v3.7.0.1
Segment Information - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Segment
Jun. 30, 2016
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments | Segment     2  
Segment reporting information, revenue $ 30,548 $ 30,532 $ 60,362 $ 62,703
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 and six months ended June 30, 2017 and 2016.  
Wireline        
Segment Reporting Information [Line Items]        
Segment reporting information, revenue 7,802 7,713 $ 15,570 15,527
Fios revenues | Wireline        
Segment Reporting Information [Line Items]        
Segment reporting information, revenue $ 2,900 $ 2,800 $ 5,800 $ 5,500