v3.26.3
Segment Information - Schedule of Segment Results (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenues $ 2,715 $ 3,087 $ 8,419 $ 9,361
Operating expenses        
Cost of services and products related to network expenses 1,432 1,700 4,282 5,011
Net gain on sale of business (4) 0 (569) 0
Depreciation and amortization 670 674 2,002 2,075
Goodwill impairment 0 0 0 628
Total operating expenses 2,882 3,203 8,072 9,973
OPERATING (LOSS) INCOME (167) (116) 347 (612)
Total other expense, net (168) (697) (760) (1,595)
LOSS BEFORE INCOME TAXES (335) (813) (413) (2,207)
Income tax (benefit) expense (70) (192) 253 (470)
NET LOSS (265) (621) (666) (1,737)
Reportable Segment        
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]        
Revenues 2,715 3,087 8,419 9,361
Operating expenses        
Cost of services and products related to network expenses 800 929 2,450 2,846
Headcount costs 617 685 1,851 1,953
Non-headcount costs 781 902 2,289 2,436
Net gain on sale of business (4) 0 (569) 0
Stock-based compensation 18 13 49 35
Depreciation and amortization 670 674 2,002 2,075
Goodwill impairment 0 0 0 628
Total operating expenses 2,882 3,203 8,072 9,973
OPERATING (LOSS) INCOME (167) (116) 347 (612)
Total other expense, net (168) (697) (760) (1,595)
LOSS BEFORE INCOME TAXES (335) (813) (413) (2,207)
Income tax (benefit) expense (70) (192) 253 (470)
NET LOSS (265) (621) (666) (1,737)
Adjusted EBITDA $ 521 $ 571 $ 2,398 $ 2,126