Changes in Carrying Amount of Wireless Licenses (Detail) $ in Millions |
6 Months Ended |
|---|---|
|
Jun. 30, 2017
USD ($)
| |
| Indefinite-lived Intangible Assets [Line Items] | |
| Beginning balance | $ 86,673 |
| Ending balance | 88,004 |
| Wireless Licenses | |
| Indefinite-lived Intangible Assets [Line Items] | |
| Beginning balance | 86,673 |
| Acquisitions (Note 2) | 76 |
| Capitalized interest on wireless licenses | 239 |
| Reclassifications, adjustments and other | 1,016 |
| Ending balance | $ 88,004 |