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Document and Entity Information (USD $)
In Billions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Feb. 17, 2015
Jun. 30, 2014
Document and Entity Information      
Entity Registrant Name CENTURYLINK, INC    
Entity Central Index Key 0000018926    
Document Type 10-K    
Document Period End Date Dec. 31, 2014    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 18.0dei_EntityPublicFloat
Entity Common Stock, Shares Outstanding (shares)   566,483,129dei_EntityCommonStockSharesOutstanding  
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY