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Segment Information - Segment Results and Operating Revenue (Details ) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating revenues by products and services      
Revenues $ 20,712 $ 21,458 $ 22,580
Cost of services and products 8,934 9,134 9,999
Selling, general and administrative 3,464 3,715 4,165
Less: share-based compensation (175) (162) (186)
Total expense 12,223 12,687 13,978
Total segment adjusted EBITDA 8,489 8,771 8,602
IP and Data Services      
Operating revenues by products and services      
Revenues 6,372 6,621 6,614
Transport and Infrastructure      
Operating revenues by products and services      
Revenues 4,989 5,019 5,256
Voice and Collaboration      
Operating revenues by products and services      
Revenues 3,621 3,766 4,091
IT and Managed Services      
Operating revenues by products and services      
Revenues 479 535 625
Broadband      
Operating revenues by products and services      
Revenues 2,909 2,876 2,824
Voice      
Operating revenues by products and services      
Revenues 1,622 1,837 2,127
Regulatory      
Operating revenues by products and services      
Revenues 615 632 727
Other      
Operating revenues by products and services      
Revenues 105 172 316
Operating Segments      
Operating revenues by products and services      
Revenues 20,712 21,458 22,580
Cost of services and products 3,857 3,819 4,123
Selling, general and administrative 1,691 1,844 1,985
Less: share-based compensation 0 0 0
Total expense 5,548 5,663 6,108
Total segment adjusted EBITDA 15,164 15,795 16,472
Operating Segments | IP and Data Services      
Operating revenues by products and services      
Revenues 6,372 6,621 6,614
Operating Segments | Transport and Infrastructure      
Operating revenues by products and services      
Revenues 4,989 5,019 5,256
Operating Segments | Voice and Collaboration      
Operating revenues by products and services      
Revenues 3,621 3,766 4,091
Operating Segments | IT and Managed Services      
Operating revenues by products and services      
Revenues 479 535 625
Operating Segments | Broadband      
Operating revenues by products and services      
Revenues 2,909 2,876 2,824
Operating Segments | Voice      
Operating revenues by products and services      
Revenues 1,622 1,837 2,127
Operating Segments | Regulatory      
Operating revenues by products and services      
Revenues 615 632 727
Operating Segments | Other      
Operating revenues by products and services      
Revenues 105 172 316
Operating Segments | International and Global Accounts      
Operating revenues by products and services      
Revenues 3,405 3,476 3,543
Cost of services and products 935 920 940
Selling, general and administrative 242 261 249
Less: share-based compensation 0 0 0
Total expense 1,177 1,181 1,189
Total segment adjusted EBITDA 2,228 2,295 2,354
Operating Segments | International and Global Accounts | IP and Data Services      
Operating revenues by products and services      
Revenues 1,556 1,627 1,682
Operating Segments | International and Global Accounts | Transport and Infrastructure      
Operating revenues by products and services      
Revenues 1,265 1,268 1,230
Operating Segments | International and Global Accounts | Voice and Collaboration      
Operating revenues by products and services      
Revenues 368 354 365
Operating Segments | International and Global Accounts | IT and Managed Services      
Operating revenues by products and services      
Revenues 216 227 266
Operating Segments | International and Global Accounts | Broadband      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | International and Global Accounts | Voice      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | International and Global Accounts | Regulatory      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | International and Global Accounts | Other      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | Enterprise      
Operating revenues by products and services      
Revenues 5,722 5,696 5,765
Cost of services and products 1,878 1,768 1,844
Selling, general and administrative 510 545 567
Less: share-based compensation 0 0 0
Total expense 2,388 2,313 2,411
Total segment adjusted EBITDA 3,334 3,383 3,354
Operating Segments | Enterprise | IP and Data Services      
Operating revenues by products and services      
Revenues 2,474 2,538 2,485
Operating Segments | Enterprise | Transport and Infrastructure      
Operating revenues by products and services      
Revenues 1,608 1,479 1,484
Operating Segments | Enterprise | Voice and Collaboration      
Operating revenues by products and services      
Revenues 1,424 1,423 1,495
Operating Segments | Enterprise | IT and Managed Services      
Operating revenues by products and services      
Revenues 216 256 301
Operating Segments | Enterprise | Broadband      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | Enterprise | Voice      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | Enterprise | Regulatory      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | Enterprise | Other      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | Small and Medium Business      
Operating revenues by products and services      
Revenues 2,557 2,727 2,918
Cost of services and products 382 399 416
Selling, general and administrative 406 459 490
Less: share-based compensation 0 0 0
Total expense 788 858 906
Total segment adjusted EBITDA 1,769 1,869 2,012
Operating Segments | Small and Medium Business | IP and Data Services      
Operating revenues by products and services      
Revenues 1,062 1,091 1,078
Operating Segments | Small and Medium Business | Transport and Infrastructure      
Operating revenues by products and services      
Revenues 352 365 424
Operating Segments | Small and Medium Business | Voice and Collaboration      
Operating revenues by products and services      
Revenues 1,098 1,226 1,366
Operating Segments | Small and Medium Business | IT and Managed Services      
Operating revenues by products and services      
Revenues 45 45 50
Operating Segments | Small and Medium Business | Broadband      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | Small and Medium Business | Voice      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | Small and Medium Business | Regulatory      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | Small and Medium Business | Other      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | Wholesale      
Operating revenues by products and services      
Revenues 3,777 4,042 4,360
Cost of services and products 489 535 567
Selling, general and administrative 67 58 62
Less: share-based compensation 0 0 0
Total expense 556 593 629
Total segment adjusted EBITDA 3,221 3,449 3,731
Operating Segments | Wholesale | IP and Data Services      
Operating revenues by products and services      
Revenues 1,280 1,365 1,369
Operating Segments | Wholesale | Transport and Infrastructure      
Operating revenues by products and services      
Revenues 1,764 1,907 2,118
Operating Segments | Wholesale | Voice and Collaboration      
Operating revenues by products and services      
Revenues 731 763 865
Operating Segments | Wholesale | IT and Managed Services      
Operating revenues by products and services      
Revenues 2 7 8
Operating Segments | Wholesale | Broadband      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | Wholesale | Voice      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | Wholesale | Regulatory      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | Wholesale | Other      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | Consumer      
Operating revenues by products and services      
Revenues 5,251 5,517 5,994
Cost of services and products 173 197 356
Selling, general and administrative 466 521 617
Less: share-based compensation 0 0 0
Total expense 639 718 973
Total segment adjusted EBITDA 4,612 4,799 5,021
Operating Segments | Consumer | IP and Data Services      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | Consumer | Transport and Infrastructure      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | Consumer | Voice and Collaboration      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | Consumer | IT and Managed Services      
Operating revenues by products and services      
Revenues 0 0 0
Operating Segments | Consumer | Broadband      
Operating revenues by products and services      
Revenues 2,909 2,876 2,824
Operating Segments | Consumer | Voice      
Operating revenues by products and services      
Revenues 1,622 1,837 2,127
Operating Segments | Consumer | Regulatory      
Operating revenues by products and services      
Revenues 615 632 727
Operating Segments | Consumer | Other      
Operating revenues by products and services      
Revenues 105 172 316
Segment Reconciling Items      
Operating revenues by products and services      
Revenues 0 0 0
Cost of services and products 5,077 5,315 5,876
Selling, general and administrative 1,773 1,871 2,180
Less: share-based compensation (175) (162) (186)
Total expense 6,675 7,024 7,870
Total segment adjusted EBITDA (6,675) (7,024) (7,870)
Segment Reconciling Items | IP and Data Services      
Operating revenues by products and services      
Revenues 0 0 0
Segment Reconciling Items | Transport and Infrastructure      
Operating revenues by products and services      
Revenues 0 0 0
Segment Reconciling Items | Voice and Collaboration      
Operating revenues by products and services      
Revenues 0 0 0
Segment Reconciling Items | IT and Managed Services      
Operating revenues by products and services      
Revenues 0 0 0
Segment Reconciling Items | Broadband      
Operating revenues by products and services      
Revenues 0 0 0
Segment Reconciling Items | Voice      
Operating revenues by products and services      
Revenues 0 0 0
Segment Reconciling Items | Regulatory      
Operating revenues by products and services      
Revenues 0 0 0
Segment Reconciling Items | Other      
Operating revenues by products and services      
Revenues $ 0 $ 0 $ 0