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Employee Benefits (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 CenturyLink, Inc. and Qwest Communications International Inc. [Domain] | Dec. 31, 2013 CenturyLink, Inc. and Qwest Communications International Inc. [Domain] | Dec. 31, 2012 CenturyLink, Inc. and Qwest Communications International Inc. [Domain] | Dec. 31, 2011 Pension Plan QCII | Dec. 31, 2013 Pension Plan QCII | Dec. 31, 2012 Pension Plan QCII | Dec. 31, 2011 Post-Retirement Benefit Plan CenturyLink, Inc. | Dec. 31, 2013 Post-Retirement Benefit Plan CenturyLink, Inc. | Dec. 31, 2012 Post-Retirement Benefit Plan CenturyLink, Inc. | Mar. 31, 2011 Predecessor QCII | Mar. 31, 2011 Predecessor Pension Plan QCII | Mar. 31, 2011 Predecessor Post-Retirement Benefit Plan QCII | Dec. 31, 2013 Employees covered under collective bargaining agreements Employee
Employee Benefits |  |  |  |  |  |  |  |  |  |  |  |  |
Unfunded status |  |  |  |  | $ (159) | $ 948 |  | $ 3,153 | $ (3,448) |  |  |  |
Pension (income) expense |  |  |  | (51) | (178) | (117) |  |  |  |  | 11 |  |
Other postretirement benefit expense |  |  |  |  |  |  | $ 84 | $ 88 | $ 106 |  |  | $ 16 |
Percentage of allocated portion of QCII's total pension and post-retirement benefit expenses (as a percent) | 96.00% | 91.00% | 91.00% |  |  |  |  |  |  | 102.00% |  |  |
Collective bargaining agreements, term |  |  |  |  |  |  |  |  |  |  |  |  | 4 years
Collective Bargaining Arrangement, Number of Participating Employees |  |  |  |  |  |  |  |  |  |  |  |  | 12,000

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- Definition Represents the percentage of share of pension and post-retirement benefit expenses allocated by the parent under benefit plan. + References No definition available. + Details
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- Definition The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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- Definition The amount of costs recognized during the period for non-pension postretirement benefits, such as medical, dental and life insurance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (q) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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