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Acquisitions, Dispositions And Other Adjustments (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended
Aug. 31, 2018
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Jun. 14, 2018
Dec. 31, 2017
Acquisition and Dispositions [Line Items]            
Advances, Investments In, Collections, and Payments From Affiliates     $ 1,021 $ 0    
Goodwill     146,475     $ 105,449
Acquisition of business - purchase price (in millions)     43,116 $ (1,154)    
Time Warner Inc. [Member]            
Acquisition and Dispositions [Line Items]            
Goodwill     38,955      
Time Warner Inc. [Member] | Acquisition [Member]            
Acquisition and Dispositions [Line Items]            
Acquisition of business - acquisition period   Jun. 14, 2018        
Acquisition of business - purchase price (in millions)   $ 79,358        
Acquisition of business - percentage ownership of combined company held by former shareholders of acquiree         16.00%  
Stock price per share at period end         $ 32.52  
Name of Plaintiff   Department of Justice        
Actions Taken by Plaintiff   On July 12, 2018, the U.S. Department of Justice (DOJ) appealed the U.S. District Court’s decision permitting the merger.        
Commitments for future purchases related to network programming obligations         $ 35,000  
Time Warner Inc. [Member] | Acquisition [Member] | Cash [Member]            
Acquisition and Dispositions [Line Items]            
Acquisition of business - purchase price (in US dollars per share)   $ 53.75        
Acquisition of business - purchase price (in millions)   $ 42,100        
Time Warner Inc. [Member] | Acquisition [Member] | Common Stock [Member]            
Acquisition and Dispositions [Line Items]            
Acquisition of business - noncash consideration to be given   1.437 shares of AT&T stock per share of Time Warner common stock        
Number of shares issued to acquire entity   1,125,517,510        
Acquisition of business - purchase price (in millions)   $ 36,599        
Otter Media [Member] | Acquisition [Member]            
Acquisition and Dispositions [Line Items]            
Acquisition of business - acquisition period Aug. 07, 2018          
Advances, Investments In, Collections, and Payments From Affiliates $ 1,480          
Acquisition of business - Equity Interest in Acquiree Remeasurement Gain 395          
Acquisition of business - purchase price (in millions) $ 157          
WarnerMedia [Member] | Acquisition [Member]            
Acquisition and Dispositions [Line Items]            
Goodwill     1,174      
AppNexus [Member] | Acquisition [Member]            
Acquisition and Dispositions [Line Items]            
Acquisition of business - acquisition period Aug. 15, 2018          
Acquisition of business - purchase price (in millions) $ 1,432          
Xandr [Member] | Acquisition [Member]            
Acquisition and Dispositions [Line Items]            
Goodwill     $ 1,223