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Accounts Receivable (Tables) | 12 Months Ended
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Dec. 31, 2022
Receivables [Abstract] |
Schedule of the entity's accounts receivable balances | 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 |
Schedule of the entity's allowance for doubtful accounts | 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 Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of allowance for credit loss of financing receivable, classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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