v3.4.0.3
Changes in Carrying Amount of Wireless Licenses (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Indefinite-lived Intangible Assets [Line Items]  
Beginning balance $ 86,575
Ending balance 86,830
Wireless Licenses  
Indefinite-lived Intangible Assets [Line Items]  
Beginning balance 86,575
Acquisitions (Note 2) 3
Capitalized interest on wireless licenses 128
Reclassifications, adjustments and other 124
Ending balance $ 86,830