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Accounts Receivable (Tables) | 12 Months Ended
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Dec. 31, 2015
Receivables [Abstract] |
Schedule of the entity's accounts receivable balances | The following table presents details of our accounts receivable balances:
| As of December 31,
| 2015 |  | 2014
| (Dollars in millions)
Trade and purchased receivables | $ | 620 |  |  | 649 |
Earned and unbilled receivables | 111 |  |  | 120 |
Other | 4 |  |  | 9 |
Total accounts receivable | 735 |  |  | 778 |
Less: allowance for doubtful accounts | (47 | ) |  | (38 | )
Accounts receivable, less allowance | $ | 688 |  |  | 740 |
Schedule of the entity's allowance for doubtful accounts | The following table presents details of our allowance for doubtful accounts:
| Beginning Balance |  | Additions |  | Deductions |  | Ending Balance
| (Dollars in millions)
2015 | $ | 38 |  |  | 78 |  |  | (69 | ) |  | 47 |
2014 | $ | 43 |  |  | 64 |  |  | (69 | ) |  | 38 |
2013 | $ | 46 |  |  | 65 |  |  | (68 | ) |  | 43 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of credit losses for current financing receivables (such as trade and accounts receivable), including a rollforward of the balance. An alternative caption includes allowance for doubtful accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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