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Credit Losses on Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2022
Credit Loss [Abstract] |
Financing Receivable, Allowance for Credit Loss | The following table presents the activity of our allowance for credit losses by accounts receivable portfolio for the years ended December 31, 2022 and December 31, 2021:
| Business |  | Mass Markets |  | Total |  |  |  |
| (Dollars in millions) |  |  |  |
Beginning balance at January 1, 2021(1) | $ | 25 |  |  | 36 |  |  | 61 |  |  |  |  |
Provision for expected losses | 10 |  |  | 17 |  |  | 27 |  |  |  |  |
Write-offs charged against the allowance | (19) |  |  | (35) |  |  | (54) |  |  |  |  |
Recoveries collected | 3 |  |  | 1 |  |  | 4 |  |  |  |  |
Beginning balance at December 31, 2021 | $ | 19 |  |  | 19 |  |  | 38 |  |  |  |  |
Provision for expected losses | 13 |  |  | 47 |  |  | 60 |  |  |  |  |
Write-offs charged against the allowance | (14) |  |  | (50) |  |  | (64) |  |  |  |  |
Recoveries collected | 2 |  |  | — |  |  | 2 |  |  |  |  |
Ending Balance at December 31, 2022 | $ | 20 |  |  | 16 |  |  | 36 |  |  |  |  |
______________________________________________________________________ (1)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.

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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