| Telephone
                                                                                                            Service
                                                                                                            Market | 
                                                                                                        
                                                                                                          | Residential | 
                                                                                                        
                                                                                                          | Residential
                                                                                                            Telephone
                                                                                                            Lines | 
                                                                                                        
                                                                                                          | Residential
                                                                                                            Lines
                                                                                                            Per
                                                                                                            Household | 
                                                                                                        
                                                                                                          | Digital
                                                                                                            Access
                                                                                                            Lines | 
                                                                                                        
                                                                                                          | Revenues
                                                                                                            from
                                                                                                            Residential
                                                                                                            Customers | 
                                                                                                        
                                                                                                          | Voice | 
                                                                                                        
                                                                                                          | Data | 
                                                                                                        
                                                                                                          | Revenues
                                                                                                            By
                                                                                                            State | 
                                                                                                        
                                                                                                          | Local
                                                                                                            Call
                                                                                                            Revenues | 
                                                                                                        
                                                                                                          | Toll
                                                                                                            Call
                                                                                                            Revenues | 
                                                                                                        
                                                                                                          |  | 
                                                                                                        
                                                                                                          | Business | 
                                                                                                        
                                                                                                          | Business
                                                                                                            Telephone
                                                                                                            Lines | 
                                                                                                        
                                                                                                          | Lines
                                                                                                            Per
                                                                                                            Employee | 
                                                                                                        
                                                                                                          | Revenues
                                                                                                            from
                                                                                                            Business
                                                                                                            Customers | 
                                                                                                        
                                                                                                          | Voice | 
                                                                                                        
                                                                                                          | Data | 
                                                                                                        
                                                                                                          | Revenues
                                                                                                            By
                                                                                                            State | 
                                                                                                        
                                                                                                          | Digital
                                                                                                            Access
                                                                                                            Lines | 
                                                                                                        
                                                                                                          | Local
                                                                                                            Call
                                                                                                            Revenues | 
                                                                                                        
                                                                                                          |  | 
                                                                                                        
                                                                                                          | Toll
                                                                                                            Call
                                                                                                            Revenues | 
                                                                                                        
                                                                                                          | Domestic | 
                                                                                                        
                                                                                                          | International | 
                                                                                                        
                                                                                                          | Domestic
                                                                                                            Long
                                                                                                            Distance
                                                                                                            Rates | 
                                                                                                        
                                                                                                          | International
                                                                                                            Long
                                                                                                            Distance
                                                                                                            Rates | 
                                                                                                        
                                                                                                          | Number
                                                                                                            of
                                                                                                            Domestic
                                                                                                            Calls | 
                                                                                                        
                                                                                                          | Number
                                                                                                            of
                                                                                                            International
                                                                                                            Calls | 
                                                                                                        
                                                                                                          | Access
                                                                                                            Charges | 
                                                                                                        
                                                                                                          | Internet
                                                                                                            Telephony |