants). Exelon’s commercial commitments as of December 31, 2018, representing commitments potentially triggered by future events, were as follows:
|  |  | Expiration within
| Total | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 and beyond
Letters of credit | $ | 1,703 |  |  | $ | 1,394 |  |  | $ | 308 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Surety bonds(a) | 1,402 |  |  | 1,331 |  |  | 33 |  |  | 38 |  |  | — |  |  | — |  |  | — |
Financing trust guarantees | 378 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 378 |
Guaranteed lease residual values(b) | 24 |  |  | 3 |  |  | 3 |  |  | 2 |  |  | 3 |  |  | 3 |  |  | 10 |
Total commercial commitments | $ | 3,507 |  |  | $ | 2,728 |  |  | $ | 344 |  |  | $ | 41 |  |  | $ | 3 |  |  | $ | 3 |  |  | $ | 388 |
__________
(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 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 $61 million, $19 million of which is a guarantee by Pepco, $26 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.
Generation’s commercial commitments as of December 31, 2018, representing commitments potentially triggered by future events, were as follows:
|  |  | Expiration within
| Total | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 and beyond
Letters of credit | $ | 1,680 |  |  | $ | 1,380 |  |  | $ | 299 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Surety bonds(a) | 1,220 |  |  | 1,201 |  |  | 19 |  |  | — |  |  | — |  |  | — |  |  | — |
Total commercial commitments | $ | 2,900 |  |  | $ | 2,581 |  |  | $ | 318 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
__________
(a) | Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds.
ComEd’s commercial commitments as of December 31, 2018, representing commitments potentially triggered by future events, were as follows:
|  |  | Expiration within
| Total | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 and beyond
Letters of credit | $ | 2 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Surety bonds(a) | 12 |  |  | 10 |  |  | — |  |  | 2 |  |  | — |  |  | — |  |  | — |
Financing trust guarantees | 200 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 200 |
Total commercial commitments | $ | 214 |  |  | $ | 12 |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |  |  | $ | 200 |
__________
(a) | Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds.
PECO’s commercial commitments as of December 31, 2018, representing commitments potentially triggered by future events, were as follows:
|  |  | Expiration within
| Total | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 and beyond
Surety bonds(a) | $ | 9 |  |  | $ | 9 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Financing trust guarantees | 178 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 178 |
Total commercial commitments | $ | 187 |  |  | $ | 9 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 178 |
__________
(a) | Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds.
BGE’s commercial commitments as of December 31, 2018, representing commitments potentially triggered by future events, were as follows:
|  |  | Expiration within
| Total | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 and beyond
Letters of credit | $ | 3 |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Surety bonds(a) | 17 |  |  | 3 |  |  | 14 |  |  | — |  |  | — |  |  | — |  |  | — |
Total commercial commitments | $ | 20 |  |  | $ | 5 |  |  | $ | 15 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
__________
(a) | Surety bonds—Guarantees issued related to contract and commercial agreements, excluding bid bonds.
PHI commercial commitments as of December 31, 2018, representing commitments potentially triggered by future events, were as follows:
|  |  | Expiration within
| Total | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 and beyond
Letters of credit | $ | 8 |  |  | $ | — |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Surety bonds(a) | $ | 41 |  |  | $ | 41 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Guaranteed lease residual values(b) | 24 |  |  | 3 |  |  | 3 |  |  | 2 |  |  | 3 |  |  | 3 |  |  | 10 |
Total commercial commitments | $ | 73 |  |  | $ | 44 |  |  | $ | 11 |  |  | $ | 2 |  |  | $ | 3 |  |  | $ | 3 |  |  | $ | 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 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 $61 million. 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.
Pepco commercial commitments as of December 31, 2018, representing commitments potentially triggered by future events, were as follows:
|  |  | Expiration within
| Total | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 and beyond
Letters of credit | $ | 8 |  |  | $ | — |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Surety bonds(a) | $ | 33 |  |  | $ | 33 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Guaranteed lease residual values(b) | 8 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 3 |
Total commercial commitments | $ | 49 |  |  | $ | 34 |  |  | $ | 9 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 3 |
__________
(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 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 $19 million. The minimum lease term associated with these assets ranges from 1 to 4 years. Historically, payments under the guarantees have not been made and Pepco believes the likelihood of payments being required under the guarantees is remote.
DPL commercial commitments as of December 31, 2018, representing commitments potentially triggered by future events, were as follows:
|  |  | Expiration within
| Total | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 and beyond
Surety bonds(a) | $ | 5 |  |  | $ | 5 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Guaranteed lease residual values(b) | 10 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 5 |
Total commercial commitments | $ | 15 |  |  | $ | 6 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 5 |
__________
(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 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 $26 million. The minimum lease term associated with these assets ranges from 1 to 4 years. Historically, payments under the guarantees have not been made and DPL believes the likelihood of payments being required under the guarantees is remote.
ACE commercial commitments as of December 31, 2018, representing commitments potentially triggered by future events, were as follows:
|  |  | Expiration within
| Total | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 and beyond
Surety bonds(a) | $ | 3 |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Guaranteed lease residual values(b) | 6 |  |  | 1 |  |  | 1 |  |  | — |  |  | 1 |  |  | 1 |  |  | 2 |
Total commercial commitments | $ | 9 |  |  | $ | 4 |  |  | $ | 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 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 $16 million. The minimum lease term associated with these assets ranges from 1 to 4 years. Historically, payments under the guarantees have not been made and ACE believes the likelihood of payments being required under the guarantees is remot
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] | mum 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 $16 million. The minimum lease term associated with these assets ranges from 1 to 4 years. Historically, payments under the guarantees have not been made and ACE believes the likelihood of payments being required under the guarantees is remote. Leases (All Registrants) Minimum future operating lease payments, including lease payments for contracted generation, vehicles, real estate, computers, rail cars, operating equipment and office equipment, as of December 31, 2018 were:
| Exelon(a)(b) |  | Generation(a)(b) |  | ComEd(a)(c) |  | PECO(a)(c) |  | BGE(a)(c)(d)(e) |  | PHI(a) |  | Pepco(a) |  | DPL(a)(c) |  | ACE(a)
2019 | $ | 140 |  |  | $ | 33 |  |  | $ | 7 |  |  | $ | 5 |  |  | $ | 35 |  |  | $ | 48 |  |  | $ | 11 |  |  | $ | 14 |  |  | $ | 7 |
2020 | 149 |  |  | 46 |  |  | 5 |  |  | 5 |  |  | 35 |  |  | 46 |  |  | 10 |  |  | 13 |  |  | 6 |
2021 | 143 |  |  | 46 |  |  | 4 |  |  | 5 |  |  | 33 |  |  | 43 |  |  | 9 |  |  | 12 |  |  | 5 |
2022 | 126 |  |  | 47 |  |  | 4 |  |  | 5 |  |  | 18 |  |  | 42 |  |  | 8 |  |  | 12 |  |  | 5 |
2023 | 97 |  |  | 46 |  |  | 3 |  |  | 5 |  |  | 3 |  |  | 39 |  |  | 8 |  |  | 10 |  |  | 4 |
Remaining years | 723 |  |  | 545 |  |  | — |  |  | — |  |  | 19 |  |  | 159 |  |  | 40 |  |  | 35 |  |  | 5 |
Total minimum future lease payments | $ | 1,378 |  |  | $ | 763 |  |  | $ | 23 |  |  | $ | 25 |  |  | $ | 143 |  |  | $ | 377 |  |  | $ | 86 |  |  | $ | 96 |  |  | $ | 32 |
__________
(a) | Includes amounts related to shared use land arrangements.
(b) | Excludes Generation’s contingent operating lease payments associated with contracted generation agreements.
(c) | Amounts related to certain real estate leases and railroad licenses effectively have indefinite payment periods. As a result, ComEd, PECO, BGE and DPL have excluded these payments from the remaining years as such amounts would not be meaningful. ComEd's, PECO’s, BGE’s and DPL's average annual obligation for these arrangements, included in each of the years 2019 - 2023, was $3 million, $5 million, $1 million and $1 million respectively. Also includes amounts related to shared use land arrangements.
(d) | Includes all future lease payments on a 99-year real estate lease that expires in 2106.
(e) | The BGE column above includes minimum future lease payments associated with a 6-year lease for the Baltimore City conduit system that became effective during the fourth quarter of 2016. BGE's total commitments under the lease agreement are $26 million, $28 million, $28 million and $14 million related to years 2019 - 2022
Accrued environmental liabilities | . As of December 31, 2018 and 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:
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 |  |  | — |
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(b) | $ | 1,274 |  |  | $ | 1,100 |
__________
(a) | Total after considering amounts due to co-owners of certain nuclear stations and to the former owner of Oyster Creek.
(b) | Includes $53 and $49, respectively, for amounts received since April 1, 2014, for costs incurred under the CENG DOE Settlement Agreements prior to the consolidation of CENG.
As of December 31, 2018 and 2017, 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, 2018 |  |  | December 31, 2017 |
DOE receivable - current(a) | $ | 124 |  |  | $ | 94 |
DOE receivable - noncurrent(b) | 15 |  |  | 15 |
Amounts owed to co-owners(a)(c) | (17 | ) |  | (11 | )
__________
(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

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