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Unvested Restricted Stock Units Activity (Detail) (Restricted Stock Units (RSUs), USD $)
12 Months Ended
Dec. 31, 2012
Restricted Stock Units (RSUs)
 
Unvested restricted stock units - number of shares  
Unvested at December 31, 2011 8,822,648
Granted 6,704,261 [1]
Vested (3,884,811)
Forfeited/canceled (647,171)
Unvested at December 31, 2012 10,994,927
Expected to vest after December 31, 2012 9,547,995 [2]
Unvested restricted stock units - weighted-average grant-date fair value  
Unvested at December 31, 2011 $ 520.27
Granted $ 603.57 [1]
Vested $ 530.15
Forfeited/canceled $ 543.04
Unvested at December 31, 2012 $ 566.32
Expected to vest after December 31, 2012 $ 566.32 [2]
[1] Includes RSUs granted in connection with the acquisition of Motorola.
[2] RSUs expected to vest reflect an estimated forfeiture rate.