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Accounts Receivable (Details) (USD $) | 9 Months Ended | 12 Months Ended |  | 0 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 02, 2011 | Apr. 02, 2012 Predecessor | Mar. 31, 2011 Predecessor | Apr. 02, 2011 Acquisition of QCII, amounts attributable to Qwest CenturyLink, Inc. | Mar. 31, 2011 Acquisition of QCII, amounts attributable to Qwest CenturyLink, Inc.
Accounts receivable |  |  |  |  |  |  |  |
Trade and purchased receivables |  | $ 697,000,000 | $ 661,000,000 |  |  |  |  |
Earned and unbilled receivables |  | 73,000,000 | 82,000,000 |  |  |  |  |
Other Receivables, Gross, Current |  | 11,000,000 | 12,000,000 |  |  |  |  |
Total accounts receivable |  | 781,000,000 | 755,000,000 |  |  |  |  |
Accounts receivable, allowance (in dollars) | (42,000,000) | (43,000,000) | (46,000,000) |  |  |  |  |
Accounts receivable, less allowance |  | 738,000,000 | 709,000,000 |  |  |  |  |
Changes in allowance for doubtful accounts |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | 0 |  | 48,000,000 | 0 | 47,000,000
Charged to expense-net | 44,000,000 | 65,000,000 | 74,000,000 |  |  | 17,000,000 |  |
Deductions | (2,000,000) | (68,000,000) | (70,000,000) |  |  | (18,000,000) |  |
Fair value adjustment |  |  |  |  | (47,000,000) |  |  |
Balance at the end of the period |  | $ 43,000,000 |  | $ 0 |  | $ 47,000,000 | $ 0 | $ 47,000,000

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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + 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) -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 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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