Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2011

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following table presents the weighted-average assumptions used to estimate the fair values of the stock options granted (excluding options granted in connection with the Exchange discussed below) in the periods presented:

	Year Ended December 31,
	2009			2010			2011
Risk-free interest rate		2.6	%		1.9	%		2.3	%
Expected volatility		37	%		35	%		33	%
Expected life (in years)		5.8			5.4			5.9
Dividend yield		0			0			0
Weighted-average estimated fair value of options granted during the year	$	160.63		$	216.43		$	210.07

Schedule of Share-based Compensation, Stock Options, Activity

The following table summarizes the activities for our options for the year ended December 31, 2011:

	Options Outstanding
	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in  millions)(1)
Balance at December 31, 2010		11,525,422		$	330.24
Granted		718,091		$	584.80
Exercised		(2,181,355	)	$	284.00
Forfeited/canceled		(254,906	)	$	377.73
Balance at December 31, 2011		9,807,252		$	357.92		5.7	$	2,825
Vested and exercisable as of December 31, 2011		6,244,783		$	314.38		5.4	$	2,070
Vested and exercisable as of December 31, 2011 and expected to vest thereafter(2)		9,437,288		$	354.92		5.7	$	2,746

⁽¹⁾  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.

⁽²⁾  Options expected to vest reflect an estimated forfeiture rate.

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range

The following table summarizes additional information regarding outstanding, exercisable, and exercisable and vested stock options at December 31, 2011:

	Options Outstanding						Options Exercisable				Options Exercisable and Vested
Range of Exercise Prices	Number of Shares		Weighted- Average Remaining Life (in years)		Weighted- Average Exercise Price		Number of Shares		Weighted- Average Exercise Price		Number of Shares		Weighted- Average Exercise Price
$0.30–$94.80		297,360		2.6	$	28.06		296,392	$	27.85		278,071	$	24.73
$117.84–$198.41		412,843		2.9	$	179.12		412,843	$	179.12		412,843	$	179.12
$205.96–$298.86		505,760		3.2	$	275.21		502,038	$	275.12		502,038	$	275.12
$300.97–$399.00		5,478,754		5.0	$	309.68		4,012,895	$	309.71		4,012,895	$	309.71
$401.78–$499.07		935,944		6.6	$	439.16		514,417	$	437.28		514,417	$	437.28
$501.27–$595.35		1,892,340		8.4	$	532.44		509,780	$	524.69		509,780	$	524.69
$601.17–$699.35		284,171		9.1	$	610.18		14,659	$	612.09		14,659	$	612.09
$710.84		80		6.0	$	710.84		80	$	710.84		80	$	710.84
$0.30–$710.84		9,807,252		5.7	$	357.92		6,263,104	$	313.68		6,244,783	$	314.38

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

The following table summarizes the activities for our unvested RSUs for the year ended December 31, 2011:

	Unvested Restricted Stock Units
	Number of     Shares			Weighted- Average Grant-Date Fair Value
Unvested at December 31, 2010		6,671,971		$	509.04
Granted		5,260,421		$	531.20
Vested		(2,691,549	)	$	516.22
Forfeited/canceled		(418,195	)	$	538.01
Unvested at December 31, 2011		8,822,648		$	520.27
Expected to vest after December 31, 2011(1)		7,903,328		$	520.27

⁽¹⁾  RSUs expected to vest reflect an estimated forfeiture rate.