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 |