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Credit Losses on Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2024
Credit Loss [Abstract] |
Schedule of 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 | $ | 36 |  |  | 31 |  |  | 67 |
Provision for expected losses | 19 |  |  | 35 |  |  | 54 |
Write-offs charged against the allowance | (26) |  |  | (43) |  |  | (69) |
Recoveries collected | 5 |  |  | 3 |  |  | 8 |
Ending balance at September 30, 2024 | $ | 34 |  |  | 26 |  |  | 60 |

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