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Segment Information (Summary Of Operating Revenues And Expenses) (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2018
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]          
Number of Reportable Segments     4    
Goodwill   $ 146,475 $ 146,475   $ 105,449
Amortization of production costs     1,608 $ 0  
Business Solutions [Member]          
Segment Reporting Information [Line Items]          
Goodwill   (27,568) (27,568)    
Consumer Mobility [Member]          
Segment Reporting Information [Line Items]          
Goodwill   (16,540) (16,540)    
Mobility [Member] | Business Solutions [Member]          
Segment Reporting Information [Line Items]          
Goodwill   27,568 27,568    
Mobility [Member] | Consumer Mobility [Member]          
Segment Reporting Information [Line Items]          
Goodwill   16,540 16,540    
WarnerMedia [Member]          
Segment Reporting Information [Line Items]          
Business Acquisition, Effective Date of Acquisition Jun. 14, 2018        
WarnerMedia [Member] | Content Production Costs [Member]          
Segment Reporting Information [Line Items]          
Amortization of production costs   1,491 1,677    
WarnerMedia [Member] | Pre-Acquisition Released Programming Costs [Member]          
Segment Reporting Information [Line Items]          
Amortization of production costs   $ 772 $ 870