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Changes in Carrying Amount of Wireless Licenses (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Wireless Licenses
Indefinite-lived Intangible Assets [Line Items]      
Balance at January 1, 2013 $ 76,503 $ 77,744 $ 77,744
Acquisitions (Note 2)     574
Dispositions (Note 2)     (2,338)
Capitalized interest on wireless licenses     419
Reclassifications, adjustments and other     104
Balance at September 30, 2013 $ 76,503 $ 77,744 $ 76,503