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Leases (All Registrants)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Leases of Lessee Disclosure [Text Block]
Lessee
The Registrants have operating and finance leases for which they are the lessees. The following tables outline the significant types of leases at each registrant and other terms and conditions of the lease agreements as of December 31, 2020. Exelon, Generation, ComEd, PECO, and BGE did not have material finance leases in 2020 or in 2019. PHI, Pepco, DPL, and ACE also did not have material finance leases in 2019.
Exelon GenerationComEdPECOBGE PHIPepcoDPLACE
Contracted generation●●
Real estate●●●●●●●●●
Vehicles and equipment●●●●●●●●●
(in years)Exelon GenerationComEdPECOBGE PHIPepcoDPLACE
Remaining lease terms1-851-351-41-131-851-111-111-111-7
Options to extend the term2-302-305N/AN/A3-3053-305
Options to terminate within1-121-42N/A1N/AN/AN/AN/A
The components of operating lease costs were as follows:
Exelon GenerationComEdPECOBGE PHIPepcoDPLACE
For the year ended December 31, 2020
Operating lease costs$292 $194 $3 $1 $33 $46 $11 $13 $6 
Variable lease costs241 234 1 — 1 2 1 1 — 
Short-term lease costs2 2 — — — — — — — 
Total lease costs (a)
$535 $430 $4 $1 $34 $48 $12 $14 $6 
For the year ended December 31, 2019
Operating lease costs$320 $222 $3 $1 $33 $48 $12 $14 $7 
Variable lease costs300 282 2 — 2 6 2 2 1 
Short-term lease costs19 19 — — — — — — — 
Total lease costs (a)
$639 $523 $5 $1 $35 $54 $14 $16 $8 
__________
(a)Excludes $48 million, $44 million, $4 million, and $4 million of sublease income recorded at Exelon, Generation, PHI, and DPL, respectively, for the year ended December 31, 2020 and $51 million, $44 million, $7 million, and $7 million of sublease income recorded at Exelon, Generation, PHI, and DPL, respectively, for the year ended December 31, 2019.
PHI, Pepco, DPL, and ACE recorded finance lease costs of $9 million, $3 million, $4 million, and $2 million, respectively, for the year ended December 31, 2020.
The following table presents the Registrants' rental expense under the prior lease accounting guidance for the year ended December 31, 2018:
Exelon 
Generation(a)
ComEdPECOBGE PHIPepcoDPLACE
Rent expense$670 $558 $7 $10 $35 $48 $10 $13 $8 
__________
(a)Includes contingent operating lease payments associated with contracted generation agreements that are not included in the minimum future operating lease payments table. Payments made under Generation's contracted generation lease agreements totaled $493 million.
The following tables provide additional information regarding the presentation of operating and finance lease ROU assets and lease liabilities within the Registrants’ Consolidated Balance Sheets:
Operating Leases
Exelon(a)
 
Generation(a)
ComEdPECOBGE PHIPepcoDPLACE
As of December 31, 2020
Operating lease ROU assets
Other deferred debits and other assets$1,064 $726 $7 $1 $46 $241 $49 $54 $15 
Operating lease liabilities
Other current liabilities213 132 3 — 45 31 6 9 4 
Other deferred credits and other liabilities1,089 775 5 1 19 224 46 56 11 
Total operating lease liabilities$1,302 $907 $8 $1 $64 $255 $52 $65 $15 
As of December 31, 2019
Operating lease ROU assets
Other deferred debits and other assets$1,305 $895 $9 $2 $77 $273 $56 $63 $18 
Operating lease liabilities
Other current liabilities225 157 3 — 32 31 6 9 4 
Other deferred credits and other liabilities1,307 925 8 1 50 254 51 65 14 
Total operating lease liabilities$1,532 $1,082 $11 $1 $82 $285 $57 $74 $18 
__________
(a)Exelon's and Generation's operating ROU assets and lease liabilities include $387 million and $528 million, respectively, related to contracted generation as of December 31, 2020, and $515 million and $664 million, respectively, as of December 31, 2019.

Finance Leases
PHIPepcoDPLACE
As of December 31, 2020
Finance lease ROU assets
Plant, property and equipment, net$50 $17 $20 $13 
Finance lease liabilities
Long-term debt due within one year7 2 3 2 
Long-term debt43 15 17 11 
Total finance lease liabilities$50 $17 $20 $13 

The weighted average remaining lease terms, in years, for operating and finance leases were as follows:
Operating Leases
Exelon GenerationComEdPECOBGE PHIPepcoDPLACE
As of December 31, 202010.110.53.84.28.38.29.19.14.0
As of December 31, 201910.110.64.64.45.49.09.89.74.7
Finance Leases
PHIPepcoDPLACE
As of December 31, 20206.56.36.56.5
The weighted average discount rates for operating and finance leases were as follows:
Operating Leases
ExelonGenerationComEdPECOBGEPHIPepcoDPLACE
As of December 31, 20204.7 %4.9 %3.0 %2.9 %3.8 %4.2 %4.0 %4.0 %3.5 %
As of December 31, 20194.6 %4.8 %3.0 %3.2 %3.6 %4.2 %4.0 %4.0 %3.6 %

Finance Leases
PHIPepcoDPLACE
As of December 31, 20202.5 %2.6 %2.4 %2.4 %
Future minimum lease payments for operating and finance leases as of December 31, 2020 were as follows:
Operating Leases
YearExelon GenerationComEdPECOBGE PHIPepcoDPLACE
2021$239 $145 $3 $1 $46 $40 $8 $11 $5 
2022177 113 2 — 16 39 8 10 4 
2023146 100 1 — 1 38 7 9 3 
2024141 98 1 — — 36 6 8 2 
2025140 99 1 — — 33 6 7 2 
Remaining years834 640 — — 18 120 28 35 — 
Total1,677 1,195 8 1 81 306 63 80 16 
Interest375 288 — — 17 51 11 15 1 
Total operating lease liabilities$1,302 $907 $8 $1 $64 $255 $52 $65 $15 
Finance Leases
YearPHIPepcoDPLACE
2021$8 $3 $3 $2 
20228 3 3 2 
20238 3 3 2 
20248 3 3 2 
20258 3 3 2 
Remaining years13 3 6 4 
Total53 18 21 14 
Interest3 1 1 1 
Total finance lease liabilities$50 $17 $20 $13 
Cash paid for amounts included in the measurement of operating and finance lease liabilities were as follows:
Operating cash flows from operating leases
ExelonGenerationComEdPECOBGEPHIPepcoDPLACE
For the year ended December 31, 2020$271 $204 $3 $1 $20 $39 $8 $9 $4 
For the year ended December 31, 2019287 206 3 — 33 37 9 6 5 
Financing cash flows from finance leases
PHIPepcoDPLACE
For the year ended December 31, 2020$6 $2 $3 $1 
ROU assets obtained in exchange for operating and finance lease obligations were as follows:
Operating Leases
ExelonGenerationComEdPECOBGEPHIPepcoDPLACE
For the year ended December 31, 2020$1 $3 $— $1 $— $(1)$— $(1)$— 
For the year ended December 31, 201952 14 6 — 2 (3)(1)(2)(1)
Finance Leases
PHIPepcoDPLACE
For the year ended December 31, 2020$29 $8 $14 $7 
Leases of Lessor Disclosure [Text Block]
Lessor
The Registrants have operating leases for which they are the lessors. The following tables outline the significant types of leases at each registrant and other terms and conditions of their lease agreements as of December 31, 2020.
Exelon GenerationComEdPECOBGE PHIPepcoDPLACE
Contracted generation●●
Real estate●●●●●●●●●
(in years)Exelon GenerationComEdPECOBGE PHIPepcoDPLACE
Remaining lease terms1-821-311-161-82221-121-511-121
Options to extend the term1-791-55-795-50N/A5N/AN/AN/A
The components of lease income were as follows:
Exelon GenerationComEdPECOBGE PHIPepcoDPLACE
For the year ended December 31, 2020
Operating lease income$52 $47 $— $— $— $3 $— $3 $— 
Variable lease income283 282 — — — 1 — 1 — 
For the year ended December 31, 2019
Operating lease income$54 $47 $— $— $— $5 $— $4 $— 
Variable lease income261 258 — — — 3 — 3 — 
Future minimum lease payments to be recovered under operating leases as of December 31, 2020 were as follows:
YearExelon GenerationComEdPECOBGE PHIPepcoDPLACE
2021$51 $45 $— $— $— $4 $1 $3 $— 
202250 45 — — — 4 — 3 — 
202349 45 — — — 4 — 4 — 
202449 45 — — — 3 — 3 — 
202548 45 — — — 4 — 4 — 
Remaining years217 182 1 4 1 31 — 31 — 
Total $464 $407 $1 $4 $1 $50 $1 $48 $—