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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
Exelon Corporation and Subsidiary Companies 
Schedule II – Valuation and Qualifying Accounts
Column AColumn BColumn CColumn DColumn E
Additions and adjustments
DescriptionBalance at
Beginning
of Period		Charged to
Costs and
Expenses		Charged
to Other
Accounts		DeductionsBalance at
End
of Period
(In millions)
For the year ended December 31, 2020
Allowance for credit losses(a)
$294 

$240 
(b)
$(18)
(c)
$79 
(d)
$437 
Deferred tax valuation allowance26 

— 

1 

— 27 
Reserve for obsolete materials155 

128 
(e)
(1)6 276 
For the year ended December 31, 2019



Allowance for credit losses(a)
$319 

$119 
(b)
$26 $170 
(d)
$294 
Deferred tax valuation allowance35 

— 

(9)

— 26 
Reserve for obsolete materials156 

6 

— 7 155 
For the year ended December 31, 2018



Allowance for credit losses(a)
$322 

$159 
(b)
$35 $197 
(d)
$319 
Deferred tax valuation allowance37 

— 

5 7 35 
Reserve for obsolete materials174 

25 

(31)
(f)
12 156 
__________
(a)Excludes the non-current allowance for credit losses related to PECO’s installment plan receivables of $5 million, $9 million, and $13 million for the years ended December 31, 2020, 2019, and 2018, respectively.
(b)The amount charged to costs and expenses includes the amount that was reclassified to regulatory assets/liabilities under different mechanisms applicable to the different jurisdictions the Utility Registrants operate in.
(c)Includes a decrease related to the sale of customer accounts receivable at Generation in the second quarter of 2020. See Note 6—Accounts Receivable of the Combined Notes to Consolidated Financial Statements for additional information.
(d)Primarily reflects write-offs, net of recoveries of individual accounts receivable.
(e)Primarily reflects expense resulting from materials and supplies inventory reserve adjustments as a result of the decision to early retire Byron, Dresden, and Mystic 8 and 9. See Note 7—Early Plant Retirements of the Combined Notes to Consolidated Financial Statements for additional information.
(f)Primarily reflects the reclassification of assets as held for sale at Generation.
Exelon Generation Company, LLC and Subsidiary Companies
(2) Generation
(i)Financial Statements (Item 8):
Report of Independent Registered Public Accounting Firm dated February 24, 2021 of PricewaterhouseCoopers LLP
Consolidated Statements of Operations and Comprehensive Income for the Years Ended December 31, 2020, 2019, and 2018
Consolidated Statements of Cash Flows for the Years Ended December 31, 2020, 2019, and 2018
Consolidated Balance Sheets at December 31, 2020 and 2019
Consolidated Statements of Changes in Equity for the Years Ended December 31, 2020, 2019, and 2018
Notes to Consolidated Financial Statements
(ii)Financial Statement Schedule:
Schedule II—Valuation and Qualifying Accounts for the Years Ended December 31, 2020, 2019, and 2018
Schedules not included are omitted because of the absence of conditions under which they are required or because the required information is provided in the consolidated financial statements, including the notes thereto
Exelon Generation Company, LLC and Subsidiary Companies
Schedule II – Valuation and Qualifying Accounts
Column AColumn BColumn CColumn DColumn E
Additions and adjustments
DescriptionBalance at
Beginning
of Period		Charged to
Costs and
Expenses		Charged
to Other
Accounts		DeductionsBalance at
End
of Period
(In millions)
For the year ended December 31, 2020
Allowance for credit losses$81 

$12 

$(56)
(a)
$5 
(b)
$32 
Deferred tax valuation allowance24 

— 

(1) — 23 
Reserve for obsolete materials143 

123 
(c)
(1)

— 265 
For the year ended December 31, 2019



Allowance for credit losses$104 

$27 

$(11)$39 
(b)
$81 
Deferred tax valuation allowance26 

— 

(2)— 24 
Reserve for obsolete materials145 

— 

— 2 143 
For the year ended December 31, 2018



Allowance for credit losses$114 

$44 

$4 

$58 
(b)
$104 
Deferred tax valuation allowance23 — 3 — 26 
Reserve for obsolete materials166 

20 

(32)
(d)
9 145 
__________
(a)Reflects the sale of customer accounts receivable at Generation in the second quarter of 2020. See Note 6—Accounts Receivable of the Combined Notes to Consolidated Financial Statements for additional information.
(b)Write-offs, net of recoveries of individual accounts receivable.
(c)Primarily reflects expense resulting from materials and supplies inventory reserve adjustments as a result of the decision to early retire Byron, Dresden, and Mystic 8 and 9. See Note 7—Early Plant Retirements of the Combined Notes to Consolidated Financial Statements for additional information.
(d)Primarily reflects the reclassification of assets as held for sale.
Commonwealth Edison Company and Subsidiary Companies
(3) ComEd
(i)Financial Statements (Item 8):
Report of Independent Registered Public Accounting Firm dated February 24, 2021 of PricewaterhouseCoopers LLP
Consolidated Statements of Operations and Comprehensive Income for the Years Ended December 31, 2020, 2019, and 2018
Consolidated Statements of Cash Flows for the Years Ended December 31, 2020, 2019, and 2018
Consolidated Balance Sheets at December 31, 2020 and 2019
Consolidated Statements of Changes in Shareholders’ Equity for the Years Ended December 31, 2020, 2019, and 2018
Notes to Consolidated Financial Statements
(ii)Financial Statement Schedule:
Schedule II—Valuation and Qualifying Accounts for the Years Ended December 31, 2020, 2019, and 2018
Schedules not included are omitted because of the absence of conditions under which they are required or because the required information is provided in the consolidated financial statements, including the notes thereto
Commonwealth Edison Company and Subsidiary Companies
Schedule II – Valuation and Qualifying Accounts
Column AColumn BColumn CColumn DColumn E
Additions and adjustments
DescriptionBalance at
Beginning
of Period		Charged to
Costs and
Expenses		Charged
to Other
Accounts		DeductionsBalance at
End
of Period
(In millions)
For the year ended December 31, 2020
Allowance for credit losses$79 $54 
(a)
$13 $28 
(b)
$118 
Reserve for obsolete materials7 3 — 

4 6 
For the year ended December 31, 2019

Allowance for credit losses$81 $35 
(a)
$20 $57 
(b)
$79 
Reserve for obsolete materials6 6 — 

5 7 
For the year ended December 31, 2018

Allowance for credit losses$73 $44 
(a)
$23 $59 
(b)
$81 
Reserve for obsolete materials5 3 

1 

3 6 
__________
(a)ComEd is allowed to recover from or refund to customers the difference between its annual credit loss expense and the amounts collected in rates annually through a rider mechanism. The amount charged to costs and expenses includes the amount that was reclassified to regulatory assets/liabilities under such mechanism. See Note 3 – Regulatory Matters of the Combined Notes to Consolidated Financial Statements for additional information.
(b)Write-offs, net of recoveries of individual accounts receivable.
PECO Energy Company and Subsidiary Companies
(4) PECO
(i)Financial Statements (Item 8):
Report of Independent Registered Public Accounting Firm dated February 24, 2021 of PricewaterhouseCoopers LLP
Consolidated Statements of Operations and Comprehensive Income for the Years Ended December 31, 2020, 2019, and 2018
Consolidated Statements of Cash Flows for the Years Ended December 31, 2020, 2019, and 2018
Consolidated Balance Sheets at December 31, 2020 and 2019
Consolidated Statements of Changes in Shareholder's Equity for the Years Ended December 31, 2020, 2019, and 2018
Notes to Consolidated Financial Statements
(ii)Financial Statement Schedule:
Schedule II—Valuation and Qualifying Accounts for the Years Ended December 31, 2020, 2019, and 2018
Schedules not included are omitted because of the absence of conditions under which they are required or because the required information is provided in the consolidated financial statements, including the notes thereto
PECO Energy Company and Subsidiary Companies
Schedule II – Valuation and Qualifying Accounts
Column AColumn BColumn CColumn DColumn E
  Additions and adjustments
DescriptionBalance at
Beginning
of Period		Charged to
Costs and
Expenses		Charged
to Other
Accounts		DeductionsBalance at
End
of Period
(In millions)
For the year ended December 31, 2020
Allowance for credit losses(a)
$62 

$76 
(b) 
$6 $20 
(c)
$124 
Deferred tax valuation allowance— — 1 — $1 
Reserve for obsolete materials2 

1 — 1 2 
For the year ended December 31, 2019

Allowance for credit losses(a)
$61 

$31 $3 $33 
(c)
$62 
Reserve for obsolete materials2 

— — — 2 
For the year ended December 31, 2018

Allowance for credit losses(a)
$56 

$33 $3 $31 
(c)
$61 
Reserve for obsolete materials2 

— 

— 

— 2 
__________
(a)Excludes the non-current allowance for credit losses related to PECO’s installment plan receivables of $5 million, $9 million, and $13 million for the years ended December 31, 2020, 2019, and 2018, respectively.
(b)The amount charged to costs and expenses includes the amount that was reclassified to the COVID-19 regulatory asset. See Note 3 – Regulatory Matters of the Combined Notes to Consolidated Financial Statements for additional information.
(c)Write-offs, net of recoveries of individual accounts receivable.
Baltimore Gas and Electric Company
(5) BGE
(i)Financial Statements (Item 8):
Report of Independent Registered Public Accounting Firm dated February 24, 2021 of PricewaterhouseCoopers LLP
Statements of Operations and Comprehensive Income for the Years Ended December 31, 2020, 2019 and 2018
Statements of Cash Flows for the Years Ended December 31, 2020, 2019 and 2018
Balance Sheets at December 31, 2020 and 2019
Statements of Changes in Shareholder's Equity for the Years Ended December 31, 2020, 2019 and 2018
Notes to Financial Statements
(ii)Financial Statement Schedule:
Schedule II—Valuation and Qualifying Accounts for the Years Ended December 31, 2020, 2019, and 2018
Schedules not included are omitted because of the absence of conditions under which they are required or because the required information is provided in the consolidated financial statements, including the notes thereto
Baltimore Gas and Electric Company
Schedule II – Valuation and Qualifying Accounts
Column AColumn BColumn CColumn DColumn E
Additions and adjustments
DescriptionBalance at
Beginning
of Period		Charged to
Costs and
Expenses		Charged
to Other
Accounts		DeductionsBalance at
End
of Period
(In millions)
For the year ended December 31, 2020
Allowance for credit losses$17 

$31 
(a)
$6 

$10 
(b)
$44 
Deferred tax valuation allowance1 

— (1)

— — 
Reserve for obsolete materials1 

— — 

— 1 
For the year ended December 31, 2019


Allowance for credit losses$20 

$8 
(a)
$7 

$18 
(b)
$17 
Deferred tax valuation allowance1 

— — 

— 1 
Reserve for obsolete materials1 

— — 

— 1 
For the year ended December 31, 2018


Allowance for credit losses$24 

$10 
(a)
$(2)

$12 
(b)
$20 
Deferred tax valuation allowance1 — — — 1 
Reserve for obsolete materials— 1 — — 1 
__________
(a)The amount charged to costs and expenses includes the amount that was reclassified to regulatory assets/liabilities under different mechanisms as approved by the MDPSC.
(b)Write-offs, net of recoveries of individual accounts receivable.
Pepco Holdings LLC and Subsidiary Companies
(6) PHI
(i)Financial Statements (Item 8):
Report of Independent Registered Public Accounting Firm dated February 24, 2021 of PricewaterhouseCoopers LLP
Consolidated Statements of Operations and Comprehensive Income for the Years Ended December 31, 2020, 2019, and 2018
Consolidated Statements of Cash Flows for the Years Ended December 31, 2020, 2019, and 2018
Consolidated Balance Sheets at December 31, 2020 and 2019
Consolidated Statements of Changes in Equity for the Years Ended December 31, 2020, 2019, and 2018
Notes to Consolidated Financial Statements
(ii)Financial Statement Schedule:
Schedule II—Valuation and Qualifying Accounts for the Years Ended December 31, 2020, 2019, and 2018
Schedules not included are omitted because of the absence of conditions under which they are required or because the required information is provided in the consolidated financial statements, including the notes thereto
Pepco Holdings LLC and Subsidiary Companies
Schedule II – Valuation and Qualifying Accounts
Column AColumn BColumn CColumn DColumn E
Additions and adjustments
DescriptionBalance at
Beginning
of Period		Charged to
Costs and
Expenses		Charged
to Other
Accounts		DeductionsBalance at
End
of Period
(In millions)
For the year ended December 31, 2020
Allowance for credit losses$53 $69 
(a)
$13 $16 
(b)
$119 
Reserve for obsolete materials3 — — 1 2 
For the year ended December 31, 2019
Allowance for credit losses$53 $17 
(a)
$7 $24 
(c)
$53 
Deferred tax valuation allowance8 — (8)— — 
Reserve for obsolete materials2 1 — — 3 
For the year ended December 31, 2018
Allowance for credit losses$55 $28 
(a)
$7 $37 
(c)
$53 
Deferred tax valuation allowance13 — 2 7 8 
Reserve for obsolete materials2 — — — 2 
__________
(a)The amount charged to costs and expenses includes the amount that was reclassified to regulatory assets/liabilities under different mechanisms applicable to the different jurisdictions Pepco, DPL, and ACE operate in.
(b)Write-offs, net of recoveries of individual accounts receivable.
(c)Write-offs of individual accounts receivable.
Potomac Electric Power Company
(7) Pepco
(i)Financial Statements (Item 8):
Report of Independent Registered Public Accounting Firm dated February 24, 2021 of PricewaterhouseCoopers LLP
Statements of Operations and Comprehensive Income for the Years Ended December 31, 2020, 2019 and 2018
Statements of Cash Flows for the Years Ended December 31, 2020, 2019 and 2018
Balance Sheets at December 31, 2020 and 2019
Statements of Changes in Shareholder's Equity for the Years Ended December 31, 2020, 2019 and 2018
Notes to Financial Statements
(ii)Financial Statement Schedule:
Schedule II—Valuation and Qualifying Accounts for the Years Ended December 31, 2020, 2019, and 2018
Schedules not included are omitted because of the absence of conditions under which they are required or because the required information is provided in the consolidated financial statements, including the notes thereto
Potomac Electric Power Company
Schedule II – Valuation and Qualifying Accounts
Column AColumn BColumn CColumn DColumn E
Additions and adjustments
DescriptionBalance at
Beginning
of Period		Charged to
Costs and
Expenses		Charged
to Other
Accounts		DeductionsBalance at
End
of Period
(In millions)
For the year ended December 31, 2020
Allowance for credit losses$20 $25 
(a)
$5 $5 
(b)
$45 
Reserve for obsolete materials1 — — — 1 
For the year ended December 31, 2019
Allowance for credit losses$21 $7 
(a)
$2 $10 
(c)
$20 
Reserve for obsolete materials1 — — — 1 
For the year ended December 31, 2018
Allowance for credit losses$21 $11 
(a)
$3 $14 
(c)
$21 
Reserve for obsolete materials1 — — — 1 
__________
(a)The amount charged to costs and expenses includes the amount that was reclassified to regulatory assets/liabilities under different mechanisms as approved by the DCPSC and MDPSC.
(b)Write-offs, net of recoveries of individual accounts receivable.
(c)Write-off of individual accounts receivable.
Delmarva Power & Light Company
(8) DPL
(i)Financial Statements (Item 8):
Report of Independent Registered Public Accounting Firm dated February 24, 2021 of PricewaterhouseCoopers LLP
Statements of Operations and Comprehensive Income for the Years Ended December 31, 2020, 2019 and 2018
Statements of Cash Flows for the Years Ended December 31, 2020, 2019 and 2018
Balance Sheets at December 31, 2020 and 2019
Statements of Changes in Shareholder's Equity for the Years Ended December 31, 2020, 2019 and 2018
Notes to Financial Statements
(ii)Financial Statement Schedule:
Schedule II—Valuation and Qualifying Accounts for the Years Ended December 31, 2020, 2019, and 2018
Schedules not included are omitted because of the absence of conditions under which they are required or because the required information is provided in the consolidated financial statements, including the notes thereto
Delmarva Power & Light Company
Schedule II – Valuation and Qualifying Accounts
Column AColumn BColumn CColumn DColumn E
Additions and adjustments
DescriptionBalance at
Beginning
of Period		Charged to
Costs and
Expenses		Charged
to Other
Accounts		DeductionsBalance at
End
of Period
(In millions)
For the year ended December 31, 2020
Allowance for credit losses$15 $16 
(a)
$4 $4 
(b)
$31 
For the year ended December 31, 2019
Allowance for credit losses$13 $4 
(a)
$3 $5 
(c)
$15 
For the year ended December 31, 2018
Allowance for credit losses$16 $6 
(a)
$2 $11 
(c)
$13 
__________
(a)The amount charged to costs and expenses includes the amount that was reclassified to regulatory assets/liabilities under different mechanisms as approved by the DPSC and MDPSC.
(b)Write-offs, net of recoveries of individual accounts receivable.
(c)Write-off of individual accounts receivable.
Atlantic City Electric Company and Subsidiary Company
(9) ACE
(i)Financial Statements (Item 8):
Report of Independent Registered Public Accounting Firm dated February 24, 2021 of PricewaterhouseCoopers LLP
Consolidated Statements of Operations and Comprehensive Income for the Years Ended December 31, 2020, 2019, and 2018
Consolidated Statements of Cash Flows for the Years Ended December 31, 2020, 2019, and 2018
Consolidated Balance Sheets at December 31, 2020 and 2019
Consolidated Statements of Changes in Shareholder's Equity for the Years Ended December 31, 2020, 2019, and 2018
Notes to Consolidated Financial Statements
(ii)Financial Statement Schedule:
Schedule II—Valuation and Qualifying Accounts for the Years Ended December 31, 2020, 2019, and 2018
Schedules not included are omitted because of the absence of conditions under which they are required or because the required information is provided in the consolidated financial statements, including the notes thereto
Atlantic City Electric Company and Subsidiary Company
Schedule II – Valuation and Qualifying Accounts
Column AColumn BColumn CColumn DColumn E
Additions and adjustments
DescriptionBalance at
Beginning
of Period		Charged to
Costs and
Expenses		Charged
to Other
Accounts		DeductionsBalance at
End
of Period
(In millions)
For the year ended December 31, 2020
Allowance for credit losses$18 $28 
(a)
$4 $7 
(b)
$43 
Reserve for obsolete materials1 — — 1 — 
For the year ended December 31, 2019
Allowance for credit losses$19 $5 
(a)
$2 $8 
(c)
$18 
Reserve for obsolete materials1 — — — 1 
For the year ended December 31, 2018
Allowance for credit losses$18 $11 
(a)
$2 $12 
(c)
$19 
Reserve for obsolete materials1 — — — 1 
__________
(a)ACE is allowed to recover from or refund to customers the difference between its annual credit loss expense and the amounts collected in rates annually through the Societal Benefits Charge. The amount charged to costs and expenses includes the amount that was reclassified to regulatory assets/liabilities under such mechanism. See Note 3 – Regulatory Matters of the Combined Notes to Consolidated Financial Statements for additional information.
(b)Write-offs, net of recoveries of individual accounts receivable.
(c)Write-off of individual accounts receivable.