Changes in Carrying Amount of Wireless Licenses (Detail) $ in Millions |
3 Months Ended |
|---|---|
|
Mar. 31, 2017
USD ($)
| |
| Indefinite-lived Intangible Assets [Line Items] | |
| Beginning balance | $ 86,673 |
| Ending balance | 87,754 |
| Wireless Licenses | |
| Indefinite-lived Intangible Assets [Line Items] | |
| Beginning balance | 86,673 |
| Acquisitions (Note 2) | 76 |
| Capitalized interest on wireless licenses | 121 |
| Reclassifications, adjustments and other | 884 |
| Ending balance | $ 87,754 |