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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 | $ | 1,288 |  |  | 1,281 |
Earned and unbilled receivables | 209 |  |  | 315 |
Other | 65 |  |  | 62 |
Total accounts receivable | 1,562 |  |  | 1,658 |
Less: allowance for credit losses | (85) |  |  | (114) |
Accounts receivable, less allowance | $ | 1,477 |  |  | 1,544 |
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 communications 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 communications 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 accounts:
| Beginning Balance |  | Additions |  | Deductions |  | Ending Balance
| (Dollars in millions)
2022 | $ | 114 |  |  | 133 |  |  | (162) |  |  | 85 |
2021 | 191 |  |  | 105 |  |  | (182) |  |  | 114 |
2020(1) | 106 |  |  | 189 |  |  | (104) |  |  | 191 |
_______________________________________________________________________________ (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 $9 million, net of a $2 million tax effect. This adjustment is included within "Deductions." See Note 6—Credit Losses on Financial Instruments for more information.

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- Definition The entire disclosure for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI https://asc.fasb.org/subtopic&trid=2196772 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -URI https://asc.fasb.org/subtopic&trid=2196816 + Details
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