Annual report [Section 13 and 15(d), not S-K Item 405]

Summary of Significant Accounting Policies - Property and Equipment (Details)

v3.25.0.1
Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]      
Property and equipment $ 1,829 $ 1,583  
Accumulated depreciation (679) (530)  
Property and equipment, net 1,150 1,053  
Depreciation expense 147 166 $ 195
Capitalized interest costs 10 7 $ 4
Land      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 13 16  
Building      
Property, Plant and Equipment [Line Items]      
Remaining useful lives of property and equipment 25 years    
Property and equipment, gross $ 114 108  
Telephony transmission equipment and distribution facilities      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 899 832  
Telephony transmission equipment and distribution facilities | Minimum      
Property, Plant and Equipment [Line Items]      
Remaining useful lives of property and equipment 5 years    
Telephony transmission equipment and distribution facilities | Maximum      
Property, Plant and Equipment [Line Items]      
Remaining useful lives of property and equipment 20 years    
Cable transmission equipment and distribution facilities      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 156 118  
Cable transmission equipment and distribution facilities | Minimum      
Property, Plant and Equipment [Line Items]      
Remaining useful lives of property and equipment 5 years    
Cable transmission equipment and distribution facilities | Maximum      
Property, Plant and Equipment [Line Items]      
Remaining useful lives of property and equipment 30 years    
Support equipment and systems      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 128 112  
Support equipment and systems | Minimum      
Property, Plant and Equipment [Line Items]      
Remaining useful lives of property and equipment 3 years    
Support equipment and systems | Maximum      
Property, Plant and Equipment [Line Items]      
Remaining useful lives of property and equipment 20 years    
Fiber optic cable systems      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 130 128  
Fiber optic cable systems | Minimum      
Property, Plant and Equipment [Line Items]      
Remaining useful lives of property and equipment 15 years    
Fiber optic cable systems | Maximum      
Property, Plant and Equipment [Line Items]      
Remaining useful lives of property and equipment 25 years    
Other      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 87 72  
Other | Minimum      
Property, Plant and Equipment [Line Items]      
Remaining useful lives of property and equipment 2 years    
Other | Maximum      
Property, Plant and Equipment [Line Items]      
Remaining useful lives of property and equipment 20 years    
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 302 $ 197