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Revenue Recognition - Revenue by Segment, Sales Channel and Product Category (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]        
Total revenue $ 4,390 $ 4,887 $ 13,678 $ 14,840
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total revenue 4,390 4,887 13,678 14,840
Adjustments for non-ASC 606 revenue (331) (472) (1,099) (1,417)
Total revenue from contracts with customers 4,059 4,415 12,579 13,423
Operating Segments | Business        
Disaggregation of Revenue [Line Items]        
Total revenue 3,217 3,508 10,034 10,625
Adjustments for non-ASC 606 revenue (246) (273) (794) (820)
Total revenue from contracts with customers 2,971 3,235 9,240 9,805
Operating Segments | Business | Compute and Application Services        
Disaggregation of Revenue [Line Items]        
Total revenue 399 431 1,279 1,297
Adjustments for non-ASC 606 revenue (109) (133) (375) (400)
Total revenue from contracts with customers 290 298 904 897
Operating Segments | Business | IP and Data Services        
Disaggregation of Revenue [Line Items]        
Total revenue 1,417 1,543 4,434 4,670
Adjustments for non-ASC 606 revenue (1) (1) (3) (4)
Total revenue from contracts with customers 1,416 1,542 4,431 4,666
Operating Segments | Business | Fiber Infrastructure        
Disaggregation of Revenue [Line Items]        
Total revenue 530 578 1,629 1,687
Adjustments for non-ASC 606 revenue (74) (76) (227) (228)
Total revenue from contracts with customers 456 502 1,402 1,459
Operating Segments | Business | Voice and Other        
Disaggregation of Revenue [Line Items]        
Total revenue 871 956 2,692 2,971
Adjustments for non-ASC 606 revenue (62) (63) (189) (188)
Total revenue from contracts with customers 809 893 2,503 2,783
Operating Segments | Business | International and Global Accounts ("IGAM")        
Disaggregation of Revenue [Line Items]        
Total revenue 853 1,027 2,848 3,058
Adjustments for non-ASC 606 revenue (80) (104) (293) (305)
Total revenue from contracts with customers 773 923 2,555 2,753
Operating Segments | Business | International and Global Accounts ("IGAM") | Compute and Application Services        
Disaggregation of Revenue [Line Items]        
Total revenue 154 183 521 547
Adjustments for non-ASC 606 revenue (47) (71) (191) (210)
Total revenue from contracts with customers 107 112 330 337
Operating Segments | Business | International and Global Accounts ("IGAM") | IP and Data Services        
Disaggregation of Revenue [Line Items]        
Total revenue 350 431 1,190 1,287
Adjustments for non-ASC 606 revenue 0 0 0 0
Total revenue from contracts with customers 350 431 1,190 1,287
Operating Segments | Business | International and Global Accounts ("IGAM") | Fiber Infrastructure        
Disaggregation of Revenue [Line Items]        
Total revenue 199 231 642 665
Adjustments for non-ASC 606 revenue (33) (33) (102) (95)
Total revenue from contracts with customers 166 198 540 570
Operating Segments | Business | International and Global Accounts ("IGAM") | Voice and Other        
Disaggregation of Revenue [Line Items]        
Total revenue 150 182 495 559
Adjustments for non-ASC 606 revenue 0 0 0 0
Total revenue from contracts with customers 150 182 495 559
Operating Segments | Business | Large Enterprise        
Disaggregation of Revenue [Line Items]        
Total revenue 844 942 2,605 2,840
Adjustments for non-ASC 606 revenue (27) (26) (80) (83)
Total revenue from contracts with customers 817 916 2,525 2,757
Operating Segments | Business | Large Enterprise | Compute and Application Services        
Disaggregation of Revenue [Line Items]        
Total revenue 148 172 473 515
Adjustments for non-ASC 606 revenue (16) (15) (45) (45)
Total revenue from contracts with customers 132 157 428 470
Operating Segments | Business | Large Enterprise | IP and Data Services        
Disaggregation of Revenue [Line Items]        
Total revenue 378 394 1,151 1,192
Adjustments for non-ASC 606 revenue 0 0 0 0
Total revenue from contracts with customers 378 394 1,151 1,192
Operating Segments | Business | Large Enterprise | Fiber Infrastructure        
Disaggregation of Revenue [Line Items]        
Total revenue 117 143 359 403
Adjustments for non-ASC 606 revenue (11) (11) (35) (38)
Total revenue from contracts with customers 106 132 324 365
Operating Segments | Business | Large Enterprise | Voice and Other        
Disaggregation of Revenue [Line Items]        
Total revenue 201 233 622 730
Adjustments for non-ASC 606 revenue 0 0 0 0
Total revenue from contracts with customers 201 233 622 730
Operating Segments | Business | Mid-Market Enterprise        
Disaggregation of Revenue [Line Items]        
Total revenue 618 648 1,880 2,002
Adjustments for non-ASC 606 revenue (10) (11) (30) (35)
Total revenue from contracts with customers 608 637 1,850 1,967
Operating Segments | Business | Mid-Market Enterprise | Compute and Application Services        
Disaggregation of Revenue [Line Items]        
Total revenue 35 30 102 94
Adjustments for non-ASC 606 revenue (7) (8) (21) (25)
Total revenue from contracts with customers 28 22 81 69
Operating Segments | Business | Mid-Market Enterprise | IP and Data Services        
Disaggregation of Revenue [Line Items]        
Total revenue 406 421 1,229 1,291
Adjustments for non-ASC 606 revenue (1) (1) (3) (4)
Total revenue from contracts with customers 405 420 1,226 1,287
Operating Segments | Business | Mid-Market Enterprise | Fiber Infrastructure        
Disaggregation of Revenue [Line Items]        
Total revenue 49 50 148 156
Adjustments for non-ASC 606 revenue (2) (2) (6) (6)
Total revenue from contracts with customers 47 48 142 150
Operating Segments | Business | Mid-Market Enterprise | Voice and Other        
Disaggregation of Revenue [Line Items]        
Total revenue 128 147 401 461
Adjustments for non-ASC 606 revenue 0 0 0 0
Total revenue from contracts with customers 128 147 401 461
Operating Segments | Business | Wholesale        
Disaggregation of Revenue [Line Items]        
Total revenue 902 891 2,701 2,725
Adjustments for non-ASC 606 revenue (129) (132) (391) (397)
Total revenue from contracts with customers 773 759 2,310 2,328
Operating Segments | Business | Wholesale | Compute and Application Services        
Disaggregation of Revenue [Line Items]        
Total revenue 62 46 183 141
Adjustments for non-ASC 606 revenue (39) (39) (118) (120)
Total revenue from contracts with customers 23 7 65 21
Operating Segments | Business | Wholesale | IP and Data Services        
Disaggregation of Revenue [Line Items]        
Total revenue 283 297 864 900
Adjustments for non-ASC 606 revenue 0 0 0 0
Total revenue from contracts with customers 283 297 864 900
Operating Segments | Business | Wholesale | Fiber Infrastructure        
Disaggregation of Revenue [Line Items]        
Total revenue 165 154 480 463
Adjustments for non-ASC 606 revenue (28) (30) (84) (89)
Total revenue from contracts with customers 137 124 396 374
Operating Segments | Business | Wholesale | Voice and Other        
Disaggregation of Revenue [Line Items]        
Total revenue 392 394 1,174 1,221
Adjustments for non-ASC 606 revenue (62) (63) (189) (188)
Total revenue from contracts with customers 330 331 985 1,033
Operating Segments | Mass Markets        
Disaggregation of Revenue [Line Items]        
Total revenue 1,173 1,379 3,644 4,215
Adjustments for non-ASC 606 revenue (85) (199) (305) (597)
Total revenue from contracts with customers 1,088 1,180 3,339 3,618
Operating Segments | Mass Markets | Fiber Broadband        
Disaggregation of Revenue [Line Items]        
Total revenue 160 135 456 387
Adjustments for non-ASC 606 revenue (4) 0 (14) 0
Total revenue from contracts with customers 156 135 442 387
Operating Segments | Mass Markets | Other Broadband        
Disaggregation of Revenue [Line Items]        
Total revenue 580 619 1,786 1,899
Adjustments for non-ASC 606 revenue (55) (56) (166) (166)
Total revenue from contracts with customers 525 563 1,620 1,733
Operating Segments | Mass Markets | Voice and Other        
Disaggregation of Revenue [Line Items]        
Total revenue 433 625 1,402 1,929
Adjustments for non-ASC 606 revenue (26) (143) (125) (431)
Total revenue from contracts with customers $ 407 $ 482 $ 1,277 $ 1,498