v3.26.3
Revenue Recognition - Schedule of Revenue by Segment, Sales Channel and Product Category (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Disaggregation of Revenue [Line Items]        
Total Revenue $ 2,715 $ 3,087 $ 8,419 $ 9,361
Adjustments for Non-ASC 606 Revenue (333) (281) (924) (775)
Total Revenue from Contracts with Customers 2,382 2,806 7,495 8,586
Operating Segments | Business        
Disaggregation of Revenue [Line Items]        
Total Revenue 2,346 2,456 7,234 7,470
Adjustments for Non-ASC 606 Revenue (291) (248) (845) (719)
Total Revenue from Contracts with Customers 2,055 2,208 6,389 6,751
Operating Segments | Business | Large Enterprise        
Disaggregation of Revenue [Line Items]        
Total Revenue 810 782 2,382 2,317
Adjustments for Non-ASC 606 Revenue (149) (101) (416) (279)
Total Revenue from Contracts with Customers 661 681 1,966 2,038
Operating Segments | Business | Mid-Market Enterprise        
Disaggregation of Revenue [Line Items]        
Total Revenue 430 464 1,304 1,424
Adjustments for Non-ASC 606 Revenue (7) (8) (21) (22)
Total Revenue from Contracts with Customers 423 456 1,283 1,402
Operating Segments | Business | Public Sector        
Disaggregation of Revenue [Line Items]        
Total Revenue 429 476 1,425 1,440
Adjustments for Non-ASC 606 Revenue (30) (25) (85) (73)
Total Revenue from Contracts with Customers 399 451 1,340 1,367
Operating Segments | Business | Wholesale        
Disaggregation of Revenue [Line Items]        
Total Revenue 607 655 1,908 2,046
Adjustments for Non-ASC 606 Revenue (105) (113) (322) (342)
Total Revenue from Contracts with Customers 502 542 1,586 1,704
Operating Segments | Business | International and Other        
Disaggregation of Revenue [Line Items]        
Total Revenue 70 79 215 243
Adjustments for Non-ASC 606 Revenue 0 (1) (1) (3)
Total Revenue from Contracts with Customers 70 78 214 240
Operating Segments | Business | Strategic        
Disaggregation of Revenue [Line Items]        
Total Revenue 1,279 1,167 3,814 3,436
Adjustments for Non-ASC 606 Revenue (255) (207) (730) (590)
Total Revenue from Contracts with Customers 1,024 960 3,084 2,846
Operating Segments | Business | Strategic | Large Enterprise        
Disaggregation of Revenue [Line Items]        
Total Revenue 584 507 1,675 1,448
Adjustments for Non-ASC 606 Revenue (149) (101) (416) (279)
Total Revenue from Contracts with Customers 435 406 1,259 1,169
Operating Segments | Business | Strategic | Mid-Market Enterprise        
Disaggregation of Revenue [Line Items]        
Total Revenue 250 236 734 704
Adjustments for Non-ASC 606 Revenue (6) (7) (18) (18)
Total Revenue from Contracts with Customers 244 229 716 686
Operating Segments | Business | Strategic | Public Sector        
Disaggregation of Revenue [Line Items]        
Total Revenue 150 135 525 404
Adjustments for Non-ASC 606 Revenue (30) (25) (84) (73)
Total Revenue from Contracts with Customers 120 110 441 331
Operating Segments | Business | Strategic | Wholesale        
Disaggregation of Revenue [Line Items]        
Total Revenue 258 255 774 779
Adjustments for Non-ASC 606 Revenue (70) (73) (211) (217)
Total Revenue from Contracts with Customers 188 182 563 562
Operating Segments | Business | Strategic | International and Other        
Disaggregation of Revenue [Line Items]        
Total Revenue 37 34 106 101
Adjustments for Non-ASC 606 Revenue 0 (1) (1) (3)
Total Revenue from Contracts with Customers 37 33 105 98
Operating Segments | Business | Legacy        
Disaggregation of Revenue [Line Items]        
Total Revenue 1,067 1,289 3,420 4,034
Adjustments for Non-ASC 606 Revenue (36) (41) (115) (129)
Total Revenue from Contracts with Customers 1,031 1,248 3,305 3,905
Operating Segments | Business | Legacy | Large Enterprise        
Disaggregation of Revenue [Line Items]        
Total Revenue 226 275 707 869
Adjustments for Non-ASC 606 Revenue 0 0 0 0
Total Revenue from Contracts with Customers 226 275 707 869
Operating Segments | Business | Legacy | Mid-Market Enterprise        
Disaggregation of Revenue [Line Items]        
Total Revenue 180 228 570 720
Adjustments for Non-ASC 606 Revenue (1) (1) (3) (4)
Total Revenue from Contracts with Customers 179 227 567 716
Operating Segments | Business | Legacy | Public Sector        
Disaggregation of Revenue [Line Items]        
Total Revenue 279 341 900 1,036
Adjustments for Non-ASC 606 Revenue 0 0 (1) 0
Total Revenue from Contracts with Customers 279 341 899 1,036
Operating Segments | Business | Legacy | Wholesale        
Disaggregation of Revenue [Line Items]        
Total Revenue 349 400 1,134 1,267
Adjustments for Non-ASC 606 Revenue (35) (40) (111) (125)
Total Revenue from Contracts with Customers 314 360 1,023 1,142
Operating Segments | Business | Legacy | International and Other        
Disaggregation of Revenue [Line Items]        
Total Revenue 33 45 109 142
Adjustments for Non-ASC 606 Revenue 0 0 0 0
Total Revenue from Contracts with Customers 33 45 109 142
Operating Segments | Mass Market        
Disaggregation of Revenue [Line Items]        
Total Revenue 369 631 1,185 1,891
Adjustments for Non-ASC 606 Revenue (42) (33) (79) (56)
Total Revenue from Contracts with Customers 327 598 1,106 1,835
Operating Segments | Mass Market | Fiber Broadband        
Disaggregation of Revenue [Line Items]        
Total Revenue 17 225 126 651
Adjustments for Non-ASC 606 Revenue 0 (3) (2) (9)
Total Revenue from Contracts with Customers 17 222 124 642
Operating Segments | Mass Market | Other Broadband        
Disaggregation of Revenue [Line Items]        
Total Revenue 179 230 576 732
Adjustments for Non-ASC 606 Revenue (14) (23) (47) (71)
Total Revenue from Contracts with Customers 165 207 529 661
Operating Segments | Mass Market | Voice and Other        
Disaggregation of Revenue [Line Items]        
Total Revenue 173 176 483 508
Adjustments for Non-ASC 606 Revenue (28) (7) (30) 24
Total Revenue from Contracts with Customers $ 145 $ 169 $ 453 $ 532