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Revenue Recognition (Revenue Categories) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Total Operating Revenues $ 44,588 $ 45,739 $ 134,372 $ 122,763
Wireless service        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 14,435 14,352 42,984 42,173
Advanced Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 5,399 5,111 15,985 15,044
Legacy Voice and Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 2,886 3,348 8,962 10,521
Subscription        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 12,065 12,403 36,429 31,473
Content        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 2,317 2,715 7,375 2,937
Advertising        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 1,523 1,505 5,136 2,558
Other        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 1,692 1,863 5,153 5,143
Equipment        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 4,271 4,442 12,348 12,914
Corporate and Other [Member]        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 407 531 1,218 1,636
Corporate and Other [Member] | Wireless service        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 124 161 437 480
Corporate and Other [Member] | Advanced Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 13 13 40 39
Corporate and Other [Member] | Legacy Voice and Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 6 7 20 28
Corporate and Other [Member] | Subscription        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Corporate and Other [Member] | Content        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Corporate and Other [Member] | Advertising        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Corporate and Other [Member] | Other        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 227 307 605 958
Corporate and Other [Member] | Equipment        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 37 43 116 131
Operating Segments [Member]        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 45,481 46,489 137,032 123,190
Operating Segments [Member] | Communications [Member]        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 35,401 36,007 105,837 106,498
Operating Segments [Member] | Communications [Member] | Mobility [Member]        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 17,701 17,735 52,356 51,965
Operating Segments [Member] | Communications [Member] | Mobility [Member] | Wireless service        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 13,856 13,751 41,171 40,432
Operating Segments [Member] | Communications [Member] | Mobility [Member] | Advanced Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Communications [Member] | Mobility [Member] | Legacy Voice and Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Communications [Member] | Mobility [Member] | Subscription        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Communications [Member] | Mobility [Member] | Content        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Communications [Member] | Mobility [Member] | Advertising        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 74 77 212 162
Operating Segments [Member] | Communications [Member] | Mobility [Member] | Other        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Communications [Member] | Mobility [Member] | Equipment        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 3,771 3,907 10,973 11,371
Operating Segments [Member] | Communications [Member] | Entertainment Group [Member]        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 11,197 11,589 33,893 34,498
Operating Segments [Member] | Communications [Member] | Entertainment Group [Member] | Wireless service        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Communications [Member] | Entertainment Group [Member] | Advanced Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 2,117 2,045 6,296 5,904
Operating Segments [Member] | Communications [Member] | Entertainment Group [Member] | Legacy Voice and Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 628 739 1,969 2,317
Operating Segments [Member] | Communications [Member] | Entertainment Group [Member] | Subscription        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 7,512 7,882 22,872 23,559
Operating Segments [Member] | Communications [Member] | Entertainment Group [Member] | Content        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Communications [Member] | Entertainment Group [Member] | Advertising        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 421 401 1,170 1,122
Operating Segments [Member] | Communications [Member] | Entertainment Group [Member] | Other        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 517 518 1,580 1,588
Operating Segments [Member] | Communications [Member] | Entertainment Group [Member] | Equipment        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 2 4 6 8
Operating Segments [Member] | Communications [Member] | Business Wireline [Member]        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 6,503 6,683 19,588 20,035
Operating Segments [Member] | Communications [Member] | Business Wireline [Member] | Wireless service        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Communications [Member] | Business Wireline [Member] | Advanced Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 3,269 3,053 9,649 9,101
Operating Segments [Member] | Communications [Member] | Business Wireline [Member] | Legacy Voice and Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 2,252 2,602 6,973 8,176
Operating Segments [Member] | Communications [Member] | Business Wireline [Member] | Subscription        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Communications [Member] | Business Wireline [Member] | Content        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Communications [Member] | Business Wireline [Member] | Advertising        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Communications [Member] | Business Wireline [Member] | Other        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 783 831 2,430 2,192
Operating Segments [Member] | Communications [Member] | Business Wireline [Member] | Equipment        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 199 197 536 566
Operating Segments [Member] | WarnerMedia [Member]        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 7,846 8,204 24,575 9,709
Operating Segments [Member] | WarnerMedia [Member] | Turner [Member]        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 3,007 2,988 9,860 3,767
Operating Segments [Member] | WarnerMedia [Member] | Turner [Member] | Wireless service        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | WarnerMedia [Member] | Turner [Member] | Advanced Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | WarnerMedia [Member] | Turner [Member] | Legacy Voice and Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | WarnerMedia [Member] | Turner [Member] | Subscription        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 1,927 1,855 5,835 2,363
Operating Segments [Member] | WarnerMedia [Member] | Turner [Member] | Content        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 89 125 335 146
Operating Segments [Member] | WarnerMedia [Member] | Turner [Member] | Advertising        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 913 944 3,440 1,181
Operating Segments [Member] | WarnerMedia [Member] | Turner [Member] | Other        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 78 64 250 77
Operating Segments [Member] | WarnerMedia [Member] | Turner [Member] | Equipment        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | WarnerMedia [Member] | Home Box Office [Member]        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 1,819 1,644 5,045 1,925
Operating Segments [Member] | WarnerMedia [Member] | Home Box Office [Member] | Wireless service        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | WarnerMedia [Member] | Home Box Office [Member] | Advanced Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | WarnerMedia [Member] | Home Box Office [Member] | Legacy Voice and Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | WarnerMedia [Member] | Home Box Office [Member] | Subscription        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 1,533 1,517 4,383 1,787
Operating Segments [Member] | WarnerMedia [Member] | Home Box Office [Member] | Content        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 284 125 655 136
Operating Segments [Member] | WarnerMedia [Member] | Home Box Office [Member] | Advertising        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | WarnerMedia [Member] | Home Box Office [Member] | Other        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 2 2 7 2
Operating Segments [Member] | WarnerMedia [Member] | Home Box Office [Member] | Equipment        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | WarnerMedia [Member] | Warner Bros. [Member]        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 3,333 3,720 10,240 4,227
Operating Segments [Member] | WarnerMedia [Member] | Warner Bros. [Member] | Wireless service        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | WarnerMedia [Member] | Warner Bros. [Member] | Advanced Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | WarnerMedia [Member] | Warner Bros. [Member] | Legacy Voice and Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | WarnerMedia [Member] | Warner Bros. [Member] | Subscription        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 23 20 67 27
Operating Segments [Member] | WarnerMedia [Member] | Warner Bros. [Member] | Content        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 3,129 3,494 9,636 3,949
Operating Segments [Member] | WarnerMedia [Member] | Warner Bros. [Member] | Advertising        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 13 20 33 28
Operating Segments [Member] | WarnerMedia [Member] | Warner Bros. [Member] | Other        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 168 186 504 223
Operating Segments [Member] | WarnerMedia [Member] | Warner Bros. [Member] | Equipment        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | WarnerMedia [Member] | Eliminations and other [Member]        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues (313) (148) (570) (210)
Operating Segments [Member] | WarnerMedia [Member] | Eliminations and other [Member] | Wireless service        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | WarnerMedia [Member] | Eliminations and other [Member] | Advanced Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | WarnerMedia [Member] | Eliminations and other [Member] | Legacy Voice and Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | WarnerMedia [Member] | Eliminations and other [Member] | Subscription        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 57 27 160 27
Operating Segments [Member] | WarnerMedia [Member] | Eliminations and other [Member] | Content        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues (387) (199) (776) (255)
Operating Segments [Member] | WarnerMedia [Member] | Eliminations and other [Member] | Advertising        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 19 19 36 13
Operating Segments [Member] | WarnerMedia [Member] | Eliminations and other [Member] | Other        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues (2) 5 10 5
Operating Segments [Member] | WarnerMedia [Member] | Eliminations and other [Member] | Equipment        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Latin America [Member]        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 1,730 1,833 5,205 5,809
Operating Segments [Member] | Latin America [Member] | Vrio [Member]        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 1,013 1,102 3,112 3,710
Operating Segments [Member] | Latin America [Member] | Vrio [Member] | Wireless service        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Latin America [Member] | Vrio [Member] | Advanced Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Latin America [Member] | Vrio [Member] | Legacy Voice and Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Latin America [Member] | Vrio [Member] | Subscription        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 1,013 1,102 3,112 3,710
Operating Segments [Member] | Latin America [Member] | Vrio [Member] | Content        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Latin America [Member] | Vrio [Member] | Advertising        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Latin America [Member] | Vrio [Member] | Other        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Latin America [Member] | Vrio [Member] | Equipment        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Latin America [Member] | Mexico [Member]        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 717 731 2,093 2,099
Operating Segments [Member] | Latin America [Member] | Mexico [Member] | Wireless service        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 455 440 1,376 1,261
Operating Segments [Member] | Latin America [Member] | Mexico [Member] | Advanced Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Latin America [Member] | Mexico [Member] | Legacy Voice and Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Latin America [Member] | Mexico [Member] | Subscription        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Latin America [Member] | Mexico [Member] | Content        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Latin America [Member] | Mexico [Member] | Advertising        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Latin America [Member] | Mexico [Member] | Other        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Latin America [Member] | Mexico [Member] | Equipment        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 262 291 717 838
Operating Segments [Member] | Xandr [Member]        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 504 445 1,415 1,174
Operating Segments [Member] | Xandr [Member] | Wireless service        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Xandr [Member] | Advanced Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Xandr [Member] | Legacy Voice and Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Xandr [Member] | Subscription        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Xandr [Member] | Content        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Xandr [Member] | Advertising        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 504 445 1,415 1,174
Operating Segments [Member] | Xandr [Member] | Other        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Operating Segments [Member] | Xandr [Member] | Equipment        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0 0 0 0
Eliminations and consolidations [Member]        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues (1,300) (1,281) (3,878) (2,063)
Eliminations and consolidations [Member] | Wireless service        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues   0 0 0
Eliminations and consolidations [Member] | Advanced Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues   0 0 0
Eliminations and consolidations [Member] | Legacy Voice and Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues   0 0 0
Eliminations and consolidations [Member] | Subscription        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues   0 0 0
Eliminations and consolidations [Member] | Content        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues   (830) (2,475) (1,039)
Eliminations and consolidations [Member] | Advertising        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues   (401) (1,170) (1,122)
Eliminations and consolidations [Member] | Other        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues   (50) (233) 98
Eliminations and consolidations [Member] | Equipment        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues   $ 0 $ 0 $ 0
Eliminations and consolidations [Member] | Eliminations and other [Member]        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues (1,300)      
Eliminations and consolidations [Member] | Eliminations and other [Member] | Wireless service        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0      
Eliminations and consolidations [Member] | Eliminations and other [Member] | Advanced Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0      
Eliminations and consolidations [Member] | Eliminations and other [Member] | Legacy Voice and Data        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0      
Eliminations and consolidations [Member] | Eliminations and other [Member] | Subscription        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 0      
Eliminations and consolidations [Member] | Eliminations and other [Member] | Content        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues (798)      
Eliminations and consolidations [Member] | Eliminations and other [Member] | Advertising        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues (421)      
Eliminations and consolidations [Member] | Eliminations and other [Member] | Other        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues (81)      
Eliminations and consolidations [Member] | Eliminations and other [Member] | Equipment        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues $ 0