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Labor Union Contracts (Details)
Dec. 31, 2014
Employees covered under collective bargaining agreements  
Labor Union Contracts  
Percentage of employees who are members of bargaining units (percent) 36.00%ctl_PercentageOfEmployeesWhoAreMembersOfVariousBargainingUnits
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsMember
Employees covered under expired collective bargaining agreements  
Labor Union Contracts  
Percentage of employees who are members of bargaining units (percent) 4.00%ctl_PercentageOfEmployeesWhoAreMembersOfVariousBargainingUnits
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= ctl_WorkforceSubjecttoCollectiveBargainingArrangementsExpiredWithinOneYearMember
Number of employees covered under the agreement (employees) 2,000ctl_CollectiveBargainingArrangementNumberofParticipatingEmployees
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= ctl_WorkforceSubjecttoCollectiveBargainingArrangementsExpiredWithinOneYearMember
Employees subject to collective bargaining arrangements expiring within one year  
Labor Union Contracts  
Percentage of employees who are members of bargaining units (percent) 4.00%ctl_PercentageOfEmployeesWhoAreMembersOfVariousBargainingUnits
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinOneYearMember
Number of employees covered under the agreement (employees) 2,000ctl_CollectiveBargainingArrangementNumberofParticipatingEmployees
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinOneYearMember