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Accounts Receivable | 12 Months Ended
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Dec. 31, 2022
Receivables [Abstract] |
Accounts Receivable | Accounts Receivable The following table presents details of our accounts receivable balances:
| As of December 31,
| 2022 |  | 2021
| (Dollars in millions)
Trade and purchased receivables | $ | 282 |  |  | 268 |
Earned and unbilled receivables | 23 |  |  | 35 |
Other | 40 |  |  | 36 |
Total accounts receivable | 345 |  |  | 339 |
Less: allowance for credit losses | (36) |  |  | (38) |
Accounts receivable, less allowance | $ | 309 |  |  | 301 |
We are exposed to concentrations of credit risk from our customers. We generally do not require collateral to secure our receivable balances. We have agreements with other telecommunications service providers whereby we agree to bill and collect on their behalf for services rendered by those providers to our customers within our local service area. We purchase accounts receivable from other telecommunications service providers primarily on a recourse basis and include these amounts in our accounts receivable balance. We have not experienced any significant loss associated with these purchased receivables. The following table presents details of our allowance for credit losses:
| Beginning Balance |  | Additions |  | Deductions |  | Ending Balance
| (Dollars in millions)
2022 | $ | 38 |  |  | 60 |  |  | (62) |  |  | 36 |
2021 | 61 |  |  | 27 |  |  | (50) |  |  | 38 |
2020(1) | 39 |  |  | 66 |  |  | (44) |  |  | 61 |
_______________________________________________________________________________ (1)On January 1, 2020, we adopted ASU 2016-13 "Measurement of Credit Losses on Financial Instruments" and recognized a cumulative adjustment to our accumulated deficit as of the date of adoption of $3 million, net of $1 million tax effect. This adjustment is included within "Deductions". Please refer to Note 5—Credit Losses on Financial Instruments for more information.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI https://asc.fasb.org/subtopic&trid=2196772 + Details
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