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Revenue Recognition (Revenue Categories) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Total Operating Revenues $ 45,739 $ 39,668 $ 122,763 $ 118,870
Wireless service        
Total Operating Revenues 14,352   42,173  
Advanced Data        
Total Operating Revenues 5,104   15,072  
Legacy Voice and Data        
Total Operating Revenues 3,355   10,493  
Subscription        
Total Operating Revenues 12,403   31,473  
Content        
Total Operating Revenues 2,716   2,937  
Advertising        
Total Operating Revenues 1,505   2,558  
Other        
Total Operating Revenues 1,862   5,143  
Equipment        
Total Operating Revenues 4,442   12,914  
Corporate and Other [Member]        
Total Operating Revenues 308   961  
Corporate and Other [Member] | Wireless service        
Total Operating Revenues 0   0  
Corporate and Other [Member] | Advanced Data        
Total Operating Revenues 0   0  
Corporate and Other [Member] | Legacy Voice and Data        
Total Operating Revenues 0   0  
Corporate and Other [Member] | Subscription        
Total Operating Revenues 0   0  
Corporate and Other [Member] | Content        
Total Operating Revenues 0   0  
Corporate and Other [Member] | Advertising        
Total Operating Revenues 0   0  
Corporate and Other [Member] | Other        
Total Operating Revenues 308   961  
Corporate and Other [Member] | Equipment        
Total Operating Revenues 0   0  
Operating Segments [Member] | Communications [Member]        
Total Operating Revenues 36,230 37,115 107,173 111,268
Operating Segments [Member] | Mobility [Member]        
Total Operating Revenues 17,938 17,370 52,575 51,922
Operating Segments [Member] | Mobility [Member] | Wireless service        
Total Operating Revenues 13,912   40,912  
Operating Segments [Member] | Mobility [Member] | Advanced Data        
Total Operating Revenues 0   0  
Operating Segments [Member] | Mobility [Member] | Legacy Voice and Data        
Total Operating Revenues 0   0  
Operating Segments [Member] | Mobility [Member] | Subscription        
Total Operating Revenues 0   0  
Operating Segments [Member] | Mobility [Member] | Content        
Total Operating Revenues 0   0  
Operating Segments [Member] | Mobility [Member] | Advertising        
Total Operating Revenues 77   162  
Operating Segments [Member] | Mobility [Member] | Other        
Total Operating Revenues 0   0  
Operating Segments [Member] | Mobility [Member] | Equipment        
Total Operating Revenues 3,949   11,501  
Operating Segments [Member] | Entertainment Group [Member]        
Total Operating Revenues 11,589 12,467 34,498 37,435
Operating Segments [Member] | Entertainment Group [Member] | Wireless service        
Total Operating Revenues 0   0  
Operating Segments [Member] | Entertainment Group [Member] | Advanced Data        
Total Operating Revenues 2,045   5,904  
Operating Segments [Member] | Entertainment Group [Member] | Legacy Voice and Data        
Total Operating Revenues 740   2,317  
Operating Segments [Member] | Entertainment Group [Member] | Subscription        
Total Operating Revenues 7,882   23,559  
Operating Segments [Member] | Entertainment Group [Member] | Content        
Total Operating Revenues 0   0  
Operating Segments [Member] | Entertainment Group [Member] | Advertising        
Total Operating Revenues 401   1,122  
Operating Segments [Member] | Entertainment Group [Member] | Other        
Total Operating Revenues 518   1,588  
Operating Segments [Member] | Entertainment Group [Member] | Equipment        
Total Operating Revenues 3   8  
Operating Segments [Member] | Business Wireline [Member]        
Total Operating Revenues 6,703 7,278 20,100 21,911
Operating Segments [Member] | Business Wireline [Member] | Wireless service        
Total Operating Revenues 0   0  
Operating Segments [Member] | Business Wireline [Member] | Advanced Data        
Total Operating Revenues 3,059   9,168  
Operating Segments [Member] | Business Wireline [Member] | Legacy Voice and Data        
Total Operating Revenues 2,615   8,176  
Operating Segments [Member] | Business Wireline [Member] | Subscription        
Total Operating Revenues 0   0  
Operating Segments [Member] | Business Wireline [Member] | Content        
Total Operating Revenues 0   0  
Operating Segments [Member] | Business Wireline [Member] | Advertising        
Total Operating Revenues 0   0  
Operating Segments [Member] | Business Wireline [Member] | Other        
Total Operating Revenues 830   2,189  
Operating Segments [Member] | Business Wireline [Member] | Equipment        
Total Operating Revenues 199   567  
Operating Segments [Member] | WarnerMedia [Member]        
Total Operating Revenues 8,204 107 9,709 323
Operating Segments [Member] | Turner [Member]        
Total Operating Revenues 2,988 107 3,767 323
Operating Segments [Member] | Turner [Member] | Wireless service        
Total Operating Revenues 0   0  
Operating Segments [Member] | Turner [Member] | Advanced Data        
Total Operating Revenues 0   0  
Operating Segments [Member] | Turner [Member] | Legacy Voice and Data        
Total Operating Revenues 0   0  
Operating Segments [Member] | Turner [Member] | Subscription        
Total Operating Revenues 1,855   2,363  
Operating Segments [Member] | Turner [Member] | Content        
Total Operating Revenues 125   146  
Operating Segments [Member] | Turner [Member] | Advertising        
Total Operating Revenues 944   1,181  
Operating Segments [Member] | Turner [Member] | Other        
Total Operating Revenues 64   77  
Operating Segments [Member] | Turner [Member] | Equipment        
Total Operating Revenues 0   0  
Operating Segments [Member] | Home Box Office [Member]        
Total Operating Revenues 1,644 0 1,925 0
Operating Segments [Member] | Home Box Office [Member] | Wireless service        
Total Operating Revenues 0   0  
Operating Segments [Member] | Home Box Office [Member] | Advanced Data        
Total Operating Revenues 0   0  
Operating Segments [Member] | Home Box Office [Member] | Legacy Voice and Data        
Total Operating Revenues 0   0  
Operating Segments [Member] | Home Box Office [Member] | Subscription        
Total Operating Revenues 1,517   1,787  
Operating Segments [Member] | Home Box Office [Member] | Content        
Total Operating Revenues 125   136  
Operating Segments [Member] | Home Box Office [Member] | Advertising        
Total Operating Revenues 0   0  
Operating Segments [Member] | Home Box Office [Member] | Other        
Total Operating Revenues 2   2  
Operating Segments [Member] | Home Box Office [Member] | Equipment        
Total Operating Revenues 0   0  
Operating Segments [Member] | Warner Bros. [Member]        
Total Operating Revenues 3,720 0 4,227 0
Operating Segments [Member] | Warner Bros. [Member] | Wireless service        
Total Operating Revenues 0   0  
Operating Segments [Member] | Warner Bros. [Member] | Advanced Data        
Total Operating Revenues 0   0  
Operating Segments [Member] | Warner Bros. [Member] | Legacy Voice and Data        
Total Operating Revenues 0   0  
Operating Segments [Member] | Warner Bros. [Member] | Subscription        
Total Operating Revenues 20   27  
Operating Segments [Member] | Warner Bros. [Member] | Content        
Total Operating Revenues 3,494   3,949  
Operating Segments [Member] | Warner Bros. [Member] | Advertising        
Total Operating Revenues 20   28  
Operating Segments [Member] | Warner Bros. [Member] | Other        
Total Operating Revenues 186   223  
Operating Segments [Member] | Warner Bros. [Member] | Equipment        
Total Operating Revenues 0   0  
Operating Segments [Member] | Eliminations and other [Member]        
Total Operating Revenues (148)   (210)  
Operating Segments [Member] | Eliminations and other [Member] | Wireless service        
Total Operating Revenues 0   0  
Operating Segments [Member] | Eliminations and other [Member] | Advanced Data        
Total Operating Revenues 0   0  
Operating Segments [Member] | Eliminations and other [Member] | Legacy Voice and Data        
Total Operating Revenues 0   0  
Operating Segments [Member] | Eliminations and other [Member] | Subscription        
Total Operating Revenues 27   27  
Operating Segments [Member] | Eliminations and other [Member] | Content        
Total Operating Revenues (199)   (255)  
Operating Segments [Member] | Eliminations and other [Member] | Advertising        
Total Operating Revenues 19   13  
Operating Segments [Member] | Eliminations and other [Member] | Other        
Total Operating Revenues 5   5  
Operating Segments [Member] | Eliminations and other [Member] | Equipment        
Total Operating Revenues 0   0  
Operating Segments [Member] | Latin America [Member]        
Total Operating Revenues 1,833 2,099 5,809 6,054
Operating Segments [Member] | Vrio [Member]        
Total Operating Revenues 1,102 1,363 3,710 4,065
Operating Segments [Member] | Vrio [Member] | Wireless service        
Total Operating Revenues 0   0  
Operating Segments [Member] | Vrio [Member] | Advanced Data        
Total Operating Revenues 0   0  
Operating Segments [Member] | Vrio [Member] | Legacy Voice and Data        
Total Operating Revenues 0   0  
Operating Segments [Member] | Vrio [Member] | Subscription        
Total Operating Revenues 1,102   3,710  
Operating Segments [Member] | Vrio [Member] | Content        
Total Operating Revenues 0   0  
Operating Segments [Member] | Vrio [Member] | Advertising        
Total Operating Revenues 0   0  
Operating Segments [Member] | Vrio [Member] | Other        
Total Operating Revenues 0   0  
Operating Segments [Member] | Vrio [Member] | Equipment        
Total Operating Revenues 0   0  
Operating Segments [Member] | Mexico [Member]        
Total Operating Revenues 731 736 2,099 1,989
Operating Segments [Member] | Mexico [Member] | Wireless service        
Total Operating Revenues 440   1,261  
Operating Segments [Member] | Mexico [Member] | Advanced Data        
Total Operating Revenues 0   0  
Operating Segments [Member] | Mexico [Member] | Legacy Voice and Data        
Total Operating Revenues 0   0  
Operating Segments [Member] | Mexico [Member] | Subscription        
Total Operating Revenues 0   0  
Operating Segments [Member] | Mexico [Member] | Content        
Total Operating Revenues 0   0  
Operating Segments [Member] | Mexico [Member] | Advertising        
Total Operating Revenues 0   0  
Operating Segments [Member] | Mexico [Member] | Other        
Total Operating Revenues 0   0  
Operating Segments [Member] | Mexico [Member] | Equipment        
Total Operating Revenues 291   838  
Operating Segments [Member] | Xandr [Member]        
Total Operating Revenues 445 333 1,174 992
Operating Segments [Member] | Xandr [Member] | Wireless service        
Total Operating Revenues 0   0  
Operating Segments [Member] | Xandr [Member] | Advanced Data        
Total Operating Revenues 0   0  
Operating Segments [Member] | Xandr [Member] | Legacy Voice and Data        
Total Operating Revenues 0   0  
Operating Segments [Member] | Xandr [Member] | Subscription        
Total Operating Revenues 0   0  
Operating Segments [Member] | Xandr [Member] | Content        
Total Operating Revenues 0   0  
Operating Segments [Member] | Xandr [Member] | Advertising        
Total Operating Revenues 445   1,174  
Operating Segments [Member] | Xandr [Member] | Other        
Total Operating Revenues 0   0  
Operating Segments [Member] | Xandr [Member] | Equipment        
Total Operating Revenues 0   0  
Eliminations and consolidations [Member]        
Total Operating Revenues (1,281) $ (279) (2,063) $ (860)
Eliminations and consolidations [Member] | Wireless service        
Total Operating Revenues 0   0  
Eliminations and consolidations [Member] | Advanced Data        
Total Operating Revenues 0   0  
Eliminations and consolidations [Member] | Legacy Voice and Data        
Total Operating Revenues 0   0  
Eliminations and consolidations [Member] | Subscription        
Total Operating Revenues 0   0  
Eliminations and consolidations [Member] | Content        
Total Operating Revenues (829)   (1,039)  
Eliminations and consolidations [Member] | Advertising        
Total Operating Revenues (401)   (1,122)  
Eliminations and consolidations [Member] | Other        
Total Operating Revenues (51)   98  
Eliminations and consolidations [Member] | Equipment        
Total Operating Revenues $ 0   $ 0