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Basis of Presentation Basis of Presentation (Details 2)
$ in Millions
3 Months Ended 9 Months Ended
Aug. 27, 2015
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
state
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
state
Sep. 30, 2014
USD ($)
Products and Services Revenues            
Number of states in which entity operates (states) | state     14   14  
Revenues     $ 2,287 $ 2,198 $ 6,726 $ 6,615
CAF Phase 2 Support            
Products and Services Revenues            
Federal support, total amount per agreement $ 150          
Number of rural households and businesses 300,000          
Number of states in which entity operates (states) 13          
Revenues     $ 64      
CAF Phase 2 Support | Scenario, Forecast            
Products and Services Revenues            
Revenues   $ 23        
CAF Phase 2 Support | CenturyLink, Inc.            
Products and Services Revenues            
Federal support, total amount per agreement $ 500          
Contract or agreement term (in years) 6          
Number of rural households and businesses 1,200,000          
Number of states in which entity operates (states) 33