v3.25.3
Revenue Recognition - Revenue from contracts with customers (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenue Recognition        
Revenue $ 257 $ 262 $ 784 $ 753
Lease, grant, and revenue from subsidies        
Revenue Recognition        
Revenue 24 18 71 57
Data | Consumer Revenue        
Revenue Recognition        
Revenue 59 62 180 186
Data | Business Revenue        
Revenue Recognition        
Revenue 124 122 375 333
Wireless | Consumer Revenue        
Revenue Recognition        
Revenue 35 35 104 105
Wireless | Business Revenue        
Revenue Recognition        
Revenue 8 10 24 31
Other | Consumer Revenue        
Revenue Recognition        
Revenue 4 12 22 32
Other | Business Revenue        
Revenue Recognition        
Revenue $ 3 $ 3 $ 8 $ 9