Represents the term of the collective bargaining agreements of the entity.

No definition available.

Name:	ctq_CollectiveBargainingAgreementsTerm
Namespace Prefix:	ctq_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of active employees and eligible retirees covered under a collective bargaining agreement.

+ References

No definition available.

+ Details

Name:	ctq_CollectiveBargainingArrangementNumberofParticipatingActiveEmployeesandRetirees
Namespace Prefix:	ctq_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of unionized employees covered by a collective bargaining arrangement.

+ References

No definition available.

+ Details

Name:	ctq_CollectiveBargainingArrangementNumberofUnionizedEmployees
Namespace Prefix:	ctq_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the percentage of share of pension and post-retirement benefit expenses allocated by our indirect parent and our ultimate parent under the respective benefit plans.

+ References

No definition available.

+ Details

Name:	ctq_DefinedPensionandPostRetirementBenefitPlansAllocatedExpensesbyParentEntitiesPercentage
Namespace Prefix:	ctq_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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=35743120&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

Name:	us-gaap_DefinedBenefitPlanFundedStatusOfPlan
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ 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 (j)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 2: 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=35743120&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ctq_CenturyLinkInc.andQwestCommunicationsInternationalInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Employee Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 31, 2013
CenturyLink, Inc. and Qwest Communications International Inc.
Employee Benefits
Allocated portion of QCII's total pension and CenturyLink's post-retirement benefit expenses (as a percent)	92.00%	91.00%	91.00%
Pension Plan \| QCII
Employee Benefits
Unfunded status		(159)
Pension (income) expense	(98)	(178)	(117)
Pension Plan \| CenturyLink, Inc.
Employee Benefits
Unfunded status	(2,402)
Post-Retirement Benefit Plan \| CenturyLink, Inc.
Employee Benefits
Unfunded status	(3,477)	(3,153)
Pension (income) expense	128	88	106
Employees covered under collective bargaining agreements
Employee Benefits
Collective bargaining agreements, term				4 years
Collective bargaining arrangement, number of participating unionized employees	11,000
Collective bargaining arrangement, number of participating active employees and retirees	11,000