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Credit Losses on Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2023
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 from December 31, 2021 through December 31, 2023:
| Business |  | Mass Markets |  | Total |  |  |  |
| (Dollars in millions) |  |  |  |
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 |  |  |  |  |
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 |  |  |  |  |
Balance at December 31, 2022 | $ | 20 |  |  | 16 |  |  | 36 |  |  |  |  |
Provision for expected losses | 20 |  |  | 46 |  |  | 66 |  |  |  |  |
Write-offs charged against the allowance | (26) |  |  | (43) |  |  | (69) |  |  |  |  |
Recoveries collected | — |  |  | 1 |  |  | 1 |  |  |  |  |
Balance at December 31, 2023 | $ | 14 |  |  | 20 |  |  | 34 |  |  |  |  |
(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://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B + Details
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