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 |