v3.26.1
Segment Information - Schedule of Segment Results (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
Depreciation and amortization 668 688 1,332 1,401
Goodwill impairment 0 628 0 628
Total operating expenses 2,893 3,695 5,190 6,770
OPERATING (LOSS) INCOME (88) (603) 514 (496)
Total other expense, net (167) (546) (592) (898)
LOSS BEFORE INCOME TAXES (255) (1,149) (78) (1,394)
Income tax (benefit) expense (54) (234) 323 (278)
NET LOSS (201) (915) (401) (1,116)
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
Stock-based compensation 18 12 31 22
Depreciation and amortization 668 688 1,332 1,401
Goodwill impairment 0 628 0 628
Total operating expenses 2,893 3,695 5,190 6,770
OPERATING (LOSS) INCOME (88) (603) 514 (496)
Total other expense, net (167) (546) (592) (898)
LOSS BEFORE INCOME TAXES (255) (1,149) (78) (1,394)
Income tax (benefit) expense (54) (234) 323 (278)
NET LOSS (201) (915) (401) (1,116)
Adjusted EBITDA $ 598 $ 725 $ 1,877 $ 1,555