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Unvested Restricted Stock Units Actvity (Detail) (Restricted Stock Units (RSUs), USD $)
6 Months Ended
Jun. 30, 2012
Restricted Stock Units (RSUs)
 
Unvested restricted stock units - number of shares  
Unvested at December 31, 2011 8,822,648
Granted 5,594,051 [1]
Vested (1,740,221)
Forfeited/canceled (307,095)
Unvested at June 30, 2012 12,369,383
Expected to vest after June 30, 2012 10,741,572 [2]
Unvested restricted stock units - weighted-average grant-date fair value  
Unvested at December 31, 2011 $ 520.27
Granted $ 516.45 [1]
Vested $ 491.76
Forfeited/canceled $ 519.09
Unvested at June 30, 2012 $ 522.56
Expected to vest after June 30, 2012 $ 522.56 [2]
[1] Includes RSUs granted in connection with the acquisition of Motorola.
[2] RSUs expected to vest reflect an estimated forfeiture rate.