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Segment Information Revenue By Service Offering (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenue from External Customer                      
Revenue $ 1,914us-gaap_Revenues $ 1,629us-gaap_Revenues $ 1,625us-gaap_Revenues $ 1,609us-gaap_Revenues $ 1,602us-gaap_Revenues $ 1,569us-gaap_Revenues $ 1,565us-gaap_Revenues $ 1,577us-gaap_Revenues $ 6,777us-gaap_Revenues $ 6,313us-gaap_Revenues $ 6,376us-gaap_Revenues
Core Network Service                      
Revenue from External Customer                      
Revenue                 6,195us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= lvlt_CoreNetworkServiceMember		 5,591us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= lvlt_CoreNetworkServiceMember		 5,463us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= lvlt_CoreNetworkServiceMember
Wholesale Voice Services and Other                      
Revenue from External Customer                      
Revenue                 $ 582us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= lvlt_WholesaleVoiceServicesAndOtherMember		 $ 722us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= lvlt_WholesaleVoiceServicesAndOtherMember		 $ 913us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= lvlt_WholesaleVoiceServicesAndOtherMember