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Other Financial Information Other Financial Information (Details) (Wireless spectrum licenses, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Nov. 03, 2014
Wireless spectrum licenses
   
Schedule of Impaired Long-Lived Assets Held for Sale [Line Items]    
Impairment of intangible assets, indefinite-lived (excluding goodwill) $ (14)us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ ctl_ImpairedLongLivedAssetsHeldforsalebyTypeAxis
= ctl_WirelessSpectrumLicensesMember
 
Disposed long-lived assets, contract sales price   $ 39ctl_DisposedLongLivedAssetsContractSalesPrice
/ ctl_ImpairedLongLivedAssetsHeldforsalebyTypeAxis
= ctl_WirelessSpectrumLicensesMember