v3.26.1
Segment Information - Revenue to EBITDA (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenues $ 2,805 $ 3,092 $ 5,704 $ 6,274
Operating expenses        
Cost of services and products related to network expenses 1,415 1,624 2,850 3,311
Net loss (gain) on sale of business 31 0 (565) 0
Reportable Segment        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenues 2,805 3,092 5,704 6,274
Operating expenses        
Cost of services and products related to network expenses 813 899 1,650 1,917
Headcount costs 591 649 1,234 1,268
Non-headcount costs 772 819 1,508 1,534
Net loss (gain) on sale of business 31 0 (565) 0
Adjusted EBITDA $ 598 $ 725 $ 1,877 $ 1,555