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Credit Losses on Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2021
Credit Loss [Abstract]  
Financing Receivable, Allowance for Credit Loss
The following tables presents the activity of our allowance for credit losses for our accounts receivable portfolio for the years ended December 31, 2021 and December 31, 2020:

BusinessMass MarketsTotal
(Dollars in millions)
Beginning balance at January 1, 2021(2)
$25 36 61 
Provision for expected losses10 17 27 
Write-offs charged against the allowance(19)(35)(54)
Recoveries collected
Ending Balance at December 31, 2021$19 19 38 

BusinessConsumerTotal
(Dollars in millions)
Beginning balance at January 1, 2020(1)
$17 18 35 
Provision for expected losses30 36 66 
Write-offs charged against the allowance(22)(26)(48)
Recoveries collected
Ending Balance at December 31, 2020$29 32 61 

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(1)The beginning balance includes the cumulative effect of the adoption of the new credit loss standard.
(2)Due to an internal reorganization of our reporting categories on January 1, 2021, our accounts receivable portfolios were changed to align with changes to how we manage our customers. Allowance for credit losses previously included in the Consumer and Business portfolio of $32 million and $4 million, respectively, were reclassified to the Mass Markets allowance for credit losses on January 1, 2021, as a result of this change.