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Credit Losses on Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2023
Credit Loss [Abstract] |
Schedule of Allowance for Credit Loss | The following table presents the activity of our allowance for credit losses by accounts receivable portfolio for the six months ended June 30, 2023:
| Business |  | Mass Markets |  | Total
| (Dollars in millions)
As of December 31, 2022 | $ | 20 |  |  | 16 |  |  | 36 |
Provision for expected losses | 9 |  |  | 19 |  |  | 28 |
Write-offs charged against the allowance | (8) |  |  | (21) |  |  | (29) |
Ending balance at June 30, 2023 | $ | 21 |  |  | 14 |  |  | 35 |

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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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