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Credit Losses on Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2021
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:
| Business |  | Mass Markets |  | Total |  |  |  |
| (Dollars in millions) |  |  |  |
Beginning balance at January 1, 2021(1) | $ | 109 |  |  | 82 |  |  | 191 |  |  |  |  |
Provision for expected losses | 13 |  |  | 14 |  |  | 27 |  |  |  |  |
Write-offs charged against the allowance | (19) |  |  | (48) |  |  | (67) |  |  |  |  |
Recoveries collected | 5 |  |  | 6 |  |  | 11 |  |  |  |  |
Ending balance at March 31, 2021 | $ | 108 |  |  | 54 |  |  | 162 |  |  |  |  |
______________________________________________________________________ (1)As described in Note 11—Segment Information, we completed an internal reorganization in January 2021. As a result of this change, allowance for credit losses previously included in the Consumer and Business portfolio of $70 million related to consumer and $12 million related to our small business group, respectively, were reclassified to the Mass Markets allowance for credit losses on January 1, 2021.

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