v3.7.0.1
Segment Information - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Segment
Mar. 31, 2016
USD ($)
Segment Reporting Information [Line Items]    
Number of reportable segments | Segment 2  
Segment reporting information, revenue $ 29,814 $ 32,171
Number of customers individually accounting for more than ten percent of total operating revenues No single customer accounted for more than 10% of our total operating revenues during the three months ended March 31, 2017 and 2016.  
Wireline    
Segment Reporting Information [Line Items]    
Segment reporting information, revenue $ 7,876 7,923
Fios revenues | Wireline    
Segment Reporting Information [Line Items]    
Segment reporting information, revenue $ 2,900 $ 2,800