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Credit Losses on Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2024
Credit Loss [Abstract] |
Activity on allowance for credit losses | The following table presents the activity of our allowance for credit losses by accounts receivable portfolio:
| Business |  | Mass Markets |  | Total |  |  |  |
| (Dollars in millions) |  |  |  |
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 |  |  |  |  |
Provision for expected losses | 9 |  |  | 36 |  |  | 45 |  |  |  |  |
Write-offs charged against the allowance | (10) |  |  | (42) |  |  | (52) |  |  |  |  |
Recoveries collected | — |  |  | 2 |  |  | 2 |  |  |  |  |
Balance at December 31, 2024 | $ | 13 |  |  | 16 |  |  | 29 |  |  |  |  |

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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/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 2: 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 + Details
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