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Stock Option Activity (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Year
Options Outstanding - Number of Shares  
Balance at December 31, 2010 11,525,422
Granted 718,091
Exercised (2,181,355)
Forfeited/canceled (254,906)
Balance at December 31, 2011 9,807,252
Vested and exercisable as of December 31, 2011 6,244,783
Vested and exercisable as of December 31, 2011 and expected to vest thereafter 9,437,288 [1]
Options Outstanding - Weighted-Average Exercise Price  
Balance at December 31, 2010 $ 330.24
Granted $ 584.80
Exercised $ 284.00
Forfeited/canceled $ 377.73
Balance at December 31, 2011 $ 357.92
Vested and exercisable as of December 31, 2011 $ 314.38
Vested and exercisable as of December 31, 2011 and expected to vest thereafter $ 354.92 [1]
Options Outstanding - Weighted-Average Remaining Contractual Term (in years)  
Balance at December 31, 2011 5.7
Vested and exercisable as of December 31, 2011 5.4
Vested and exercisable as of December 31, 2011 and expected to vest thereafter 5.7 [1]
Options Outstanding - Average Intrinsic Value  
Balance at December 31, 2011 $ 2,825 [2]
Vested and exercisable as of December 31, 2011 2,070 [2]
Vested and exercisable as of December 31, 2011 and expected to vest thereafter $ 2,746 [1],[2]
[1] Options expected to vest reflect an estimated forfeiture rate.
[2] The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the closing stock price of $645.90 of our Class A common stock on December 31, 2011.