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Credit Losses on Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2024
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 nine months ended September 30, 2024:
| Business |  | Mass Markets |  | Total
| (Dollars in millions)
As of December 31, 2023 | $ | 14 |  |  | 20 |  |  | 34 |
Provision for expected losses | 8 |  |  | 27 |  |  | 35 |
Write-offs charged against the allowance | (8) |  |  | (32) |  |  | (40) |
Recoveries collected | — |  |  | 2 |  |  | 2 |
Ending balance at September 30, 2024 | $ | 14 |  |  | 17 |  |  | 31 |

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