v3.25.4
Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Summary of Significant Accounting Policies    
Property and equipment, gross $ 2,083 $ 1,829
Accumulated depreciation (826) (679)
Property and equipment, net 1,257 1,150
Depreciation expense 153 147
Capitalized interest costs 10 10
Land    
Summary of Significant Accounting Policies    
Property and equipment, gross 12 13
Buildings    
Summary of Significant Accounting Policies    
Property and equipment, gross $ 118 $ 114
Useful lives of property and equipment 25 years 25 years
Telephony transmission equipment and distribution facilities    
Summary of Significant Accounting Policies    
Property and equipment, gross $ 1,023 $ 899
Telephony transmission equipment and distribution facilities | Minimum    
Summary of Significant Accounting Policies    
Useful lives of property and equipment 5 years 5 years
Telephony transmission equipment and distribution facilities | Maximum    
Summary of Significant Accounting Policies    
Useful lives of property and equipment 20 years 20 years
Cable transmission equipment and distribution facilities    
Summary of Significant Accounting Policies    
Property and equipment, gross $ 195 $ 156
Cable transmission equipment and distribution facilities | Minimum    
Summary of Significant Accounting Policies    
Useful lives of property and equipment 5 years 5 years
Cable transmission equipment and distribution facilities | Maximum    
Summary of Significant Accounting Policies    
Useful lives of property and equipment 30 years 30 years
Support equipment and systems    
Summary of Significant Accounting Policies    
Property and equipment, gross $ 145 $ 128
Support equipment and systems | Minimum    
Summary of Significant Accounting Policies    
Useful lives of property and equipment 3 years 3 years
Support equipment and systems | Maximum    
Summary of Significant Accounting Policies    
Useful lives of property and equipment 20 years 20 years
Fiber optic cable systems    
Summary of Significant Accounting Policies    
Property and equipment, gross $ 173 $ 130
Fiber optic cable systems | Minimum    
Summary of Significant Accounting Policies    
Useful lives of property and equipment 15 years 15 years
Fiber optic cable systems | Maximum    
Summary of Significant Accounting Policies    
Useful lives of property and equipment 25 years 25 years
Other    
Summary of Significant Accounting Policies    
Property and equipment, gross $ 111 $ 87
Other | Minimum    
Summary of Significant Accounting Policies    
Useful lives of property and equipment 2 years 2 years
Other | Maximum    
Summary of Significant Accounting Policies    
Useful lives of property and equipment 20 years 20 years
Construction in progress    
Summary of Significant Accounting Policies    
Property and equipment, gross $ 306 $ 302