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Accounts Receivable (All Registrants)
 12 Months Ended
Dec. 31, 2021
Credit Loss [Abstract]  
Accounts Receivable (All Registrants) Accounts Receivable (All Registrants)
Allowance for Credit Losses on Accounts Receivable
The following tables present the rollforward of Allowance for Credit Losses on Customer Accounts Receivable.
Year Ended December 31, 2021
ExelonComEdPECOBGEPHIPepcoDPLACE
Balance as of December 31, 2020$334 $97 $116 $35 $86 $32 $22 $32 
Plus: Current period provision for expected credit losses(a)
96 21 23 15 37 13 6 18 
Less: Write-offs, net of recoveries(b)(c)
110 45 34 12 19 8 10 1 
Balance as of December 31, 2021$320 $73 $105 $38 $104 $37 $18 $49 
Year Ended December 31, 2020
ExelonComEdPECOBGEPHIPepcoDPLACE
Balance as of December 31, 2019$163 $59 $55 $12 $37 $13 $11 $13 
Plus: Current period provision for expected credit losses(d)
235 62 79 30 64 24 15 25 
Less: Write-offs, net of recoveries(c)
64 24 18 7 15 5 4 6 
Balance as of December 31, 2020$334 $97 $116 $35 $86 $32 $22 $32 
_________
(a)The increase is primarily a result of increased aging of receivables.
(b)For ComEd, PECO and DPL, the increase in 2021 is primarily related to the termination of the moratorium which, beginning in March 2020, prevented customer disconnections for non-payment. With disconnection activities restarting in 2021, write-offs of aging accounts receivable increased throughout the year.
(c)Recoveries were not material to the Registrants.
(d)The increase is primarily as a result of increased aging of receivables, the temporary suspension of customer disconnections for non-payment, temporary cessation of new late payment fees, and reconnection of service to customers previously disconnected due to COVID-19.
The following tables present the rollforward of Allowance for Credit Losses on Other Accounts Receivable.
Year Ended December 31, 2021
ExelonComEdPECOBGEPHIPepcoDPLACE
Balance as of December 31, 2020$71 $21 $8 $9 $33 $13 $9 $11 
Plus: Current period provision for expected credit losses11 (2)3 4 6 3 (1)4 
Less: Write-offs, net of recoveries(a)
10 2 4 4 — — — — 
Balance as of December 31, 2021$72 $17 $7 $9 $39 $16 $8 $15 
Year Ended December 31, 2020
ExelonComEdPECOBGEPHIPepcoDPLACE
Balance as of December 31, 2019$48 $20 $7 $5 $16 $7 $4 $5 
Plus: Current period provision for expected credit losses33 5 3 7 18 6 5 7 
Less: Write-offs, net of recoveries(a)
10 4 2 3 1 — — 1 
Balance as of December 31, 2020$71 $21 $8 $9 $33 $13 $9 $11 
_________
(a)Recoveries were not material to the Registrants.
Unbilled Customer Revenue
The following table provides additional information about unbilled customer revenues recorded in the Registrants' Consolidated Balance Sheets as of December 31, 2021 and 2020.
Unbilled customer revenues(a)
ExelonComEdPECOBGEPHIPepcoDPLACE
December 31, 2021$747 $240 $161 $171 $175 $82 $53 $40 
December 31, 2020740 218 147 197 178 87 62 29 
_________
(a)Unbilled customer revenues are classified in Customer accounts receivables, net in the Registrants' Consolidated Balance Sheets.

Other Purchases of Customer and Other Accounts Receivables
The Utility Registrants are required, under separate legislation and regulations in Illinois, Pennsylvania, Maryland, District of Columbia, and New Jersey, to purchase certain receivables from alternative retail electric and, as applicable, natural gas suppliers that participate in the utilities' consolidated billing. The following tables present the total receivables purchased and sold.
Year Ended December 31, 2021
ExelonComEdPECOBGEPHIPepcoDPLACE
Total receivables purchased$3,840 $1,031 $1,041 $687 $1,081 $660 $217 $204 
Related party transactions:
Receivables purchased from Generation— 1 1 21 — — — — 
Year Ended December 31, 2020
ExelonComEdPECOBGEPHIPepcoDPLACE
Total receivables purchased$3,781 $1,094 $1,020 $652 $1,015 $622 $207 $186 
Related party transactions:
Receivables purchased from Generation— 34 67 79 72 51 13 8