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Accounts Receivable | 12 Months Ended
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Dec. 31, 2013
Receivables [Abstract] |
Accounts Receivable | Accounts Receivable The following table presents details of our accounts receivable balances:
| Successor
| December 31, 2013 |  | December 31, 2012
| (Dollars in millions)
Trade and purchased receivables | $ | 697 |  |  | 661 |
Earned and unbilled receivables | 73 |  |  | 82 |
Other | 11 |  |  | 12 |
Total accounts receivable | 781 |  |  | 755 |
Less: allowance for doubtful accounts | (43 | ) |  | (46 | )
Accounts receivable, less allowance | $ | 738 |  |  | 709 |
We are exposed to concentrations of credit risk from residential and business customers within our local service area and from other telecommunications service providers. No customers individually represented more than 10% of our accounts receivable for all periods presented herein. 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 doubtful accounts:
| Allowance for Doubtful Accounts
| (Dollars in millions)
Balance at December 31, 2010 (Predecessor) | $ | 48 |
Charged to expense-net | 17 |
Deductions | (18 | )
Balance at March 31, 2011(Predecessor) | $ | 47 |
Fair value adjustment | (47 | )
Balance at April 1, 2011 (Successor) | $ | — |
Charged to expense-net | 44 |
Deductions | (2 | )
Balance at December 31, 2011 (Successor) | $ | 42 |
Charged to expense-net | 74 |
Deductions | (70 | )
Balance at December 31, 2012 (Successor) | $ | 46 |
Charged to expense-net | 65 |
Deductions | (68 | )
Balance at December 31, 2013 (Successor) | $ | 43 |
As a result of CenturyLink's indirect acquisition of us, the allowance for doubtful accounts as of the April 1, 2011 acquisition date of $47 million was reduced to zero and our gross accounts receivable were reduced by $47 million to reflect its estimated acquisition date fair value.

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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/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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3, 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5066-111524 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Article 4 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5162-111524 + Details
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